Non-classical receptive field (nCRF) effects include several response properties in V1 neurons not explained by a linear-nonlinear (LN) receptive field model, but instead requiring significant interactions between V1 neurons. Using a sparse coding model [1, 2] and bar and grating stimuli, simulated physiology experiments were carried out that replicated several nCRF phenomena reported previously in neurophysiology experiments. These include: end-stopping [3] (Fig. 1), contrast invariance of orientation tuning [4] (Fig. 2), radius, orientation, and contrast tunings of surround suppression [5, 6] (Fig. 3, 4, 5). The results suggest that a sparse coding model can explain many of the nonlinear effects in V1 cells, and is therefore a reasonable candidate for a functional model of striate cortex.
Figure 1
End-stopping. Comparison with a LN model.
Figure 2
Contrast invariance of orientation tuning.
Figure 3
Surround suppression at different contrasts.
Figure 4
Orientation tuning of surround suppression.
Figure 5
Surround orientation influences contrast tuning.
Authors’ Affiliations
(1)
Department of Biomedical Engineering, Georgia Institute of Technology
(2)
Department of Electrical and Computer Engineering, Georgia Institute of Technology
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