Hemispheric asymmetrics between unilateral and bilateral presentations of a letter classification task

This study investigated the hypothesis that bilateral stimulation of the cortex would facil_tate the performance of a letter matching task as compared to unilateral stimulation.Furthermore, the study expected to observe a RVH superiority for a NI letter match and a LVH superiority for making a PI letter match as observed in an earlier study (Cohen, 1972). These results were not found. The only conclusive result found was that the NI letter match was a more difficult match to make than any of .he other letter matches. Possible sources for this factcr were discussed.