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- U. Bauer, M. Scholz, J. B.
Levitt, J. S. Lund, and K. Obermayer. Influence of Recurrent Excitation
and Inhibition on Receptive Field Size and Contrast Sensitivity in Layer 4C
of Macaque Striate Cortex.
.
In W. Gerstner, A. Germond, M. Hasler, and J. Nicoud, editors, Artificial
Neural Networks - ICANN 98, volume 2, pages 949-954. Springer-Verlag,
1998.
(FTP Gzipped PostScript, 6 pages, 80 kb)
Neurons in layer 4C in macaque striate cortex show an increase in
receptive fileld size and achromatic contrast sensitivity from the bottom to
the top of the layer. Using a computational model which is based on realistic
anatomical and physiological data we demonstrate that part of the observed
changes can arise from differences in the overall balance between recurrent
excitation and lateral inhibition from two different neuron types. The model
predicts that - given the above hypotheses - lateral recurrent excitation
must come from an increasingly wider range with rise in depth of layer 4C,
and lateral inhibition must have higher threshold and gain in upper 4C alpha.
The anatomical substrate of recurrent excitation are the stepped projections
of spiny stellate cells. As the possible anatomical substrate of differential
inhibition we suggest the clutch cell in lower and mid 4C and the alpha-6
(Lund 1987) cell in upper 4C alpha which replaces the clutch cell as a
somatic inhibitor.
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