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The effect of spatial frequency and contrast on the latency in the visual evoked potential

✍ Scribed by Peter Jakobsson; Björn Johansson

Publisher
Springer-Verlag
Year
1992
Tongue
English
Weight
424 KB
Volume
79
Category
Article
ISSN
0012-4486

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✦ Synopsis

The latency in the visual evoked potential was measured at spatial frequencies of 2-12 c/deg in 10 subjects. The contrast levels of the sinuosoidal grating patterns were set at 1.5, 1.75, 2.0, 2.25, 2.5, 2.75 and 3.0 log units above each subject's contrast sensitivity threshold. Two factors were shown to influence the latency: suprathreshold contrast and, to a lesser extent, spatial frequency. The visual evoked potential latencies at contrast sensitivity threshold were extrapolated. These threshold latencies showed considerable variation with spatial frequency and between subjects. Therefore, the visual evoked potential latency cannot be considered a useful tool for estimating the contrast sensitivity function.

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