Bilateral hemispheric alpha activity during visual imagery

Subjects responded to questions designed to be answered with or without accompanying visual imagery, while saccadic eye movements and temporoparietal EEG were recorded. Findings of suppressed eye-movement rate and suppressed alpha output during response to the high-imagery questions were interpreted as evidence of the presence of visual imagery. However, the interaction between Question Type and Hemisphere was not significant, indicating equal effect of visual imagery on alpha activity in the two hemispheres, contrary to the popular belief that visual imagery is a function of the right cerebral hemisphere.