Accession Number : ADA261514


Title :   Top-Down Influences on Bottom-Up Processing.


Descriptive Note : Annual rept. Jan-Dec 92,


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF BRAIN AND COGNITIVE SCIENCES


Personal Author(s) : Richards, Whitman


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261514.pdf


Report Date : 12 Jan 1993


Pagination or Media Count : 17


Abstract : Although perception is the subject of extensive study, there has been no formal definition of this state. We offer one, and show how even a rather simple formal conceptualization of a percept entails a considerable amount of machinery. Over the past year or two, several components of the machinery required have been studied. These include (1) the role of especially powerful features, called 'Key Features', and (2) how perceptual categories incorporate world knowledge. There also has been progress in understanding preferences for certain structures, as well as in the dynamics of altering preferences (Chaos in Percepts).... Vision, Al, Cognition, Neurophysiology, Visual psychophysics, Dynamical systems.


Descriptors :   *COGNITION , *VISION , *PERCEPTION , AIR FORCE RESEARCH , PSYCHOPHYSICS , NEUROPHYSIOLOGY , BRAIN , DYNAMICS , CHAOS


Subject Categories : Psychology
      Anatomy and Physiology


Distribution Statement : APPROVED FOR PUBLIC RELEASE