Showing papers by "Dov Sagi published in 1998"
TL;DR: The results suggest that contrast integration is primarily based on local mechanisms and constrained by contour properties and that these local mechanisms are possibly mediated by lateral interactions in the primary visual cortex.
110 citations
TL;DR: The results suggest that spatial filters in early vision retain an input trace far beyond the perceptual integration range, which may subserve the consolidation of filter activity into long-term memory.
50 citations
TL;DR: It is shown that activated neurons in the primary visual cortex retain a near-threshold memory trace that persists until reactivated and is inactivated by presenting high-contrast signals before the target.
Abstract: Detection of a visual signal can be facilitated by simultaneous presentation of a similar subthreshold signal. Here we show that the facilitatory effect of a subthreshold signal can persist for more than 16 s. Presenting a near-threshold Gabor signal (prime) produced a phase-independent increase in contrast sensitivity (40%) to similar successive signals (target) for a period of up to 16 s. This effect was obtained only when both prime and target were presented to the same eye. We further show that the memory trace is inactivated by presenting high-contrast signals before the target. These results suggest that activated neurons in the primary visual cortex retain a near-threshold memory trace that persists until reactivated.
42 citations