Document Detail

Nonlinearity and oscillations in X-type ganglion cells of the cat retina.
MedLine Citation:
PMID:  8506629     Owner:  NLM     Status:  MEDLINE    
Intracellularly recorded light-responses of X-type ganglion cells in the cat retina were separated, with the help of a wavelet method, into "slow" membrane ("G")-potentials and the corresponding spike trains. In response to sinusoidally modulated high intensity light spots with different sizes and frequencies, X-type ganglion cells show both oscillations correlated with the stimulus frequency and other, faster, oscillations that were not always locked to the stimulus. A forced van der Pol oscillator model with stimulus-dependent coefficients proved to describe the empirical findings quite well. A linearity-coefficient of the equations indicates strong nonlinearity at a temporal frequency of 8 Hz with spot sizes on the order of 0.5-0.7 deg and decreasing nonlinearity at lower temporal frequencies or smaller spot sizes, while the faster oscillations become more prominent. We could not determine whether the oscillations are intrinsic to the cell-membrane or generated by (or in interaction with) the preganglionic retinal meshwork. The results show that X-cell spike-trains can contain oscillations that are not phase-locked to the stimulus and that are therefore virtually invisible after stimulus synchronous averaging. It is not likely that these retinal oscillations directly induce the well described oscillations in cat visual cortex, since they usually fall in a different frequency range.
A W Przybyszewski; M J Lankheet; W A van de Grind
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  33     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1993 May 
Date Detail:
Created Date:  1993-07-08     Completed Date:  1993-07-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  861-75     Citation Subset:  IM    
Utrecht Biophysics Research Institute, The Netherlands.
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MeSH Terms
Action Potentials / physiology
Membrane Potentials / physiology
Models, Neurological
Photic Stimulation
Retinal Ganglion Cells / physiology*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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