dorsal/arxiv
View SchemaExtraclassical receptive field phenomena & short-range connectivity in V1
| Authors | Jim Wielaard, Paul Sajda |
|---|---|
| Categories | |
| ArXiv ID | q-bio/0504027 |
| URL | https://arxiv.org/abs/q-bio/0504027 |
Abstract
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.
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"abstract": "Neural mechanisms of extraclassical receptive field phenomena in V1 are\ncommonly assumed to result from long-range lateral connections and/or\nextrastriate feedback. We address two such phenomena: surround suppression and\ncontrast dependent receptive field size. We present rigorous computational\nsupport for the hypothesis that the phenomena largely result from local\nshort-range (\u003c 0.5 mm) cortical connections and LGN input. Surround suppression\nin our simulations results from (A) direct cortical inhibition or (B)\nsuppression of recurrent cortical excitation, or (C) action of both these\nmechanisms simultaneously. Mechanisms B and C are substantially more prevalent\nthan A. We observe an average growth in the range of spatial summation of\nexcitatory and inhibitory synaptic inputs for low contrast. However, we find\nthis is neither sufficient nor necessary to explain contrast dependent\nreceptive field size, which usually involves additional changes in the relative\ngain of these inputs.",
"arxiv_id": "q-bio/0504027",
"authors": [
"Jim Wielaard",
"Paul Sajda"
],
"categories": [
"q-bio.NC",
"q-bio.QM"
],
"title": "Extraclassical receptive field phenomena \u0026 short-range connectivity in V1",
"url": "https://arxiv.org/abs/q-bio/0504027"
},
"schema_id": "dorsal/arxiv",
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