Accession Number:

ADA248349

Title:

Visual Psychophysics of Egomotion.

Descriptive Note:

Annual rept. 1 Dec 90-30 Nov 91,

Corporate Author:

PURDUE UNIV LAFAYETTE IN JET PROPULSION CENTER

Personal Author(s):

Report Date:

1992-02-24

Pagination or Media Count:

11.0

Abstract:

Two psychophysical studies investigated an observers ability to perceive self motion. In both studies, the stimuli were computer-generated images simulating an observer moving relative to a volume of randomly-positioned dots. The first study investigated an observers ability to determine whether s he was moving forward along a straight or curved path as forward speed was varied. The results showed that with eye movements, the deviation required to detect a departure from a straight path increased with forward speed. When eye movements were restricted, the required deviation remained constant across forward speeds. A second study investigated the effectiveness of various sizes and retinal locations of the stimulus in determining the direction of a curved path. The results showed an increasing linear relationship between optimal size and retinal eccentricity. Given optimally-scaled stimuli, the central and peripheral retinal locations yielded equivalent performance. Finally, a computational model has been developed to emulate a human observers ability to detect a curved path of motion. Computer simulations of the model have been run on a task to discriminate between a curved and straight path of motion. The simulation results closely match psychophysical data. Egomotion, Motion perception, Curvilinear motion, Self motion perception, Eccentricity, Eye movements.

Subject Categories:

  • Biology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE