Richard Gregory
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Richard Langton Gregory CBE FRS FRSE (24 July 1923 – 17 May 2010) was a British psychologist and Emeritus Professor of Neuropsychology at the University of Bristol.
Contribution
Gregory's main contribution to the discipline was in the development of cognitive psychology, in particular that of "Perception as hypotheses", an approach which had its origin in the work of Hermann von Helmholtz (1821–1894) and his student Wilhelm Wundt (1832–1920). Between them, the two Germans laid the basis of investigating how the senses work, especially sight and hearing.
According to Gregory, Helmholtz should take the credit for realising that perception is not just a passive acceptance of stimuli, but an active process involving memory and other internal processes.
Gregory progressed this idea with a key analogy. The process whereby the brain puts together a coherent view of the outside world is analogous to the way in which the sciences build up their picture of the world, by a kind of hypothetico-deductive process. Although this takes place on a quite different time-scale, and inside one head instead of a community, nevertheless, according to Gregory, perception shares many traits with scientific method. A series of works by Gregory developed this idea in some detail.
Gregory's ideas ran counter to those of the American direct realist psychologist J.J. Gibson, whose 1950 The Perception of the Visual World was dominant when Gregory was a younger man. Much in Gregory's work can be seen as a reply to Gibson's ideas, and as the incorporation of explicitly Bayesian concepts into the understanding of how sensory evidence is combined with pre-existing ("prior") beliefs. Gregory argued that optical illusions, such as the illusory contours in the Kanizsa triangle, demonstrated the Bayesian processing of perceptual information by the brain.
