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Psychology is analytic self- assessment designed to help us to heal ourselves, and know ourselves better leading us to a more conscious, happier, healthier life.

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Learning to Love and Everyone Unconditionally,
Especially Yourself.

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Psychology is the use of different modalities to help the person understand why their life is how it is and to help them to move forward in a healthier way. To help them change what isn’t working for them in a loving, non-judgemental, safe space.

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the study of the way we think, behave, and process emotions.

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Cognitie and mindfulness therapy to rebuild relationships with yourself and others.

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Psychology is the study of human behavior, the mind, emotions, and relationship with self and others.

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The science of the mind and emotions.

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Psychology is about the alignment of all aspects of self so as to create a balance and modify,refine and transmute all areas that are in a state of imbalance to a state of clarity of perception and action.

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Psychology Description

* This article is updated daily from Wikipedia. It may contain minor formatting errors.
For the original content and references, click here. Last update: 8/18/2013.

Psychology is an academic and Applied science|applied discipline that involves the scientific study of mental functions and behaviors.* Psychology has the immediate goal of understanding individuals and groups by both establishing general principles and researching specific cases,* and by many accounts it ultimately aims to benefit society.* In this field, a professional Wikt:practitioner|practitioner or researcher is called a psychologist and can be classified as a Social science|social, Behavioural sciences|behavioral, or Cognitive science|cognitive scientist. Psychologists attempt to understand the role of mental functions in individual and social behavior, while also exploring the Physiology|physiological and neurobiology|neurobiological processes that underlie certain cognitive functions and behaviors.

Psychologists explore concepts such as perception, cognition, attention, emotion, phenomenology (psychology)|phenomenology, motivation, Human brain#Functions|brain functioning, personality psychology|personality, behavior, and interpersonal relationships. Psychologists of diverse stripes also consider the unconscious mind.* Psychologists employ empirical methods to infer causal and correlation and dependence|correlational relationships between psychosocial dependent and independent variables|variables. In eclecticism|addition, or in antipositivism|opposition, to employing empirical and Deductive-nomological model|deductive methods, some—especially Clinical psychology|clinical and counseling psychology|counseling psychologists—at times rely upon Hermeneutics#Psychology|symbolic interpretation and other inductive reasoning|inductive techniques. Psychology has been described as a "hub science",* with psychological findings linking to research and perspectives from the social sciences, natural sciences, medicine, and the humanities, such as philosophy.

While psychological knowledge is often applied to the psychological assessment|assessment and psychotherapy|treatment of mental health psychopathology|problems, it is also directed towards understanding and solving problems in many different spheres of Human behavior|human activity. The majority of psychologists are involved in some kind of therapeutic role, practicing in clinical, counseling psychology|counseling, or school psychology|school settings. Many do scientific research on a wide range of topics related to mental processes and behavior, and typically work in university psychology departments or teach in other academic settings (e.g., medical schools, hospitals). Some are employed in industrial and organizational psychology|industrial and organizational settings, or in other areas* such as developmental psychology|human development and aging, sport psychology|sports, health psychology|health, and media psychology|the media, as well as in forensic psychology|forensic investigation and other aspects of legal psychology|law.


The word psychology literally means, "study of the soul (spirit)|soul" (wikt:?|?, psukhe, meaning "breath", "spirit", or "soul"; and -? wikt:-logos|-logos, translated as "study of" or "research"*).* The Latin word psychologia was first used by the Croatian humanism|humanist and Croatian latinistic literature|Latinist Marko Marulic in his book, Psichiologia de ratione animae humanae in the late 15th century or early 16th century.* The earliest known reference to the word psychology in English was by Steven Blankaart in 1694 in The Physical Dictionary which refers to "Anatomy, which treats of the Body, and Psychology, which treats of the Soul."*


The study of psychology in a Philosophy|philosophical context dates back to the ancient civilizations of Ancient Egypt|Egypt, Ancient Greece|Greece, History of China|China, History of India|India, and Persian Empire|Persia. Historians point to the writings of ancient Greek philosophers, such as Thales, Plato, and Aristotle (especially in his On the Soul|De Anima treatise),* as the first significant body of work in the West to be rich in psychological thought.* As early as the 4th century BC, Greek physician Hippocrates theorized that mental disorders were of a physical, rather than divine, nature.* he founded the first psychological laboratory, at Leipzig University, in 1879.* Wundt focused on breaking down mental processes into the most basic components, motivated in part by an analogy to recent advances in chemistry, and its successful investigation of the elements and structure of material. Although Wundt, himself, was not a structuralist, his student Edward Titchener, a major figure in early American psychology, was a structuralist thinker opposed to functionalist approaches.


Functionalism formed as a reaction to the theories of the structuralist school of thought and was heavily influenced by the work of the American philosopher, scientist, and psychologist William James. James felt that psychology should have practical value, and that psychologists should find out how the mind can function to a person's benefit. In his book, Principles of Psychology,* published in 1890, he laid the foundations for many of the questions that psychologists would explore for years to come. Other major functionalist thinkers included John Dewey and Harvey Carr.

Other 19th-century contributors to the field include the German psychologist Hermann Ebbinghaus, a pioneer in the experimental study of memory, who developed quantitative models of learning and forgetting at the University of Berlin,* and the Russian-Soviet physiologist Ivan Pavlov, who discovered in dogs a learning process that was later termed "classical conditioning" and applied to human beings.*Starting in the 1950s, the experimental techniques developed by Wundt, James, Ebbinghaus, and others re-emerged as experimental psychology became increasingly cognition|cognitivist—concerned with information and its information processing|processing—and, eventually, constituted a part of the wider cognitive science.* In its early years, this development was seen as a cognitive revolution|"revolution,"* as cognitive science both responded to and reacted against then-popular theories, including psychoanalytic theory|psychoanalytic and behaviorism|behaviorist theories.


From the 1890s until his death in 1939, the Austrian physician Sigmund Freud developed psychoanalysis, which comprised a method of investigating the mind and interpreting experience; a systematized set of theories about human behavior; and a form of psychotherapy to treat psychological or emotional distress, especially unconscious conflict (process)|conflict.* Freud's psychoanalytic theory was largely based on interpretive methods, introspection and clinical observations. It became very well known, largely because it tackled subjects such as Human sexuality|sexuality, psychological repression|repression, and the unconscious mind as general aspects of psychological development. These were largely considered taboo subjects at the time, and Freud provided a catalyst for them to be openly discussed in polite society. Clinically, Freud helped to pioneer the method of Free association (psychology)|free association and a therapeutic interest in dream interpretation.* Freud had a significant influence on Swiss psychiatrist Carl Jung, whose analytical psychology became an alternative form of depth psychology. Other well-known psychoanalytic scholars of the mid-20th century included psychoanalysts, psychologists, psychiatrists, and philosophers. Among these thinkers were Erik Erikson, Melanie Klein, Donald Winnicott|D.W. Winnicott, Karen Horney, Erich Fromm, John Bowlby, and Sigmund Freud's daughter, Anna Freud. Throughout the 20th century, psychoanalysis evolved into diverse schools of thought, most of which may be classed as Neo-Freudian.*Psychoanalytic theory and therapy were criticized by psychologists such as Hans Eysenck, and by philosophers including Karl Popper. Popper, a Philosophy of science|philosopher of science, argued that psychoanalysis had been misrepresented as a scientific discipline,* whereas Eysenck said that psychoanalytic tenets had been contradicted by experimental data. By the end of 20th century, psychology departments in Higher education in the United States|American universities had become positivism|scientifically oriented, marginalizing Freudian theory and dismissing it as a "desiccated and dead" historical artifact.* Meanwhile, however, researchers in the emerging field of neuro-psychoanalysis defended some of Freud's ideas on scientific grounds,* while scholars of the humanities maintained that Freud was not a "scientist at all, but ... an hermeneutics|interpreter."*


In the United States, behaviorism became the dominant school of thought during the 1950s. Behaviorism is a discipline that was established in the early 20th century by John B. Watson, and embraced and extended by Edward Thorndike, Clark L. Hull, Edward C. Tolman, and later B.F. Skinner. Theories of learning emphasized the ways in which people might be predisposed, or conditioned, by their environments to behave in certain ways.

Classical conditioning was an early behaviorist model. It posited that behavioral tendencies are determined by immediate associations between various environmental stimulus–response model|stimuli and the degree of pleasure or pain that follows. Behavioral patterns, then, were understood to consist of organisms' conditioned responses to the stimuli in their environment. The stimuli were held to exert influence in proportion to their prior repetition or to the previous intensity of their associated pain or pleasure. Much research consisted of laboratory-based animal experimentation, which was increasing in popularity as physiology grew more sophisticated.

Skinner's behaviorism shared with its predecessors a philosophical inclination toward positivism and determinism.* He believed that the contents of the mind were not open to scientific scrutiny and that scientific psychology should emphasize the study of observable behavior. He focused on behavior–environment relations and analyzed overt and covert (i.e., private) behavior as a function of the organism interacting with its environment.* Behaviorists usually rejected or deemphasized dualism (philosophy of mind)|dualistic explanations such as "mind" or "consciousness"; and, in lieu of probing an "unconscious mind" that underlies unawareness, they spoke of the "contingency-shaped behaviors" in which unawareness becomes outwardly manifest.*

Notable incidents in the history of behaviorism are John B. Watson's Little Albert experiment which applied classical conditioning to the developing human child, and the clarification of the difference between classical conditioning and Operant conditioning|operant (or instrumental) conditioning, first by Miller and Kanorski and then by Skinner.* Skinner's version of behaviorism emphasized operant conditioning, through which behaviors are strengthened or weakened by their consequences.

Linguist Noam Chomsky's critique of the behaviorist model of language acquisition is widely regarded as a key factor in the decline of behaviorism's prominence.* Martin Seligman and colleagues discovered that the conditioning of dogs led to outcomes ("learned helplessness") that opposed the predictions of behaviorism.* But Skinner's behaviorism did not die, perhaps in part because it generated successful practical applications.* The fall of behaviorism as an overarching model in psychology, however, gave way to a new dominant paradigm: cognitive approaches.*


Humanistic psychology was developed in the 1950s in reaction to both behaviorism and psychoanalysis.* By using phenomenology (psychology)|phenomenology, intersubjectivity, and first-person categories, the humanistic approach sought to glimpse the whole person—not just the fragmented parts of the personality or cognitive functioning.* Humanism focused on fundamentally and uniquely human issues, such as individual free will, personal growth, self-actualization, self-concept|self-identity, death, Loneliness#As human condition|aloneness, free will|freedom, and meaning (existential)|meaning. The humanistic approach was distinguished by its emphasis on subjective meaning, rejection of determinism, and concern for positive growth rather than pathology. Some of the founders of the humanistic school of thought were American psychologists Abraham Maslow, who formulated a Maslow's hierarchy of needs|hierarchy of human needs, and Carl Rogers, who created and developed client-centered therapy. Later, positive psychology opened up humanistic themes to scientific modes of exploration.


Wolfgang Kohler, Max Wertheimer and Kurt Koffka co-founded the school of Gestalt psychology. This approach is based upon the idea that individuals experience things as unified wholes. This approach to psychology began in Germany and Austria during the late 19th century in response to the molecular approach of structuralism. Rather than Reductionism|breaking down thoughts and behavior to their smallest element, the Gestalt position maintains that the whole of experience is important, and the whole is different than the sum of its parts.

Gestalt psychology should not be confused with the Gestalt therapy of Fritz Perls, which is only peripherally linked to Gestalt psychology.


In the 1950s and 1960s, largely influenced by the work of German philosopher Martin Heidegger and Danish philosopher Søren Kierkegaard, psychoanalytically trained American psychologist Rollo May pioneered an existential branch of psychology, which included existential therapy|existential psychotherapy, a method of therapy that operates on the belief that inner conflict within a person is due to that individual's confrontation with the givens of existence.

Existential psychologists differed from others often classified as humanistic in their comparatively neutral view of human nature and in their relatively positive assessment of anxiety.* Existential psychologists emphasized the humanistic themes of death, free will, and meaning, suggesting that meaning can be shaped by myths, or narrative patterns,* and that it can be encouraged by an acceptance of the free will requisite to an authenticity (philosophy)|authentic, albeit often anxious, regard for death and other future prospects.

Austrian existential psychiatrist and Holocaust survivor Viktor Frankl drew evidence of meaning's therapeutic power from reflections garnered from his own internment,* and he created a variation of existential psychotherapy called logotherapy, a type of existentialism|existentialist analysis that focuses on a Meaning (existential)|will to meaning (in one's life), as opposed to Adler's Nietzschean doctrine of will to power or Freud's Pleasure principle (psychology)|will to pleasure.*In addition to May and Frankl, Swiss psychoanalyst Ludwig Binswanger and American psychologist George Kelly (psychologist)|George Kelly may be said to belong to the existential school.*


Cognitive psychology is the branch of psychology that studies mental processes including problem solving, perception, memory, and learning. As part of the larger field of cognitive science, this branch of psychology is related to other disciplines including neuroscience, philosophy, and linguistics.

Noam Chomsky helped to launch a "cognitive revolution" in psychology when he criticized the behaviorists' notions of "stimulus", "response", and "reinforcement". Chomsky argued that such ideas—which Skinner had borrowed from animal experiments in the laboratory—could be applied to complex human behavior, most notably language acquisition, in only a superficial and vague manner. The postulation that humans are born with the instinct or "language acquisition device|innate facility" for acquiring language posed a challenge to the behaviorist position that all behavior, including language, is contingent upon learning and reinforcement.* Social learning theorists, such as Albert Bandura, argued that the child's environment could make contributions of its own to the behaviors of an observant subject.* Meanwhile, accumulating technology helped to renew interest and belief in the mental states and representations—i.e., the cognition—that had fallen out of favor with behaviorists. English neuroscientist Charles Sherrington and Canadian psychologist Donald O. Hebb used experimental methods to link psychological phenomena with the structure and function of the human brain|brain. With the rise of computer science and artificial intelligence, analogies were drawn between the processing of information by humans and information processing by machines. Research in cognition had proven practical since World War II, when it aided in the understanding of weapons operation.* By the late 20th century, though, cognitivism (psychology)|cognitivism had become the dominant paradigm of psychology, and cognitive psychology emerged as a popular branch.

Assuming both that the covert mind should be studied, and that the scientific method should be used to study it, cognitive psychologists set such concepts as subliminal message|subliminal processing and implicit memory in place of the psychoanalytic unconscious mind or the behavioristic contingency-shaped behaviors. Elements of behaviorism and cognitive psychology were synthesized to form the basis of cognitive behavioral therapy, a form of psychotherapy modified from techniques developed by American psychologist Albert Ellis (psychologist)|Albert Ellis and American psychiatrist Aaron T. Beck. Cognitive psychology was subsumed along with other disciplines, such as philosophy of mind, computer science, and neuroscience, under the cover discipline of cognitive science.


Psychology encompasses a vast domain and includes many different approaches to the study of mental processes and behavior.


Biological psychology or behavioral neuroscience is the study of the biological substrates of behavior and mental processes. There are different specialties within behavioral neuroscience. For example, physiological psychologists use animal models, typically rats, to study the neural, genetic, and cellular mechanisms that underlie specific behaviors such as learning and memory and fear responses.* Cognitive neuroscientists investigate the neural correlates of psychological processes in humans using neural imaging tools, and neuropsychologists conduct psychological assessments to determine, for instance, specific aspects and extent of cognitive deficit caused by brain damage or disease.


Clinical psychology includes the study and application of psychology for the purpose of understanding, preventing, and relieving psychologically based distress or Mental illness|dysfunction and to promote subjective Mental health|well-being and personal development. Central to its practice are psychological assessment and psychotherapy, although clinical psychologists may also engage in research, teaching, consultation, forensic testimony, and program development and administration.* Some clinical psychologists may focus on the clinical management of patients with Brain damage|brain injury—this area is known as clinical neuropsychology. In many countries, clinical psychology is a regulated mental health profession.

The work performed by clinical psychologists tends to be influenced by various therapeutic approaches, all of which involve a formal relationship between professional and client (usually an individual, couple, family, or small group). The various therapeutic approaches and practices are associated with different theoretical perspectives and employ different procedures intended to form a therapeutic alliance, explore the nature of psychological problems, and encourage new ways of thinking, feeling, or behaving. Four major theoretical perspectives are psychodynamic psychotherapy|psychodynamic, cognitive behavioral therapy|cognitive behavioral, humanistic psychology|existential–humanistic, and systems or family therapy. There has been a growing movement to integrate the various therapeutic approaches, especially with an increased understanding of issues regarding culture, gender, spirituality, and sexual orientation. With the advent of more robust research findings regarding psychotherapy, there is evidence that most of the major therapies are about of equal effectiveness, with the key common element being a strong therapeutic alliance.* Because of this, more training programs and psychologists are now adopting an Integrative Psychotherapy|eclectic therapeutic orientation.*


Green Red Blue
Purple Blue Purple
---- Blue Purple Red
Green Purple Green
---- The Stroop effect refers to the fact that naming the color of the first set of words is easier and quicker than the second.
Cognitive psychology studies cognition, the mental function|mental processes underlying mental activity. Perception, attention, reasoning, thinking, problem solving, memory, learning, language, and emotion are areas of research. Classical cognitive psychology is associated with a school of thought known as cognitivism (psychology)|cognitivism, whose adherents argue for an information processing model of mental function, informed by functionalism (philosophy of mind)|functionalism and experimental psychology.

On a broader level, cognitive science is an interdisciplinary enterprise of cognitive psychologists, cognitive neuroscientists, researchers in artificial intelligence, linguists, human–computer interaction, computational neuroscience, mathematical logic|logicians and anthropology|social scientists. Computer simulation|Computational models are sometimes used to simulate phenomena of interest. Computational models provide a tool for studying the functional organization of the mind whereas neuroscience provides measures of brain activity.


Comparative psychology refers to the scientific study of the behavior and mental processes of non-human animals, especially as these relate to the phylogenetic history, adaptive significance, and development of behavior. Research in this area addresses many different issues, uses many different methods, and explores the behavior of many different species, from insects to primates. It is closely related to other disciplines that study animal behavior such as ethology.* Research in comparative psychology sometimes appears to shed light on human behavior, but some attempts to connect the two have been quite controversial, for example the Sociobiology of E. O. Wilson.* Animal models are often used to study neural processes related to human behavior, e.g. in cognitive neuroscience.


Mainly focusing on the development of the human mind through the life span, developmental psychology seeks to understand how people come to perceive, understand, and act within the world and how these processes change as they age. This may focus on cognitive, affective, moral development|moral, social, or neural development. Researchers who study children use a number of unique research methods to make observations in natural settings or to engage them in experimental tasks. Such tasks often resemble specially designed games and activities that are both enjoyable for the child and scientifically useful, and researchers have even devised clever methods to study the mental processes of infants. In addition to studying children, developmental psychologists also study aging and processes throughout the life span, especially at other times of rapid change (such as adolescence and old age). Developmental psychologists draw on the full range of psychological theories to inform their research.

Educational and school

Educational psychology is the study of how humans learn in educational settings, the effectiveness of educational interventions, the psychology of teaching, and the social psychology of schools as organizations. The work of child psychologists such as Lev Vygotsky, Jean Piaget, Bernard Luskin, and Jerome Bruner has been influential in creating teaching methods and educational practices. Educational psychology is often included in teacher education programs in places such as North America, Australia, and New Zealand.

School psychology combines principles from educational psychology and clinical psychology to understand and treat students with learning disabilities; to foster the intellectual growth of intellectual giftedness|gifted students; to facilitate prosocial behaviors in adolescents; and otherwise to promote safe, supportive, and effective learning environments. School psychologists are trained in educational and behavioral assessment, intervention, prevention, and consultation, and many have extensive training in research.*


Evolutionary psychology examines psychological trait theory|traits—such as memory, perception, or language—from a evolution|modern evolutionary perspective. It seeks to identify which human psychological traits are evolved adaptations, that is, the functional products of natural selection or sexual selection. Evolutionary psychologists suggest that psychological adaptations evolved to solve recurrent problems in human ancestral environments. By focusing on the evolution of psychological traits and their adaptive functions, it offers complementary explanations for the mostly proximate or developmental explanations developed by other areas of psychology (that is, it focuses mostly on ultimate or "why?" questions, rather than proximate or "how?" questions).


Industrial and organizational psychology (I–O) applies psychological concepts and methods to optimize human potential in the workplace. Personnel psychology, a subfield of I–O psychology, applies the methods and principles of psychology in selecting and evaluating workers. I–O psychology's other subfield, organizational psychology, examines the effects of work environments and management styles on worker motivation, job satisfaction, and productivity.*


Personality psychology is concerned with enduring patterns of behavior, thought, and emotion—commonly referred to as wikt:personality|personality—in individuals. Theories of personality vary across different psychological schools and orientations. They carry different assumptions about suchissues as the role of the Unconscious mind|unconscious and the importance of childhood experience. According to Freud, personality is based on the dynamic interactions of the id, ego, and super-ego.* Trait theorists, in contrast, attempt to analyze personality in terms of a discrete number of key traits by the statistical method of factor analysis. The number of proposed traits has varied widely. An early model, proposed by Hans Eysenck, suggested that there are three traits which comprise human personality: extraversion and introversion|extraversion–introversion, neuroticism, and psychoticism. Raymond Cattell proposed a theory of 16 personality factors. Dimensional models of personality are receiving increasing support, and some version of dimensional assessment will be included in the forthcoming DSM-V.


Social psychology is the study of how humans think about each other and how they relate to each other. Social psychologists study such topics as the influence of others on an individual's behavior (e.g. conformity (psychology)|conformity, persuasion), and the formation of beliefs, attitude (psychology)|attitudes, and stereotypes about other people. Social cognition fuses elements of social and cognitive psychology in order to understand how people process, remember, or distort social information. The study of group dynamics reveals information about the nature and potential optimization of leadership, communication, and other phenomena that emerge at least at the microsociology|microsocial level. In recent years, many social psychologists have become increasingly interested in Implicit Association Test|implicit measures, mediation (statistics)|mediational models, and the interaction of both person and social variables in accounting for behavior. The study of human society is therefore a potentially valuable source of information about the causes of psychiatric disorder. Some of the sociological concepts applied to psychiatric disorders are the social role, sick role, social class, life event, culture, migration, social, and total institution.*


Positive psychology derives from Abraham Maslow|Maslow's humanistic psychology. Positive psychology is a discipline that utilizes evidence-based scientific methods to study factors that contribute to human happiness and strength. Different from clinical psychology, positive psychology is concerned with improving the mental well-being of healthy clients. Positive psychological interventions now have received tentative support for their beneficial effects on clients. In 2010 Clinical Psychological Review published a special issue devoted to positive psychological interventions, such as gratitude journaling and the physical expression of gratitude. There is, however, a need for further research on the effects of interventions. Positive psychological interventions have been limited in scope, but their effects are thought to be superior to that of placebos, especially with regard to helping people with Body dysmorphic disorder|body image problems.

Research methods

Psychology tends to be eclecticism|eclectic, drawing on knowledge from other fields to help explain and understand psychological phenomena. Additionally, psychologists make extensive use of Charles Sanders Peirce#Modes of inference|the three modes of inference that were identified by Charles Sanders Peirce|C. S. Peirce: deductive reasoning|deduction, inductive reasoning|induction, and abduction (logic)|abduction (hypothesis generation). While often employing deductive–nomological reasoning, they also rely on inductive reasoning to generate explanations. For example, evolutionary psychologists attempt to explain psychological traits—such as memory, perception, or language—as adaptations, that is, as the functional products of natural selection or sexual selection.

Psychologists may conduct basic research aiming for further understanding in a particular area of interest in psychology, or conduct applied research to solve problems in the clinic, workplace or other areas. Masters level clinical programs aim to train students in both research methods and evidence-based practice. Professional associations have established guidelines for ethics, training, research methodology and professional practice. In addition, depending on the country, state or region, psychological services and the title "psychologist" may be governed by statute and psychologists who offer services to the public are usually required to be licensed.

Qualitative and quantitative research

Research in most areas of psychology is conducted in accord with the standards of the scientific method. Psychological researchers seek the emergence of theoretically interesting categories and hypotheses from data, using qualitative research|qualitative or quantitative research|quantitative methods (or both).

Qualitative psychological research methods include interviews, first-hand observation, and participant observation. Creswell (2003) identifies five main possibilities for qualitative research, including narrative, Phenomenology (psychology)|phenomenology, ethnography, case study, and grounded theory. Qualitative researchers* sometimes aim to enrich hermeneutics|interpretations or critical theory|critiques of symbols, subject (philosophy)|subjective experiences, or social structures. Similar hermeneutic and critical aims have also been served by "quantitative methods", as in Erich Fromm's study of Authoritarian personality|Nazi voting or Stanley Milgram's Milgram experiment|studies of obedience to authority.

Quantitative psychological research lends itself to the statistical testing of hypotheses. Quantitatively oriented research designs include the experiment, quasi-experiment, cross-sectional study, case-control study, and longitudinal study. The measurement and operational definition|operationalization of important constructs is an essential part of these research designs. Statistical methods include the Pearson product–moment correlation coefficient, the analysis of variance, multiple linear regression, logistic regression, structural equation modeling, and hierarchical linear modeling.

Controlled experiments

Experimental psychological research is conducted in a laboratory under controlled conditions. This method of research relies on the application of the scientific method to understand behavior. Experimenters use several types of measurements, including rate of response, reaction time, and various psychometric measurements. Experiments are designed to Hypothesis testing|test specific hypotheses (deductive approach) or evaluate functional relationships (inductive approach). A true experiment with randomized controlled trial|random allocation of subjects to conditions allows researchers to infer causal relationships between different aspects of behavior and the environment. In an experiment, one or more variables of interest are controlled by the experimenter (independent variable) and another variable is measured in response to different conditions (dependent variable). Experiments are one of the primary research methods in many areas of psychology, particularly cognitive psychology|cognitive/psychonomics, mathematical psychology, psychophysiology and biological psychology/cognitive neuroscience.

Experiments on humans have been put under some controls, namely informed and voluntary consent. After World War II, the Nuremberg Code was established because of Nazi abuses of experimental subjects. Later, most countries (and scientific journals) adopted the Declaration of Helsinki. In the U.S., the National Institutes of Health established the Institutional Review Board in 1966, and in 1974 adopted the National Research Act (HR 7724). All of these measures encouraged researchers to obtain informed consent from human participants in experimental studies. A number of influential studies led to the establishment of this rule; such studies included the MIT and Fernald School radioisotope studies, the Thalidomide scandal|Thalidomide tragedy, the Willowbrook hepatitis study, and Stanley Milgram's studies of obedience to authority.

Survey questionnaires

Statistical surveys are used in psychology for measuring attitudes and traits, monitoring changes in mood, checking the validity of experimental manipulations, and for a wide variety of other psychological topics. Most commonly, psychologists use paper-and-pencil surveys. However, surveys are also conducted over the phone or through e-mail. Increasingly, web-based surveys are being used in research for its convenience and also to get a wide range of participants. Similar methodology is also used in applied setting, such as clinical assessment and personnel assessment.

Longitudinal studies

Longitudinal studies are often used in psychology to study developmental trends across the life span, and in sociology to study life events throughout lifetimes or generations. The reason for this is that unlike cross-sectional studies, longitudinal studies track the same people, and therefore the differences observed in those people are less likely to be the result of cultural differences across generations. Because of this benefit, longitudinal studies make observing changes more accurate and they are applied in various other fields.

Because most longitudinal studies are observational, in the sense that they observe the state of the world without manipulating it, it has been argued that they may have less power to detect causal relationships than do experiments. They also suffer methodological limitations such as from selective attrition because people with similar characteristics may be more likely to drop out of the study making it difficult to analyze.

Some longitudinal studies are experiments, called repeated-measures experiments. Psychologists often use the crossover study|crossover design to reduce the influence of confounding covariates and to efficiency (statistics)|reduce the number of subjects.

Observation in natural settings

Just as Jane Goodall studied chimpanzee social and family life by careful observation of chimpanzee behavior in the field, psychologists conduct observational studies of ongoing human social, professional, and family life. Sometimes the participants are aware they are being observed, and other times the participants do not know they are being observed. Strict ethical guidelines must be followed when covert observation is being carried out.

Qualitative and descriptive research

Research designed to answer questions about the current state of affairs such as the thoughts, feelings, and behaviors of individuals is known as descriptive research. Descriptive research can be qualitative or quantitative in orientation. Qualitative research is descriptive research that is focused on observing and describing events as they occur, with the goal of capturing all of the richness of everyday behavior and with the hope of discovering and understanding phenomena that might have been missed if only more cursory examinations have been made.

Neuropsychological methods

Neuropsychological research methods are employed in studies that examine the relation of mental activity and behavior to the structure and function of the human brain|brain. These methods include testing (e.g., the various David Wechsler|Wechsler scales, Wisconsin Card Sorting Test), functional neuroimaging, and transcranial magnetic stimulation.

Computational modeling

Computer simulation|Computational modeling* is a tool often used in mathematical psychology and cognitive psychology to simulate a particular behavior using a computer. This method has several advantages. Since modern computers process information extremely quickly, many simulations can be run in a short time, allowing for a great deal of statistical power. Modeling also allows psychologists to visualize hypotheses about the functional organization of mental events that couldn't be directly observed in a human.

Several different types of modeling are used to study behavior. Connectionism uses neural networks to simulate the brain. Another method is symbolic modeling, which represents many different mental objects using variables and rules. Other types of modeling include dynamic systems and stochastic process|stochastic modeling.

Animal studies

Animal experiments aid in investigating many aspects of human psychology, including perception, emotion, learning, memory, and thought, to name a few. In the 1890s, Russian physiologist Ivan Pavlov famously used dogs to demonstrate classical conditioning. Animal testing on non-human primates|Non-human primates, cats, dogs, pigeons, laboratory rat|rats, and other Animal testing on rodents|rodents are often used in psychological experiments. Ideally, controlled experiments introduce only one independent variable at a time, in order to ascertain its unique effects upon dependent variables. These conditions are approximated best in laboratory settings. In contrast, human environments and genetic backgrounds vary so widely, and depend upon so many factors, that it is difficult to control important variables for human subjects. Of course, there are pitfalls in generalizing findings from animal studies to humans through animal models.*



Criticisms of psychological research often come from perceptions that it is a "soft" science. Philosopher of science Thomas Kuhn's 1962 critique* implied psychology overall was in a pre-paradigm state, lacking the agreement on overarching theory found in mature sciences such as chemistry and physics.

Because some areas of psychologyrely on research methods such as surveys and questionnaires, critics have asserted that psychology is not an objective science. Other concepts that psychologists are interested in, such as personality psychology|personality, thinking, and emotion, cannot be directly measured* and are often inferred from subjective self-reports, which may be problematic.*Some critics view statistical hypothesis testing#Criticism|statistical hypothesis testing as misplaced. Research has documented that many psychologists confuse statistical significance with effect size|practical importance. Statistically significant but practically unimportant results are common with large samples.* Some psychologists have responded with an increased use of effect size statistics, rather than sole reliance on the Ronald A. Fisher|Fisherian P value|p < .05 statistical significance|significance criterion (whereby an observed difference is deemed "statistically significant" if an effect of that size or larger would occur with 5% -or less- frequency probability|probability in independence (probability theory)|independent replication (statistics)|replications, assuming the truth of the null-hypothesis of no difference between the treatments). False positive conclusions, often resulting from the Publish or perish|pressure to publish or the author's own confirmation bias, are an inherent hazard in the field, requiring a certain degree of skepticism on the part of readers.*Sometimes the debate comes from within psychology, for example between laboratory-oriented researchers and practitioners such as clinicians. In recent years, and particularly in the U.S., there has been increasing scientific debate|debate about the nature of therapeutic effectiveness and about the relevance of empirically examining psychotherapeutic strategies.*


Some observers perceive a gap between scientific theory and its application—in particular, the application of unsupported or unsound clinical practices.* Critics say there has been an increase in the number of mental health training programs that do not instill scientific competence.* One skeptic asserts that practices, such as "facilitated communication for infantile autism"; memory-recovery techniques including Bodywork (alternative medicine)|body work; and other therapies, such as Rebirthing-breathwork|rebirthing and reparenting, may be dubious or even dangerous, despite their popularity.* In 1984, Allen Neuringer made a similar point regarding the experimental analysis of behavior.*

Ethical standards

Current ethical standards of psychology would not permit some studies to be conducted today. These human studies would violate the Human subject research#APA Ethics Code|Ethics Code of the American Psychological Association, the Canadian Code of Conduct for Research Involving Humans, and the Belmont Report. Current ethical guidelines state that using non-human animals for scientific purposes is only acceptable when the harm (physical or psychological) done to animals is outweighed by the benefits of the research.* Keeping this in mind, psychologists can use on animals research techniques that could not be used on humans.
  • An Milgram Experiment|experiment by Stanley Milgram raised questions about the ethics of scientific experimentation because of the extreme emotional stress suffered by the participants. It measured the willingness of study participants to obey an authority figure who instructed them to perform acts that conflicted with their personal conscience.*
  • Harry Harlow drew condemnation for his "pit of despair" experiments on rhesus macaque monkeys at the University of Wisconsin–Madison in the 1970s.* The aim of the research was to produce an animal model of major depressive disorder|clinical depression. Harlow also devised what he called a "rape rack", to which the female isolates were tied in normal monkey mating posture.* In 1974, American literary critic Wayne C. Booth wrote that, "Harry Harlow and his colleagues go on torturing their nonhuman primates decade after decade, invariably proving what we all knew in advance—that social creatures can be destroyed by destroying their social ties." He writes that Harlow made no mention of the criticism of the morality of his work.*University psychology departments have ethics committees dedicated to the rights and well-being of research subjects. Researchers in psychology must gain approval of their research projects before conducting any experiment to protect the interests of human participants and laboratory animals.*

    Systemic bias

    In 1959 statistician Theodore Sterling examined the results of psychological studies and discovered that 97% of them supported their initial hypotheses, implying a possible publication bias.* Similarly, Fanelli (2010)* found that 91.5% of psychiatry/psychology studies confirmed the effects they were looking for, and concluded that the odds of this happening (a positive result) was around five times higher than in fields such as space science|space- or geosciences. Fanelli argues that this is because researchers in "softer" sciences have fewer constraints to their conscious and unconscious biases.

    In 2010, a group of researchers reported a systemic bias in psychology studies towards WEIRD ("western, educated, industrialized, rich and democratic") subjects.* Although only 1/8 people worldwide fall into the WEIRD classification, the researchers claimed that 60–90% of psychology studies are performed on WEIRD subjects. The article gave examples of results that differ significantly between WEIRD subjects and tribal cultures, including the Müller-Lyer illusion.
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    * This article is updated daily from Wikipedia. It may contain minor formatting errors.
    For the original content and references, click here. Last update: 8/18/2013.

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