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The human motion VEP as a function of size and eccentricity of the stimulation field

✍ Scribed by R. Müller; E. Göpfert; L. Schlykowa; D. Anke

Publisher
Springer-Verlag
Year
1990
Tongue
English
Weight
319 KB
Volume
76
Category
Article
ISSN
0012-4486

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✦ Synopsis

A 'motion onset VEP' was elicited by the onset of a pattern drift. The amplitude of the most distinct wave (AN20o) was determined on the following stimulation conditions: eccentricity, 0 to 23 deg; velocity, 1.5 to 16 deg/s; spatial frequency, 0.19 to 2.1 c/deg; and stimulation field size, 0.2 to 160 deg 2 . AN200 remained constant at any degree of eccentricity if stimulation field size, velocity, and spatial frequency were M-scaled according to Rovamo-Virsu's M-equations. A~z00 decreased as a function of eccentricity if field size and velocity were kept constant (spatial frequency had minimal effect). The size of the cortical representation field (So) in this case varied with change in eccentricity (stimulation field size constant). In another experiment, it varied by change in stimulation field size (eccentricity constant). For both conditions, AN200 was proportional to log So.

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