Citation

Portfors-Yeomans CV, Regan D. J. Exp. Psychol. Hum. Percept. Perform. 1997; 23(1): 227-243.

Affiliation

Department of Biology, York University, Ontario, Canada.

Copyright

(Copyright © 1997, American Psychological Association)

DOI

unavailable

PMID

9157184

Abstract

Thresholds for discriminating a monocularly visible object's direction of motion in depth and speed of motion in depth were measured using only binocular cues. Observers could discriminate the direction of motion in depth while totally ignoring speed and discriminate the speed of motion in depth while totally ignoring direction. Direction discrimination thresholds were the same for motion in depth within the vertical and horizontal meridians, even though a cue to trajectory was available for motion within the horizontal meridian that is not available for motion within the vertical meridian. Speed discrimination thresholds also were the same for motion in depth within the vertical and horizontal meridians. For the 3 observers the lowest direction discrimination thresholds were 0.14 degree, 0.18 degree, and 0.22 degree (means of horizontal and vertical thresholds).

Language: en