Accession Number : ADA254098

Title :   Perceptual Constraints on Understanding Physical Dynamics.

Descriptive Note : Annual rept. 1 Dec 90-30 Nov 91,

Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE DEPT OF PSYCHOLOGY

Personal Author(s) : Proffitt, Dennis R. ; Glidden, David

Report Date : 30 NOV 1991

Pagination or Media Count : 4

Abstract : The work completed covers four distinct sets of experiments. (1) Dynamical understandings of multidimensional systems: Two sets of published studies, one theoretical article, and one doctoral dissertation have been completed. These works demonstrate that people employ heuristics when evaluating ongoing dynamical systems and that their ability to extract relevant motion information is limited by general principles of perceptual organization. (2) Learning to evaluate dynamical systems: Our work indicates that judgements of rotation, translation, size, and angle form an algebraic difference structure. However, the operations that can be performed on translation and size are different from those that can be applied to rotation and angle. (3) Path perception in both apparent and continuous motions: One set of studies has been published in which it is shown that the apparent motion of an object that undergoes an orientation change in depth is resob and by a perceived curved trajectory in depth. (4) Basic issues in motion information processing. Two the sets of experiments have been published. It was found that in both the perception of depth in small object rotations and in motion parallax the perceptual system extracts only a subset of the motions present in optical flow and combines this with inherent perceptual biases.

Descriptors :   *DYNAMICS, *PERCEPTION, *PHYSICS, ANGLES, COGNITION, DEPTH, FLOW, INFORMATION PROCESSING, LEARNING, MOTION, OPERATION, ORGANIZATIONS, PATHS, PROCESSING, ROTATION, STRUCTURES, THESES, TRAJECTORIES, TRANSLATIONS, WORK, DISPLACEMENT, JUDGEMENT(PSYCHOLOGY), PHYSICAL PROPERTIES, VOLUME, QUANTITY, SIZES(DIMENSIONS).

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE