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

Effects of spatial frequency, duration, and contrast on discriminating motion directions

Not Accessible

Your library or personal account may give you access

Abstract

The minimum speed required for discriminating the direction of drifting gratings was measured at a variety of spatial frequencies, display durations, and contrasts. As was reported previously, speed thresholds were relatively constant for middle and high spatial frequencies, but speed threshold was found to be almost inversely proportional to spatial frequency in the range of 0.25 to 1.0 c/deg. Speed threshold was also found to be inversely proportional to duration between 73 and 400 ms. These results at low frequencies and short durations are shown to be consistent with limits set by the spread of energy in the stimuli, producing velocity uncertainty. A quantitative model of temporal filtering is presented that largely accounts for results at all spatial frequencies and durations by the inclusion of constant positional noise. A discussion includes the possible roles of magnocellular and parvocellular mechanisms in mediating speed thresholds.

© 1997 Optical Society of America

Full Article  |  PDF Article
More Like This
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)

Red–green and achromatic temporal filters: a ratio model predicts contrast-dependent speed perception

Andrew B. Metha and Kathy T. Mullen
J. Opt. Soc. Am. A 14(5) 984-996 (1997)

Detection of relative and uniform motion

Satoshi Shioiri, Sadanori Ito, Kentaro Sakurai, and Hirohisa Yaguchi
J. Opt. Soc. Am. A 19(11) 2169-2179 (2002)

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

Tables (1)

You do not have subscription access to this journal. Article tables 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

Equations (9)

You do not have subscription access to this journal. Equations 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