Document Detail

The nature of the inputs to cortical motion detectors.
MedLine Citation:
PMID:  7483319     Owner:  NLM     Status:  MEDLINE    
Recently, Jagadeesh, Wheat and Ferster [(1993) Science, 262, 1901-1904] presented intracellular recordings from direction-selective simple cells in primary visual cortex and provided an analysis to support the idea that synaptic summation in simple cells is linear. New analysis presented in this study reveals that: (1) the number of subunits contributing to the analyzed simple cell inputs is two; (2) the subunits are nonlinear in the time domain; (3) each subunit linearly integrates the luminance across the receptive field being, thus, linear to local contrast; (4) the waveforms of the subunit signals are linearly modulated by local contrast at the subunit loci unless the contrast changes its sign; (5) the synaptic summation in the simple cell is linear; (6) nonlinearity of even harmonics has sufficient information for retrieving of relative spatial phase of the subunits and reconstruction of the exact temporal profiles of the subunit signals.
L L Kontsevich
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  35     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1995 Oct 
Date Detail:
Created Date:  1995-12-12     Completed Date:  1995-12-12     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  2785-93     Citation Subset:  IM; S    
Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115, USA.
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MeSH Terms
Factor Analysis, Statistical
Membrane Potentials
Models, Neurological
Motion Perception / physiology*
Neurons, Afferent / physiology*
Visual Cortex / cytology,  physiology*
Grant Support

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