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On and off effects in the background electro encephalogram activity during 1 second photic stimulation



On and off effects in the background electro encephalogram activity during 1 second photic stimulation



Electroencephalography and Clinical Neurophysiology 44(3): 307-316



The changes in .alpha. band power of the background EEG activity during 1 s light stimulation were investigated in 10 normal human subjects. The EEG data were band-pass filtered, centering on the .alpha. range, and the time-dependent power changes were evaluated for their significance. The most significant finding was a light-on power decrease (on-effect) occurring in occipital areas 250-500 ms after onset of the stimulus, observed in all subjects, and reaching values of 72.2 .+-. 13.2% decrease, with reference to power in the pre-stimulus interval. In 8 subjects there was also a significant light-off power decrease occurring 250-500 ms after offset of the photic stimulus (average across subjects: 41.8 .+-. 24.4%) also in the occipital region. Similar on- and off-effects were observed in central regions, with lesser statistical significance. This pattern of light-on and -off power decreases was consistent and reproducible, with small inter- and intraindividual variability.

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