Dissociated awareness of manual performance on two different visual associative tasks: a "split-brain" phenomenon in normal subjects?
Subjects performed two visual category matching tasks. One task, shown in previous work to exhibit a left hemisphere superiority, was to decide if two different pictures represented the same object. In this task, verbal corrections of manual responses were usually correct (93%), indicating good verbal awareness of the task. The other task, previously shown to exhibit a right hemisphere superiority, was to decide if two different pictures represented the same emotional facial expression. Here, verbal corrections were random (58%), indicating poor verbal awareness of the task. The apparent dissociation of verbal and manual responses for the emotional expression matching task resembles results obtained with "split brain" patients.
D000328:Adult; D001245:Association Learning; D001364:Awareness; D003071:Cognition; D004193:Discrimination Learning; D004292:Dominance, Cerebral; D005149:Facial Expression; D005556:Form Perception; D006801:Humans; D008297:Male; D009048:Motor Skills; D010364:Pattern Recognition, Visual; D012660:Semantics