The school of Gestalt psychology holds the constituents of thinking to be of essentially the same nature as the perceptual patterns that the nervous system constructs out of sensory excitations. After the mid-20th century, analogies with computer operations acquired great currency; in consequence, thinking came to be described in terms of storage, retrieval, and transmission of items of information. The information in question was held to be freely translatable from one “coding” to another without impairing its functions. What came to matter most was how events were combined and what other combinations might have occurred instead. The process of thought
According to the classical empiricist-associationist view, the succession of ideas or images in a train of thought is determined by the laws of association. Although additional associative laws were proposed from time to time, two invariably were recognized. The law of association by contiguity states that the sensation or idea of a particular object tends to evoke the idea of something that has often been encountered together with it. The law of association by similarity states that the sensation or idea of a particular object tends to evoke the idea of something that is similar to it. The early behaviourists, beginning with Watson, espoused essentially the same formulation but with some important modifications. For them the elements of the process were conceived not as conscious ideas but as fractional or incipient motor responses, each producing its proprioceptive stimulus. Association by contiguity and similarity were identified by these behaviourists with the Pavlovian principles of conditioning and generalization.
The Würzburg school, under the leadership of the German psychologist and philosopher Oswald Külpe, saw the prototype of directed thinking in the “constrained-association” experiment, in which the subject has to supply a word bearing a specified relation to a stimulus word (e.g., an opposite to an adjective, or the capital of a country). Introspective research led the members of the Würzburg school to conclude that the emergence of the required element depends jointly on the immediately preceding element and on some kind of “determining tendency” such as Aufgabe (“awareness of task”) or “representation of the goal.” The last two factors were held to impart a direction to the thought process and to restrict its content to relevant material. Their role was analogous to that of motivational factors—“drive stimuli,” “fractional anticipatory goal responses”—in the later neobehaviouristic accounts of reasoning (and of behaviour in general) produced by Hull and his followers.
Hull’s theory resembled the earlier “constellation theory” of constrained association developed by Georg Elias Müller. Hull held that one particular response will occur and overcome its competitors because it is associated both with the cue stimulus (which may be the immediately preceding thought process or an external event) and with the motivational condition (task, drive stimulus) and is thus evoked with more strength than are elements associated only with the cue stimulus or the motivational condition. The German psychologist Otto Selz countered that in many situations this kind of theory would imply the occurrence of errors as often as correct answers to questions and thus was untenable. Selz contended that response selection depends rather on a process of “complex completion” that is set in motion by an “anticipatory schema,” which includes a representation of both the cue stimulus and the relation that the element to be supplied must bear to the cue stimulus. The correct answer is associated with the schema as a whole and not with its components separately. Selz’s complex completion resembles the “eduction of correlates” that the British psychologist Charles E. Spearman saw as a primary constituent of intellectual functioning, its complement being “eduction of relations”—that is, recognition of a relation when two elements are presented.
The determination of each thought element by the whole configuration of factors in the situation and by the network of relations linking them was stressed still more strongly by the Gestalt psychologists in the 1920s and ’30s. On the basis of experiments by Wolfgang Köhler (on “insightful” problem solving by chimpanzees) and Max Wertheimer and his student Karl Duncker (on human thinking), they pointed out that the solution to a problem commonly requires an unprecedented response or pattern of responses that hardly could be attributed to simple associative reproduction of past behaviour or experiences. For them, the essence of thinking lay in sudden perceptual restructuring or reorganization, akin to the abrupt changes in appearance of an ambiguous visual figure.
The Gestalt theory has had a deep and far-reaching impact, especially in drawing attention to the ability of the thinker to discover creative, innovative ways of coping with situations that differ from any that have been encountered before. This theory, however, has been criticized for underestimating the contribution of prior learning and for not going beyond rudimentary attempts to classify and analyze the structures that it deems so important. Later discussions of the systems in which items of information and intellectual operations are organized have made fuller use of the resources of logic and mathematics. Merely to name them, they include the “psychologic” of Piaget, the computer simulation of human thinking by the American computer scientists Herbert A. Simon and Allen Newell, and extensions of Hull’s notion of the “habit-family hierarchy” by Irving Maltzman and Daniel E. Berlyne.
Also important is a growing recognition that the essential components of the thought process, the events that keep it moving in fruitful directions, are not words, images, or other symbols representing stimulus situations; rather, they are the operations that cause each of these representations to be succeeded by the next, in conformity with restrictions imposed by the problem or aim of the moment. In other words, directed thinking can reach a solution only by going through a properly ordered succession of “legitimate steps.” These steps might be representations of realizable physicochemical changes, modifications of logical or mathematical formulas that are permitted by rules of inference, or legal moves in a game of chess. This conception of the train of thinking as a sequence of rigorously controlled transformations is buttressed by the theoretical arguments of Sechenov and of Piaget, the results of the Würzburg experiments, and the lessons of computer simulation.
Early in the 20th century, the French physician Édouard Claparède and the American philosopher John Dewey both suggested that directed thinking proceeds by “implicit trial-and-error.” That is to say, it resembles the process whereby laboratory animals, confronted with a novel problem situation, try out one response after another until they sooner or later hit upon a response that leads to success. In thinking, however, the trials were said to take the form of internal responses (imagined or conceptualized courses of action, directions of symbolic search); once attained, a train of thinking that constitutes a solution frequently can be recognized as such without the necessity of implementation through action and sampling of external consequences. This kind of theory, popular among behaviourists and neobehaviourists, was stoutly opposed by the Gestalt school, whose insight theory emphasized the discovery of a solution as a whole and in a flash.