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Sixty-four 5s used their right hand to move a control handle to the right or left from the midline of the body depending on the ear in which they heard a 1,000cps tone. The 5s moved the handle toward the side of the ear stimulated for one block of SO trials (25 to each ear in a random sequence) and away from the side of the ear stimulated for another block. Reactions toward the stimulus source were significantly faster than reactions away. Reaction time was faster for reactions to the right, while movement time was faster for movements to the left.

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In a choice RT task, 64 Ss pressed either a right-or left-hand key in response to directional commands provided by 400 and 1000 cps tones. On monaural trials, RT was significantly faster when the meaning of the tonal command corresponded with the ear in which it was heard (corresponding trials) than when it did not (noncorresponding trials). A comparison of monaural with binaural RT indicated that this Tonal Command X Ear Stimulated interaction was due to interference on the noncorresponding monaural trials rather than facilitation on the corresponding trials.

This paper is based on a thesis completed by the first author under the direction of the second author and submitted to the University of Iowa in partial fulfillment of the requirements of the MA degree.2 Requests for reprints should be sent to cither

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