Cerebral Cortex, Vol 7, 662-677, Copyright © 1997 by Oxford University Press
DK Xiao, S Raiguel, V Marcar and GA Orban
The majority (217/325, 66%) of the neurons in the middle temporal (MT)
area/V5 show strong antagonistic surrounds, defined here by a decrease of
at least 50% in the summation curve. We mapped the antagonistic surround in
145 such cells, using eight circularly distributed surround stimulus
patches (Surround Asymmetry Test, SAT) and also mapped the surround in 51
of these 145 cells using a grid consisting of 25 square patches (Surround
Mapping Test, SMT). Both tests showed that the angular surround
distribution was non-uniform in the majority of these neurons. In half the
neurons, the antagonistic surround was asymmetric, and arose from a single
region on one side of the excitatory receptive field (ERF). In another
quarter of the sample the surround was bilaterally symmetric, and arose
from a pair of regions on opposite sides of the ERF. Only the remaining 20%
showed a circularly symmetric surround distribution. These three groups
differed in their laminar distribution. The SMT showed that, radially, the
surround antagonism reached a maximum, on average, at 1.5 times the ERF
radius. Detailed comparisons of the spatial relationships of excitatory and
inhibitory regions of the RF components shows that non-homogeneity of the
surround influence appears to be an intrinsic property of the surround.
Such a property may underly the extraction of the surface orientation and
curvature from speed patterns.
ARTICLES
The spatial distribution of the antagonistic surround of MT/V5 neurons
Laboratorium voor Neuro- en Psychofysiologie, Katholieke Universiteit Leuven, School of Medicine, Campus Gasthuisberg, Belgium.
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