Abstract

Temporal processing is different in the periphery than in the fovea. Two measures of temporal sensitivity, increment thresholds for onset asynchrony and temporal modulation thresholds (flicker), were studied in the fovea and at 20 deg in the lower visual field. The ability to detect incremental changes in the time between the onsets of two vertical lines was generally more precise in the fovea than at the peripheral locus, at least for asynchronies ranging from 10 to 80 msec. Flicker thresholds were measured from 1 to 40 Hz with a vertical-line target used for the asynchrony thresholds. The peripheral flicker function peaks at a higher temporal frequency (15–20 Hz) than the foveal function (8–10 Hz); this suggests that the peripheral temporal impulse response follows a faster time course than the foveal impulse response. Asynchrony discrimination would potentially provide a simple estimate of the temporal sensitivity underlying velocity discrimination. We find that asynchrony discrimination is not a good predictor of velocity thresholds; it fails at the high velocities at which velocity discrimination is most precise.

© 1984 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Visual Latency as a Function of Stimulus Onset, Offset, and Background Luminance*

Ralph W. Hansteen
J. Opt. Soc. Am. 61(9) 1190-1195 (1971)

Rapid Changes in Foveal Sensitivity Resulting from Direct and Indirect Adapting Stimuli*

Robert M. Boynton, William R. Bush, and Jay M. Enoch
J. Opt. Soc. Am. 44(1) 56-60 (1954)

Motion thresholds can be predicted from contrast discrimination

Bettina L. Beard, Stanley A. Klein, and Thom Carney
J. Opt. Soc. Am. A 14(9) 2449-2470 (1997)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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

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 OSA member, or as an authorized user of your institution.

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

Figures (7)

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

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

Tables (1)

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

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

Equations (1)

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

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

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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