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

Recurrent networks in human visual cortex: psychophysical evidence

Not Accessible

Your library or personal account may give you access

Abstract

To study the neuronal circuitry underlying visual spatial-integration processes, we measured the effect of short and long chains of proximal Gabor-signal (GS) flankers (σ=λ=0.15°) on the contrast-discrimination function of a foveal GS target. We found that the same pattern of lateral masks enhanced target detection with low-contrast pedestals and strongly suppressed the discrimination of a range of intermediate pedestal contrasts (pedestal contrast <30%). Increasing the number of the flankers reversed the suppressive effect. The data suggest that the main influence of the proximal flankers is maintained by activity-dependent interactions and not by linear spatial summation. With an increased number of flankers, we found a nonmonotonic relationship between the discrimination thresholds and the number of flankers, supporting the notion that the discrimination thresholds are mediated by excitatory–inhibitory recurrent networks that manifest the dynamics of large neuronal populations in the neocortex [Proc. Natl. Acad. Sci. USA 94, 10426 (1997)].

© 2001 Optical Society of America

Full Article  |  PDF Article
More Like This
Human luminance pattern-vision mechanisms: masking experiments require a new model

John M. Foley
J. Opt. Soc. Am. A 11(6) 1710-1719 (1994)

Single additive mechanism predicts lateral interactions effects—computational model

Hava Matichin, Shmuel Einav, and Hedva Spitzer
J. Opt. Soc. Am. A 32(12) 2247-2259 (2015)

Hue selectivity of collinear facilitation

Tomoharu Sato, Takehiro Nagai, and Ichiro Kuriki
J. Opt. Soc. Am. A 37(4) A154-A162 (2020)

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 (5)

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