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Journal of Neuroscience, Vol 9, 2033-2050, Copyright © 1989 by Society for Neuroscience
Afferent basis of visual response properties in area MT of the macaque. I. Effects of striate cortex removal
HR Rodman, CG Gross and TD Albright
Department of Psychology, Princeton University, New Jersey 08544.
The middle temporal area (MT) of the macaque monkey is a region of
extrastriate cortex involved in the analysis of visual motion. MT receives
strong projections from striate cortex and from area V2, which is dependent
on striate for visual responsiveness. Accordingly, the visual properties of
MT neurons have been thought to reflect the further processing of its input
from striate cortex. We examined the dependence of MT activity on pathways
deriving from striate cortex by recording from MT neurons following removal
of their striate input. Repeated recordings in area MT were made in 4
hemispheres of anesthetized macaques following either partial or total
ablations of striate cortex. Cells in MT were tested for responsiveness,
selectivity for direction of motion and direction tuning, and ocular
dominance. Receptive fields were also plotted. In an additional animal, we
recorded from MT neurons during reversible cooling of the central
representation in striate cortex. We found that striate cortex removal or
inactivation did not abolish the visual responsiveness of the majority of
MT cells. Although the residual responses were generally much weaker than
in the intact animal, direction selectivity and binocularity were still
present. Moreover, receptive field size and overall topography appeared
unaltered.
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