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Spectral Analysis of the Visual Evoked Potential (VEP): Effects of Stimulus Luminance
Author(s) -
Jutai J.W.,
Gruzelier J.H.,
Connolly J.F.
Publication year - 1984
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1984.tb00254.x
Subject(s) - luminance , scalp , stimulus (psychology) , psychology , electroencephalography , audiology , visual n1 , visual evoked potentials , occipital region , visual perception , neuroscience , physics , optics , cognitive psychology , anatomy , medicine , perception
Power spectral analysis was performed on the visual evoked potentials (VEPs) of subjects who had participated in an augmenting‐reducing study. Six flash luminances were used (0.31, 0.65, 1.25, 2.5, 5.0, and 10.0 fL). EEG recordings were taken from C z O 1 , O 2 , T 3 , and T 4 scalp locations. Power in six frequency ranges was examined (0–2, 2–6, 6–10, 10–14, 14–18, and 18–22 Hz). Power in the lowest three frequency ranges increased linearly with stimulus luminance at all electrode sites. Power in the highest three ranges increased linearly with luminance at occipital sites only. Power was greater in the left hemisphere than in the right for 18–22 Hz activity recorded at occipital locations. The reverse asymmetry occurred for 6–14 Hz activity recorded at temporal locations. The results suggest that individual differences in stimulus control in EEG recordings taken from scalp locations overlying nonspecific cortex are due primarily to the contributions of higher frequency components of the VEP spectrum. A thalamo‐cortical model of stimulus control is described.