This investigation focused on two major areas of investigation, (a) the differentiation of functions between the two cerebral hemispheres and (b) the effectiveness of electromyographic biofeedback versus relaxation tape input as methods of lowering levels of arousal. The purpose of the study was to evaluate the differential effects of EMG biofeedback and relaxation tape input to the right ear only, to the left ear only and to both ears in a strongly lateralized population. Subjects were 56 students recruited from undergraduate psychology classes. To be included in the study, subjects had to score at minimum, and Edinburgh Handedness Inventory Laterality Quotient of 68, Declie = Right 3, and had to demonstrate a right ear advantage on the Dichotic Listening Task for Words.