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Psychology is the scientific study of the human mind; our inner, subjective experience, and behavior; our observable actions.
Modern psychology began in 1879 when Wilhelm Wundt founded the first psychological laboratory at the University of Leipzig. Though there are different schools of psychology (with the two prominent paradigms being "Psychoanalytic" and "Cognitive-Behavioral") all clinical psychologists value the idea of confidentiality with their clients as the main stepping stone to treatment.
Differences between psychology and other disciplines
The primary difference between psychology and other similar disciplines (e.g., philosophy, sociology, and anthropology) is that it generally focuses on individuals and change. This is in contrast to, for example, sociology, which focuses more on group behavior and society, or biology, which focuses on physiological processes. Nevertheless, there is often interdisciplinary overlap (e.g., between social psychology and sociology). A burgeoning trend is to investigate the neurological causes of thought and behavior, creating considerable overlap between some areas of psychology and neuroscience (e.g., cognitive neuroscience, behavioral neuroscience, and social cognitive neuroscience).
Within the last century a large number of the sub-fields in psychology have embraced a more rigorous application of the scientific method than its sister disciplines. However, this is starting to change as the influence of cultural anthropology and arm-chair theorizing in sociology wane. Studies in treatment efficacy have become the source of theory, rather than theory guiding practice.
Humanistic psychology emerged during the middle 20th century as a reaction against the perceived excesses of behaviorism. It is sometimes considered a third wave of psychology after the first wave, Freudianism, and the second wave, B.F. Skinner and behaviorism. Humanistic psychology emphasized the innate goodness and capacity for growth in each individual, holding self-actualization, a need for love and belonging, and self-esteem to be high in importance. Representing a break from both Freud and Skinner, it was influenced by existentialism, and in turn was very influential in mainstream psychology during the late 20th century, as well as being an influence on more woo-based movements such as the Human Potential Movement.
Among the best known figures in humanistic psychology were Abraham Maslow, Carl Rogers, and Fritz Perls. Maslow coined the idea of a hierarchy of human needs. Starting with basic physical needs at the bottom (food, clothing, sleep, shelter), it progressed up through safety and stability (health, home, employment), love and belonging, self-esteem and achievement, and finally self-actualization. Once each need below was secured, fulfilling the next need would be the goal which a person would most often seek. In a prosperous society where all the lower needs were met, self-actualization would be the final goal. It is also the most nebulous concept in the hierarchy; to that end, Maslow also coined the idea of peak experiences, which are moments in which a person experiences transcendence, a feeling of completeness, or an experience perceived as highly spiritual. Perls founded Gestalt therapy, a form of encounter group emphasizing intimate sharing of personal feelings and experiential personal growth. Others often regarded as part of humanistic psychology include Eric Berne, Paul Goodman, Timothy Leary, and R.D. Laing. While not part of humanistic psychology, the ideas of other contemporaneous writers like Thomas Szasz and Eric Hoffer shared some similarities.
While humanistic psychology was most popular from the mid-20th century until the 1980s, it went out of vogue during the 1980s, partly because the conservative backlash regarded it as touchy-feely and part of the general zeitgeist of the social changes of the 1960s and 1970s. A more notable reason is because at the same time humanistic psychology was in vogue, a science-based cognitive revolution was also taking place in psychology which eventually won out over humanistic psychology in many places. The tendency of various woo-meisters to appeal to ideas derived from humanistic psychology and the movement's connections to the Human Potential Movement provided further areas for criticism. Humanistic psychology remains popular in several countries like Mexico or Argentina, despite criticism.
Psychology in crisis
In recent years, psychology has been struggling replication crisis. An attempt to reproduce many of the 100 well-known studies failed to reproduce results. Among social psychology experiments, only 14/55 (25%) replicated; among cognitive psychology experiments, only 21/41 (50%) replicated.
After preliminary results were published, some of those people whose studies failed to be reproduced accused the reproduction study authors of bullying. In another study, many published psychology papers have been accused of using flawed statistics and of failure to examine alternative hypotheses.
Since the publication of the replication studies, Harvard University psychologist Daniel Gilbert has argued that the replication studies contained key errors. Nonetheless, at least one researcher outside the field of psychology has not been impressed by the results. Stanford University epidemiologist John Ioannidis said, "The very best scientists cannot really agree on what the results of the most important paper in the recent history of psychology mean." In a reanalysis of the experiments, Alexander Etz and Joachim Vandekerckhove argued that the failures to replicate occurred largely because of original studies that used too few participants to generate strong statistical results, and also because of journals' bias of only publishing experiments with positive results.
Potentially harmful treatments
Despite psychology being a social science, some clinical psychologists are resistant to evidence-based practice. And despite the phrase primum non nocere (first, do no harm) being precept of bioethics and medicine, some types of psychological treatments have been shown to be harmful yet continue to be practiced. Lilienfeld identified several psychological therapies that are likely to be harmful:
- Critical incident stress debriefing — risk of post-traumatic stress disorder symptoms
- Scared Straight interventions — exacerbation of conduct problems, leading to increased crime. A 2004 study found that Scared Straight programs have a net estimated program cost to society of $203.51 for every dollar spent (e.g., due to increased imprisonment).
- Facilitated communication — a therapy for treating autistic children based on the idea that autism is a non-cognitive motor problem; it has been associated with possibly false accusations of child abuse
- Attachment therapy (rebirthing) — several deaths and serious injuries of children have been resulted from this treatment
- Recovered-memory techniques — production of false memories
- Dissociative Identity Disorder-oriented therapy — induction of "alters" (alternative identities)
- Grief counseling for individuals with normal bereavement reactions — increased depression
- Expressive-experiential therapies (focused expressive psychotherapy, gestalt therapy) — exacerbation of painful emotions
- Boot-camp interventions for conduct disorder — exacerbation of conduct problems,  risk of death from abusive treatment
- DARE programs (Drug Abuse Resistance Education) — ineffective, increased alcohol or other drug usage
Psychology in popular culture
Amongst the general public ideas about psychology come most prominently from pop psychology which aims at the mass market, often through self-help moddalities and large group awareness training motivational seminars. Pop psychology is generally disdained by those in the broader psychology field because of its widely varying quality, lack of peer review, oversimplification of complex psychological principles, and frequent inclusion of ideas taken from pseudoscience.
Another prominent source is historical, anecdotal and personal experience of clinical psychology. Clinical psychology is popularly linked to psychoanalysis and to Freud. None of Freud's ideas were developed using any sort of testable hypotheses and almost all have been repudiated over time. Modern psychology places a high emphasis on empirical testing and data for various interventions. This emphasis is seen throughout the various orientations of psychology such as cognitive behavioral and psychoanalytic. The empirical testing is peer-reviewed for publication in various journals. Researchers have repeatedly demonstrated that empirically-based treatments such as action-commitment therapy and dialectical behavior therapy can reduce troublesome symptoms in clients.
There are, however, subsets of psychology which focus on pseudoscience and promote that notion that psychology cannot be a "hard/regulated science". Infamously, the "Integrative Psychology" movement in California, started by Ken Wilber, seeks to incorporate "spirituality" as a dimension of health.
The fact that these two branches are the source for most popular opinions on psychology may explain why the much more scientifically rigorous and instructive sub-fields (such as cognitive psychology, evolutionary psychology, and neuro-psychology) have had to fight an uphill battle towards widespread acceptance.
- Albert Bandura, investigated how individuals learn from others and developed social learning theory.
- Sigmund Freud, based on case histories, wrote extensively about childhood, personality, society, and the unconscious. Significantly influenced popular ideas about psychology.
- William James, founded the psychology department at Harvard University.
- Carl Jung, influential psychologist who is known for the concept of archetypes as well as some minor study of psychology through pseudoscience such as mythology and dream interpretation.
- Alfred Kinsey, conducted research on human sexuality.
- Jean Piaget, conducted seminal research into the origins of intelligence in children. Creator of the often misunderstood and misused Intelligence Quotient test.
- Wilhelm Reich, known for his psychological theories on fascism, later became involved with orgone energy pseudoscience.
- Carl Rogers, founder of Humanistic Psychology, he is one of the most influential psychologists in professional circles and in popular culture.
- B.F. Skinner, emphasized empiricism and the study of observable behavior rather than subjective mental processes.
- Wilhelm Wundt, created the first psychology lab. Father of modern psychology.
- Jordan B. Peterson, popular & influential contemporary psychologist; popular among conservatives and reactionaries, known for using credentialism to promote bullshit about lobsters and meat-only diets.
- Psychology results evaporate upon further review: Surprising reports, findings with marginal statistical significance least likely to be reproduced, study concludes by Bruce Bower (2:00pm, August 27, 2015) Science News.
- Estimating the reproducibility of psychological science by B. A. Nosek et al. 28 August 2015: Vol. 349 no. 6251 Science DOI: 10.1126/science.aac4716.
- Replication effort provokes praise—and ‘bullying’ charges (Science 23 May 2014: Vol. 344 no. 6186 pp. 788-789)
- Closed Thinking: Without scientific competition and open debate, much psychology research goes nowhere (Science News, May 16, 2013)
- Psychology’s replication crisis sparks new debate: Analyses of major reproducibility review reach conflicting conclusions by Bruce Bower 2:41pm, March 3, 2016) Science News.
- Comment on "Estimating the reproducibility of psychological science" by Daniel T. Gilbert et al. Science 04 Mar 2016: Vol. 351, Issue 6277, pp. 1037 DOI: 10.1126/science.aad7243.
- A Bayesian Perspective on the Reproducibility Project: Psychology by Alexander Etz & Joachim Vandekerckhove. PLOS One Published: February 26, 2016.
- Why many clinical psychologists are resistant to evidence-based practice: root causes and constructive remedies (2013) Clin Psychol Rev. 33(7):883-900. doi:10.1016/j.cpr.2012.09.008.
- Psychological Treatments That Cause Harm by Scott O. Lilienfeld (2007) 2(1):53-70.
- "Scared Straight" and other juvenile awareness programs for preventing juvenile delinquency by Anthony Petrosino et al. (30 April 2013) Cochrane Review. doi:10.1002/14651858.CD002796.pub2.
- Benefits and Costs of Prevention and Early Intervention Programs for Youth (September 17, 2004) Washington State Institute for Public Policy.
- Attachment Therapy on Trial: The Torture and Death of Candace Newmaker by Jean Mercer et al. (2003) Praeger. ISBN 0275976750.
- Utah wilderness therapy deaths (2003) The Salt Lake Tribune (archived from December 6, 2003).
- The Pseudo-science of Sexual Orientation Conversion Therapy by Douglas C. Haldeman (1999) Angles 4(1):1-4.
- Therapies Focused on Attempts to Change Sexual Orientation (Reparative or Conversion Therapies) (2000) American Psychiatric Association (archived from April 7, 2011).
- See the Wikipedia article on mass market.
- See the Wikipedia article on Ken Wilber.