Abstract
The primary aim of this study was to evaluate the reliability with which several stereotyped ‘left’ and ‘right’ brain tasks did in fact differentially engage the appropriate cerebral hemisphere. Activity was monitored at four electrode sites and power in the α waveband (8–13 Hz) was compared. The consistency of task induced effects was examined by standard statistical measures of reliability. The presence of task related differences in cerebral activity received some support. Reliability measures in addition showed an interesting high correlation with the index of hemispheric involvement. Right brain tasks induced an effect which was more consistent across subjects than that induced by left brain tasks. The result is interpreted as suggesting a difference in the variety of cognitive strategies applicable to left or right brain tasks.
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