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On the Anatomical Basis of Field Size, Contrast Sensitivity, and Orientation Selectivity in Macaque Striate Cortex: A Model Study
Citation key Bauer1997a
Author Bauer, U. and Adorjan, P. and Scholz, M. and Levitt, J.B. and Lund, J.S., and Obermayer, K.
Title of Book Artificial Neural Networks - ICANN 97
Pages 213 – 218
Year 1997
ISBN 978-3-540-63631-1
ISSN 0302-9743
DOI 10.1007/BFb0020158
Note 7th International Conference Lausanne, Switzerland, October 8–10, 1997 Proceeedings
Editor W. Gerstner and A. Germond and M. Hasler and J. Nicoud
Publisher Springer-Verlag
Series Lecture Notes in Computer Science
Abstract Neurons in layer 4C in macaque striate cortex show a differential change in receptive field size and achromatic contrast sensitivity with depth, and exhibit orientation selective responses in the upper 4Calpha sublayer. Using a computational model we first demonstrate that the observed change in receptive field size and contrast sensitivity can arise from a differential convergence of afferents from the P and M sub divisions of the lateral geniculate nucleus on to layer 4C spiny stellate cells - if one postulates that the two anatomically identified M1 and M2 subpopulations of the M afferents differentially project to different depth in the 4Calpha subdivision. Number ratios and response properties of both M subpopulations are predicted and may now be tested experimentally. We then show that realistic orientation selective responses in upper 4Calpha can emerge in tracortically as a result of local lateral interactions, which are anisotropic, between spiny stellate cells and inhibitory interneurons. The model assumes that orientation bias and tuning are generated by the same cortical circuits and predicts a receptive field dynamics with an initial non orientation specific response.
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