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From Wikipedia, the free encyclopedia

Experimental psychology is a methodological approach rather than a subject and encompasses varied fields within psychology. Experimental psychologists have traditionally conducted research, published articles, and taught classes on neuroscience, developmental psychology, sensation, perception, attention, consciousness, learning, memory, thinking, and language. Recently, however, the experimental approach has extended to motivation, emotion, and social psychology.

Experimental psychologists conduct research with the help of experimental methods. The concern of experimental psychology is discovering the processes underlying behavior and cognition.


History of Experimental Psychology


Early experimental psychology

Experimental psychology emerged as a modern academic discipline in the 19th century when Wilhelm Wundt introduced a mathematical and experimental approach to the field and founded both the first psychology laboratory in Leipzig, Germany and the structuralist school of psychology[1]. Other early experimental psychologists, including Hermann Ebbinghaus and Edward Titchener, included introspection among their experimental methods.

George Trumbull Ladd was the first to introduce (1879) the study of experimental psychology into America; he founded the Yale University psychological laboratory. In 1887, he published Elements of Physiological Psychology, the first American textbook to include a substantial amount of information on the new experimental form of the discipline.

20th Century

In the first half of the twentieth century, behaviourism became a dominant paradigm within psychology, especially in the United States. This led to some neglect of mental phenomena within experimental psychology. In Europe this was less the case, as European psychology was influenced by psychologists such as Sir Frederic Bartlett, Kenneth Craik, W. E. Hick and Donald Broadbent, who focused on topics such as thinking, memory and attention. This laid the foundations for the subsequent development of cognitive psychology.

In the latter half of the twentieth century, the phrase "experimental psychology" has shifted in meaning due to the expansion of psychology as a discipline and the growth in the size and number of its sub-disciplines. Experimental psychologists use a range of methods and do not confine themselves to a strictly experimental approach, partly because developments in the philosophy of science have had an impact on the exclusive prestige of experimentation. In contrast, an experimental method is now widely used in fields such as developmental and social psychology, which were not previously part of experimental psychology. The phrase continues in use, however, in the titles of a number of well-established, high prestige learned societies and scientific journals, as well as some university courses of study in psychology.


Experimental Psychologists study human behavior in different contexts. Often, human participants are instructed to perform tasks in an experimental setup. Since the 1990s, various software packages have eased stimulus presentation and the measurement of behavior in the laboratory. Apart from the measurement of response times and error rates, experimental psychologists often use surveys before, during, and after experimental intervention and observation methods.


The complexity of human behaviour and mental processes, the ambiguity with which they can be interpreted and the unconscious processes to which they are subject gives rise to an emphasis on sound methodology within experimental psychology.

Control of extraneous variables, minimizing the potential for experimenter bias, counterbalancing the order of experimental tasks, adequate sample size, and the use of operational definitions which are both reliable and valid, and proper statistical analysis are central to experimental methods in psychology. As such, most undergraduate programmes in psychology include mandatory courses in Research Methods and Statistics.

Other Methods

While other methods of research - case study, correlational, interview, and naturalistic observation - are practiced within fields typically investigated by experimental psychologists, experimental evidence remains the gold standard for knowledge in psychology. Many experimental psychologists have gone further, and have treated all methods of investigation other than experimentation as suspect. In particular, experimental psychologists have been inclined to discount the case study and interview methods as they have been used in clinical.


Critical and postmodernist psychologists conceive of humans and human nature as inseparably tied to the world around them, and claim that experimental psychology approaches human nature and the individual as entities independent of the cultural, economic, and historical context in which they exist. At most, they argue, experimental psychology treats these contexts simply as variables effecting a universal model of human mental processes and behaviour rather than the means by which these processes and behaviours are constructed. In so doing, critics assert, experimental psychologists paint an inaccurate portrait of human nature while lending tacit support to the prevailing social order.

Three days before his death, radical behaviourist B.F. Skinner criticized experimental psychology in a speech to the American Psychological Association for becoming increasingly "mentalistic" - that is, focusing research on internal mental processes instead of observable behaviours. This criticism was levelled in the wake of the cognitive revolution wherein behaviourism fell from dominance within psychology and functions of the mind were given more credence.

C. G. Jung criticized experimental psychology, maintaining that "anyone who wants to know the human psyche will learn next to nothing from [it]. He would be better advised to abandon exact science, put away his scholar's gown, bid farewell to his study, and wander with human heart through the world. There in the horrors of prisons, lunatic asylums and hospitals, in drab suburban pubs, in brothels and gambling-hells, in the salons of the elegant, the Stock Exchanges, socialist meetings, churches, revivalist gatherings and ecstatic sects, through love and hate, through the experience of passion in every form in his own body, he would reap richer stores of knowledge than text-books a foot thick could give him, and he will know how to doctor the sick with a real knowledge of the human soul." [2]


  1. ^ Omar Khaleefa (Summer 1999). "Who Is the Founder of Psychophysics and Experimental Psychology?", American Journal of Islamic Social Sciences 16 (2).
  2. ^


  • Edwin G. Boring. A History of Experimental Psychology. 2nd Edition. Prentice-Hall, 1950.
  • Robert L. Solso and M. Kimberly MacLin. Experimental Psychology: A Case Approach. 7th Edition. Allyn & Bacon, 2001.

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