Comparison among some models of orientation selectivity

Journal of Neurophysiology
Andrew F Teich, Ning Qian

Abstract

Several models exist for explaining primary visual cortex (V1) orientation tuning. The modified feedforward model (MFM) and the recurrent model (RM) are major examples. We have implemented these two models, at the same level of detail, alongside a few newer variations, and thoroughly compared their receptive-field structures. We found that antiphase inhibition in the MFM enhances both spatial phase information and orientation tuning, producing well-tuned simple cells. This remains true for a newer version of the MFM that incorporates untuned complex-cell inhibition. In contrast, when the recurrent connections in the RM are strong enough to produce typical V1 orientation tuning, they also eliminate spatial phase information, making the cells complex. Introducing phase specificity into the connections of the RM (as done in an original version of the RM) can make the cells phase sensitive, but the cells show an incorrect 90 degrees peak shift of orientation tuning under opposite contrast signs. An inhibition-dominant version of the RM can generate well-tuned cells across the simple-complex spectrum, but it predicts that the net effect of cortical interactions is to suppress feedforward excitation across all orientations in simple ...Continue Reading

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Citations

Jun 12, 2012·Journal of Computational Neuroscience·I-Chun LinRobert Shapley
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