Biology – Quantitative Biology – Neurons and Cognition
Scientific paper
2005-04-20
Biology
Quantitative Biology
Neurons and Cognition
Scientific paper
Neural mechanisms of extraclassical receptive field phenomena in V1 are commonly assumed to result from long-range lateral connections and/or extrastriate feedback. We address two such phenomena: surround suppression and contrast dependent receptive field size. We present rigorous computational support for the hypothesis that the phenomena largely result from local short-range (< 0.5 mm) cortical connections and LGN input. Surround suppression in our simulations results from (A) direct cortical inhibition or (B) suppression of recurrent cortical excitation, or (C) action of both these mechanisms simultaneously. Mechanisms B and C are substantially more prevalent than A. We observe an average growth in the range of spatial summation of excitatory and inhibitory synaptic inputs for low contrast. However, we find this is neither sufficient nor necessary to explain contrast dependent receptive field size, which usually involves additional changes in the relative gain of these inputs.
Sajda Paul
Wielaard Jim
No associations
LandOfFree
Extraclassical receptive field phenomena & short-range connectivity in V1 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Extraclassical receptive field phenomena & short-range connectivity in V1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extraclassical receptive field phenomena & short-range connectivity in V1 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-516244