Abstract

Psychophysical thresholds for the detection of divergence (expansion and contraction) in the presence of a translational component are determined. Stimuli consist of sparse random dot patterns. Lifetime, number of dots, divergence, and translational velocity are varied over a wide range. Moreover, the two major characteristics of a divergence pattern, namely, the direction of and the velocity along the flow lines, are also varied independently. Lifetime and number of dots have only a small influence on performance. Over a wide range the detection of divergence is independent of the translational component. The results indicate that the direction of flow lines is an important, but by no means the only, characteristic in divergence detection. This provides evidence that, at least in these experiments, no use is made of a mechanism selectively sensitive for divergence.

© 1996 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Detection of vorticity in optical flow fields

Astrid M. L. Kappers, Andrea J. van Doorn, and Jan J. Koenderink
J. Opt. Soc. Am. A 11(1) 48-54 (1994)

Detection of second-order structure in optical flow fields

Susan F. te Pas, Astrid M. L. Kappers, and Jan J. Koenderink
J. Opt. Soc. Am. A 14(4) 767-778 (1997)

Visual responses to vorticity and the neural analysis of optic flow

D. Regan and K. I. Beverley
J. Opt. Soc. Am. A 2(2) 280-283 (1985)

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

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