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Two Functional Channels from Primary Visual Cortex to Dorsal Visual Cortical Areas
N. Harumi Yabuta,Atomu Sawatari,*Edward M. Callaway
Relationships between the M and P
retino-geniculo-cortical visual pathways and "dorsal" visual areas
were investigated bymeasuring the sources of local excitatory input to
individualneurons in layer 4B of primary visual cortex. We found that
contributionsof the M and P pathways to layer 4B neurons are dependent
on celltype. Spiny stellate neurons receive strong M input through
layer4C and no significant P input through layer 4C. In
contrast,pyramidal neurons in layer 4B receive strong input from both
layers4C and 4C. These observations, along with evidence that
directinput from layer 4B to area MT arises predominantly from spinystellates, suggest that these different cell types constitutetwo
functionally specialized subsystems.
Systems Neurobiology Laboratories, Salk Institute for Biological
Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
*
Present address: Department of Neurobiology, Harvard Medical
School, 220 Longwood Avenue WAB227, Boston, MA 02115, USA.
To whom correspondence should be addressed. E-mail:
callaway{at}salk.edu
and no significant P input through layer 4C
. In
contrast, pyramidal neurons in layer 4B receive strong input from both
layers 4C
