Transcription of Knowledge in perception and illusion - Richard Gregory
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Knowledge in perception and illusion - Richard Gregory
Knowledge in perception and illusion1 Knowledge in perceptionand illusionRichard L GregoryFrom: Phil. Trans. R. Soc. Lond. B (1997) 352, 1121 1128 Department of Psychology, University of Bristol, 8 WoodlandRoad, Bristol BS8 1TA UKSummaryFollowing Hermann von Helmholtz, who described visualperceptions as unconscious inferences from sensory data andknowledge derived from the past, perceptions are regarded assimilar to predictive hypotheses of science, but arepsychologically projected into external space and accepted as ourmost immediate reality. There are increasing discrepanciesbetween perceptions and conceptions with science s advances,which makes it hard to define illusion . Visual illusions canprovide evidence of object Knowledge and working rules forvision, but only when the phenomena are explained and tentative classification is presented, in terms of appearances andkinds of large contribution of Knowledge from the past for visionraises the issue: how do we recognize the present, withoutconfusion from the past.
Knowledge in perception and illusion 2 different from the flat ghostly images in eves. Some phenomena of illusion provide evidence for the uses of knowledge for vision; this is revealed when it is not appropriate to the situation and so causes a systematic error, even though the physiology is working
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