Human Ss were exposed to light flashes under passive viewing conditions and under conditions calling for discriminative responses. Average evoked responses and the variances of these AERs were recorded from corresponding areas of the two hemispheres. The major finding is that, under attentive viewing, the two hemispheres respond with nearly equivalent variance whereas, under passive viewing, inter-hemispheric variance is markedly asymmetrical. Implications are discussed briefly.
Get full access to this article
View all access options for this article.
References
1.
DavisH.Enhancement of evoked cortical potentials in humans related to a task requiring a decision. Science, 1964, 145, 182–183.
2.
DonchinE., & LindsleyD. B.Average evoked potentials and reaction times to visual stimuli. EEG clin. Neurophysiol., 1966, 20, 217–223.
3.
HaiderM.SpongP., & LindsleyD. B.Attention, vigilance, and cortical evoked potentials in humans. Science, 1964, 145, 180–182.
4.
MartiniusJ. W., & HooveyZ. B.Bilateral synchrony of occipital alpha waves, occulomotor activity, and “attention” in children. EEG clin. Neurophysiol., 1972, 32, 349–356.
5.
RhodesL. E.DustmanR., & BeckT. C.Visual evoked responses: a comparison of bright and dull children. Paper read at the Western Psychological Association, Cheyenne, Wyoming, 1967.
6.
SatterfieldJ. H.Evoked cortical response enhancement and attention in man EEG clin. In Neurophysiol., 1965, 19, 470–475.
