Document Detail

Flicker electroretinograms: a systems analytic approach.
MedLine Citation:
PMID:  1584548     Owner:  NLM     Status:  MEDLINE    
We observed multiple maxima and minima in the electroretinogram (ERG) first harmonics which varied as a function of adaptation level, mean illuminance, and modulation depth. Based on differences in response characteristics we identified a minimum of 3 parallel mechanisms operating at 3 frequency regions within the ERG: a low frequency region (less than 10 Hz), a midfrequency region (centered near 20 Hz), and a high frequency region (centered near 40 Hz). The low frequency region was observed both in dark- and light-adapted conditions, was basically linear, and showed nonlinear behavior only at high contrasts in either light or dark adaptation. It may be modeled as a low pass filter. The midfrequency region was clearly observed only above cone threshold, was nonlinear at low contrasts, and may be modeled as a linear filter followed by an essential nonlinearity. The high frequency region was observed under high levels of light adaptation and also was nonlinear at low contrast. It may be modeled also as a linear filter followed by an essential nonlinearity.
J V Odom; D Reits; N Burgers; F C Riemslag
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  69     ISSN:  1040-5488     ISO Abbreviation:  Optom Vis Sci     Publication Date:  1992 Feb 
Date Detail:
Created Date:  1992-06-15     Completed Date:  1992-06-15     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  106-16     Citation Subset:  IM    
Department of Visual Systems Analysis, The Netherlands Ophthalmic Research Institute, Amsterdam.
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MeSH Terms
Dark Adaptation
Flicker Fusion / physiology*
Photic Stimulation
Retina / physiology*
Sensory Thresholds

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

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