Abstract
We present a three-layer feedforward visual pathway model consisting of retina, LGN and cortex for development of orientation selectivity in layer 4 simple cells. Receptive field (RF) development in the model, is determined by diffusive cooperation and resource limited competition guided axonal growth and retraction in geniculocortical pathway. The simulated cortical RFs resemble experimental RFs. In the feed forward model when only the linear contribution from LGN was considered we obtained a mean hwhh (half width at half the maximum response) of 58°. The mean hwhh improved to 37° when nonlinearity in spiking mechanism was incorporated. The hwhh in the cells improved by another 9° when a push-pull effect was included. The tuning in the simulated cells matches reported tuning in layer 4 simple cells.
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