ELECTROMYOGRAPHIC GRADIENTS DURING COMPLEX VISUAL DISCRIMINATION LEARNING

Muscle activity levels during cognitive and motor performances recorded from various electrode placements have, in several studies, been shown to follow monotonically rising gradients throughout the experimental task. A complex match-to-sample visual discrimination task employed in this study demonstrated not only a tonic neuromuscular adjustment during performance, but also the occurrence of phasic shifts in activity corresponding to orienting reactions. These phasic responses tend to habituate rapidly with repetitive performance, and are rarely identified in overleamed Ss. © 1969, Psychonomic Journals, Inc.. All rights reserved.