Abstract:
:Following a flashed stimulus, I show that a simple neurophysiological mechanism in the primary visual system can generate orientation selectivity based on the first incoming spikes. A biological model of the lateral geniculate nucleus generates an asynchronous wave of spikes, with the most strongly activated neurons firing first. Geniculate activation leads to both the direct excitation of a cortical pyramidal cell and disynaptic feed-forward inhibition. The mechanism provides automatic gain control, so the cortical neurons respond over a wide range of stimulus contrasts. It also demonstrates the biological plausibility of a new computationally efficient neural code: latency rank order coding.
journal_name
J Comput Neuroscijournal_title
Journal of computational neuroscienceauthors
Delorme Adoi
10.1023/a:1027420012134subject
Has Abstractpub_date
2003-11-01 00:00:00pages
357-65issue
3eissn
0929-5313issn
1573-6873pii
5252210journal_volume
15pub_type
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