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Journal of Neuroscience, Vol 14, 2069-2079, Copyright © 1994 by Society for Neuroscience
Magnocellular and parvocellular contributions to the responses of neurons in macaque striate cortex
TA Nealey and JH Maunsell
Department of Physiology, University of Rochester, New York 14642-8642.
Anatomical and physiological studies of the primate visual system have
suggested that the signals relayed by the magnocellular and parvocellular
subdivisions of the LGN remain segregated in visual cortex. It has been
suggested that this segregation may account for the known differences in
visual function between the parietal and temporal cortical processing
streams in extrastriate visual cortex. To test directly the hypothesis that
the temporal stream of processing receives predominantly parvocellular
signals, we recorded visual responses from the superficial layers of V1
(striate cortex), which give rise to the temporal stream, while selectively
inactivating either the magnocellular or parvocellular subdivisions of the
LGN. Inactivation of the parvocellular subdivision reduced neuronal
responses in the superficial layers of V1, but the effects of magnocellular
blocks were generally as pronounced or slightly stronger. Individual
neurons were found to receive contributions from both pathways. We
furthermore found no evidence that magnocellular contributions were
restricted to either the cytochrome oxidase blobs or interblobs in V1.
Instead, magnocellular signals made substantial contributions to responses
throughout the superficial layers. Thus, the regions within V1 that
constitute the early stages of the temporal processing stream do not appear
to contain isolated parvocellular signals. These results argue against a
direct mapping of the subcortical magnocellular and parvocellular pathways
onto the parietal and temporal streams of processing in cortex.
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