A model of visual cortical temporal frequency tuning

被引:3
作者
Krukowski, AE [1 ]
Troyer, TW [1 ]
Miller, KD [1 ]
机构
[1] Univ Calif San Francisco, WM Keck Ctr Integrat Neurosci, Sloan Ctr Theoret Neurobiol, Dept Physiol,Grad Grp Biophys, San Francisco, CA 94143 USA
关键词
NMDA; LGN; striate cortex; inhibition; cat;
D O I
10.1016/S0925-2312(01)00499-4
中图分类号
TP18 [人工智能理论];
学科分类号
081104 ; 0812 ; 0835 ; 1405 ;
摘要
There are several response properties that distinguish cortical simple cells of cat Vf. layer 4 from the geniculate cells that provide their input. We have recently demonstrated that a developmentally motivated pattern of intracortical inhibition, in conjunction with the observed pattern of geniculocortical connections, can robustly account for the contrast-invariance of simple cell orientation tuning. We now show that this same model circuit unexpectedly accounts for the low-pass shift in the temporal frequency tuning curves of cortical cells relative to geniculate cells. This arises when NMDA-mediated excitatory conductances are included in the thalamocortical synapses, at levels observed experimentally. (C) 2001 Published by Elsevier Science B.V.
引用
收藏
页码:1379 / 1383
页数:5
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