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The purpose of this paper was to study the relationship between the first and the second resp-onse to the paired tone stimuli, in order to apply the paired tone to evoked response audiometry (E.R.A.).Thirteen subjects with normal hearing were studied (10 women and 3 men). The acoustic stimuli were tone bursts of loomsec. duration with rise and decay time of 10msec. at 1KHz, prese-nted every 2sec. (in 13 cases) or 7sec. (10 cases) monaurally by an earphone.The paired tone intervals were of four kinds: l00msec., 200msec., 300msec. and 400msec. The intensities of the stimulating tones were from 30dB to 70dB above subjective thresholds. N1-P2 amplitudes of the responses and peak latencies of N1 were measured.The following conclusions were obtained:1) In most cases, the wave forms in response to each of the paired tone stimuli with 100msec.intervals were not observed separately, because the first and the second response were piled up partly. The two wave forms could be observed complely in response to the paired tone stimuli with intervals over 200msec.2) The N1 peak latencies of the response to the first tones were decreased and the N1-P2 ampli-tude were increased with increasing stimlus intensity of the first tones.3) The n1 peak latencies of the resonses to the second tone were about 10-20msec. shorter than the one to the first tone and n1-p2 amplitude of the second response was small compared with the Nl P2 amplitude of the first response.4) The Nl P2 amplitude of the response to the first tone was decreased as the intensity of the second stimulating tones increased.5) The n1-p2 amplitude of the second response was larger, only when the first stimulating tones were lower than the second.6) We are interested in the fact that the N1-P2 amplitude of the response to the first tone was decreased as the intensity of the second stimulating tones increased, however the reason why this phenomen ocurred was still unknown. The paired tones may produce a mechanism of a kind of the condi tional response, which ; differs from the response to the single acoustic stimuli. We concluded that the paired tone stimuli could not be applied into clinical test at present.

EVOKED RESPONSES TO PAIRED TONE STIMULI