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Science 29 January 1999: Vol. 283. no. 5402, pp. 695 - 699 DOI: 10.1126/science.283.5402.695
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Reports
Horizontal Propagation of Visual Activity in the Synaptic Integration Field of Area 17 Neurons
Vincent Bringuier,
*
Frédéric Chavane,
Larry Glaeser,
Yves Frégnac
The receptive field of a visual neuron is classically defined as
the region of space (or retina) where a visual stimulus evokes a change
in its firing activity. At the cortical level, a challenging issue
concerns the roles of feedforward, local recurrent, intracortical, and
cortico-cortical feedback connectivity in receptive field properties.
Intracellular recordings in cat area 17 showed that the visually evoked
synaptic integration field extends over a much larger area than that
established on the basis of spike activity. Synaptic depolarizing
responses to stimuli flashed at increasing distances from the center of
the receptive field decreased in strength, whereas their onset latency
increased. These findings suggest that subthreshold responses in the
unresponsive region surrounding the classical discharge field result
from the integration of visual activation waves spread by slowly
conducting horizontal axons within primary visual cortex.
Equipe Cognisciences, Institut Alfred Fessard, CNRS, Avenue de la
Terrasse, 91198 Gif-sur-Yvette, France.
*
Present address: Neurobiology Division, Medical Research Council
LMB, 2 Hills Road, Cambridge CB22QH, UK.
To whom correspondence should be addressed. E-mail:
yves.fregnac{at}iaf.cnrs-gif.fr
Read the Full Text
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