One of the earliest ways of obtaining psychological information using descriptive techniques was through clinical interviewing. The early interviews conducted by Sigmund Freud in the late 1800's were based on question-and-answer medical formats, which is not surprising, considering that Freud was originally a physician. Later, Freud relied on the less structured free-association technique. In 1902, Adolf Meyer developed a technique to assess a client's mental functioning, memory, attention, speech, and judgment. Independent of the style used, all the early clinical interviews sought to get a psychological portrait of the person, determine the source of the problem, make a diagnosis, and formulate a treatment. More detailed studies of interviews were conducted in the 1940's and 1950's to compare and contrast interviewing styles and determine how much structure was necessary. During the 1960's, much research came about as a result of ideas held by Carl Rogers, who emphasized the interpersonal elements he thought were necessary for the ideal therapeutic relationship; among them are warmth, positive regard, and genuineness on the part of the interviewer.
In the 1800's and early 1900's, interviews were used mainly by psychologists who were therapists helping people with problems such as fear, depression, and hysteria. During that same period, experimental psychologists had not yet begun to use survey research methods. Instead, they used introspection to investigate their own thought processes. For example, experimental psychologist Hermann Ebbinghaus gave himself lists of pronounceable nonsense syllables to remember; he then tested his own memory and attempted to improve it methodically. Many experimental psychologists during this period relied upon the use of animals such as dogs and laboratory rats to conduct behavioral research.
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