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Journal of Neuroscience, Vol 15, 1605-1615, Copyright © 1995 by Society for Neuroscience
The neurophysiology of figure-ground segregation in primary visual cortex
VA Lamme
Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139.
The activity of neurons in the primary visual cortex of the awake macaque
monkey was recorded while the animals were viewing full screen arrays of
either oriented line segments or moving random dots. A square patch of the
screen was made to perceptually pop out as a circumscribed figure by virtue
of differences between the orientation or the direction of motion of the
texture elements within that patch and the surround. The animals were
trained to identify the figure patches by making saccadic eye movements
towards their positions. Almost every cell gave a significantly larger
response to elements belonging to the figure than to similar elements
belonging to the background. The figure- ground response enhancement was
present along the entire extent of the patch and was absent as soon as the
receptive field was outside the patch. The strength of the effect had no
relation with classical receptive field properties like orientation or
direction selectivity or receptive field size. The response enhancement had
a latency of 30-40 msec relative to the onset of the neuronal response
itself. The results show that context modulation within primary visual
cortex has a highly sophisticated nature, putting the image features the
cells are responding to into their fully evaluated perceptual context.
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