Journal
VISION RESEARCH
Volume 49, Issue 14, Pages 1711-1716Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.visres.2009.03.021
Keywords
Multifacal visual evoked potential; mfVEP; Contrast; Retinal eccentricity; Contrast response function
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Funding
- NEI NIH HHS [P30 EY07751, P30 EY007551-20, P30 EY007551, P30 EY007551-21] Funding Source: Medline
- PHS HHS [T35 007088] Funding Source: Medline
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mfVEPs were recorded with a 22 degrees radius, 60 sector pattern reversal dartboard stimulus (VERIS) at six contrast levels (10%, 25%, 35%, 50%, 75%, 95%). Contrast response functions (CRFs) based on response amplitudes were adequately described by a simple hyperbolic function. The effect of reducing contrast on the amplitude was most apparent in the central 1 degrees radius, which had a C-50 (contrast at 50% of the maximum response) in excess of 50%, compared to values for C-50 in more eccentric regions that were 30% or lower. Mean latency increased 6 (+/- 0.7SE) ms from the highest to the lowest contrast tested, and did not vary significantly with eccentricity. (C) 2009 Published by Elsevier Ltd.
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