Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Two mechanisms for the detection of slow motion

Not Accessible

Your library or personal account may give you access

Abstract

The lowest velocity at which motion can be detected, the lower threshold of motion (LTM), has been investigated as a function of eccentricity. Results show that temporal properties of the LTM change with eccentricity, suggesting a dichotomy in the temporal properties of the neural mechanisms subserving this aspect of central and peripheral vision. Suprathreshold drifting sinusoidal gratings were used with a method of constant stimuli (a two-alternative forced-choice procedure) to obtain the LTM for different stimulus durations at different eccentricities. Results for central vision support a displacement-based model of movement detection similar to that of Reichardt [in Sensory Communication, W. A. Rosenblith, ed. ( Wiley, New York, 1961), p. 303]. The LTM decreases as the stimulus duration increases, thus maintaining a constant minimum displacement. However, the results for the far periphery (35 deg of eccentricity) suggest a different mechanism, in which detection depends not on a constant displacement but on a constant velocity; as the stimulus duration increases, the LTM remains constant. These results for gratings can also be generalized to other stimuli, for example, random-dot patterns presented in apparent motion.

© 1987 Optical Society of America

Full Article  |  PDF Article
More Like This
Velocity discrimination in central and peripheral visual field

Guy A. Orban, Frank Van Calenbergh, Bart De Bruyn, and Hugo Maes
J. Opt. Soc. Am. A 2(11) 1836-1847 (1985)

Influence of contrast on foveal and peripheral detection of coherent motion in moving random-dot patterns

W. A. van de Grind, J. J. Koenderink, and A. J. van Doorn
J. Opt. Soc. Am. A 4(8) 1643-1652 (1987)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved