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Japanese

SHORT-LATENCY HUMAN EVOKED RESPONSES TO CLICKS ON RETROAURICULAR REGION Kozo Yajima 1 , Kimikazu Konno 1 , Hachiki Sobue 1 , Osamu Nakai 1 , Osamu Seino 1 1Department of Neurosurgery, Brain Research Institute, Niigata University pp.39-47
Published Date 1972/1/1
DOI https://doi.org/10.11477/mf.1406203044
  • Abstract
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The human average evoked responses to auditorystimuli within 50 msec were recorded from theregion just behind the auricle and the ear lobe.The stimuli were 0. 3 msec pulses from a generator,which were amplified and devered to monoauralheadphone with intensity of about 70-100 dB.Twelve subjects with clinically normal hearing andeleven subjee4 with some lesions in nervous systemwere studied. We obtained the following results.

1) The responses consisted of three waves, posi-tive-negative-positive waves, and each of them wasnamed P1, N1 and P2, respectively. Ni was themost prominent but P1 was small and sometimesfailed.

2) Peak latencies of the response were measuredin 71 experimental sessions in the normal subjects.The values were as follows : P1 9.9±1.0 msec, N114.1±1.4 msec, P2 19.0±2.2 msec on stimulatedside and P1 9.6±1.0 msec, N1 13.7+1.3 msec on the non-stimulated side. N1-P2 amplitudes were0.4-333 μⅤ (mean value : 23.8 μⅤ) ipsilaterally and0.4-738 μⅤ (mean value : 54.2 μⅤ) contralaterally.As the intensity more increased, the peak latenciesof P1 and N1 became shorter and N1-P2 amplitude larger.

3) Twenty-four eares in the twelve normal sub-jects were stimulated. N1-P1 amplitudes on bothsides were compared with each other. The ampli-tudes on both sides were compared with each other. The amplitude was greater in 9 ears ipsilaterallyand in 10 ears contralaterally. There were no dif-ference in 4 ears and no response in one ear.

4) N1-P2 amplitude became larger when theexaminee flexed his neck, clenched his jaw, raisedhis brow, closed his eyes and mouth tightly, graspedhis hands, and calculated mentally, while it becamesmaller when he opened his eyes.

5) During light sleep this amplitude decreasedin one subject.

6) These responses could be detected only onsmall area just behind the auricle.

7) When the electrode was inserted into thetemporal muscle in one case, this response couldnot be detected.

8) In three ceses with facial palsy, these responsesalso existed on the paralytic side. Ni peak latencywas prolonged in two cases of tumor, one wassupratentorial tumor and the other was infratent-orial. In spite of high intensity stimulation to bothsides, no responses were obtained in three caseswith other disordere.

9) From these findings we considered that theorigin of these responses was neither from theinnervated by facial nerve, for example to auriclarmuscle, the stapedial muscle and the tensor tympamimuscle, nor from the temporal muscle and theback neck muscle.


Copyright © 1972, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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