STEADY-STATE VISUAL EVOKED RESPONSES IN HIGH AND LOW ALPHA SUBJECTS

Authors
  1. Pigeau, R.
  2. Frame, A.M.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Reactivity to photic stimulation was studied in 16 subjects who were divided into 2 groups based on the relative amounts of spontaneous EEG alpha produced during a 4 min eyes-closed baseline condition. During the experimental session the subjects were presented with thirteen 1 min periods of sinusoidally modulated light stimulation at frequencies rangining from 2 Hz below their spontaneous peak alpha frequency (SPAF) to 2 Hz above in 0.33 Hz intervals. Using FFTs, steady-state visual evoked responses (VERs) were extracted from each subject's EEG for each condition. VER magnitude for high alpha subjects varied with the proximity of the stimulus frequency to the SPAF, the VER for low alpha subjects did not. Conversely, low alpha subjects showed a similar effect in side-band alpha activity (once the VER had been extracted) whereas high alpha subjects did not. The results are explained in terms of a possible difference in the coupling strength between thalamic and cortical alpha sources.
Report Number
DCIEM-91-15 — Reprint
Date of publication
19 Oct 1991
Number of Pages
8
Reprinted from
Electroencephalography and Clinical Neurophysiology, vol 84, 1992, p 101-109
DSTKIM No
93-04488
CANDIS No
134686
Format(s):
Hardcopy;Originator's fiche received by DSIS

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