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Journal of Neuroscience, Vol 10, 1154-1164, Copyright © 1990 by Society for Neuroscience
Afferent basis of visual response properties in area MT of the macaque. II. Effects of superior colliculus removal
HR Rodman, CG Gross and TD Albright
Department of Psychology, Princeton University, New Jersey 08544.
In a previous study (Rodman et al., 1989), we found that many neurons in
the middle temporal area (MT) of the macaque monkey remain visually
responsive and directionally selective after striate cortex lesions or
cooling. In the present study, we examined the effects of superior
colliculus (SC) lesions and combined lesions of striate cortex and the SC
on the visual properties of MT neurons. Removal of the SC alone had no
effect on the proportion of visually responsive cells, strength of
direction selectivity and direction tuning, orientation tuning, receptive
field size, or binocularity in MT. There was, however, a slight increase in
response strength to both stationary and moving slit stimuli. In contrast
to the minor effects of SC lesions alone, addition of an SC lesion to
striate cortex damage abolished all visual responsiveness in area MT. The
results indicate that pathways damaged by the SC lesion are not necessary
for most of the properties of MT neurons found in the intact animal,
although these pathways are capable of sustaining considerable visual
responsiveness and direction selectivity when striate input is removed.
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