ヒダカ　ヒロシ   HIDAKA HIROSHI   日高　浩史    所属   関西医科大学  耳鼻咽喉科・頭頸部外科学講座    職種   准教授
論文種別	原著(症例報告除く)
言語種別	英語
査読の有無	査読あり
表題	Frequency summation observed in the human acoustic reflex.
掲載誌名	正式名：Hearing research 略　 称：Hear Res ISSNコード：03785955
出版社	Elsevier
巻・号・頁	108(1-2),pp.37-45
総ページ数	9
著者・共著者	Kawase T, Hidaka H, Takasaka T.
担当区分	2nd著者
発行年月	1997/06
概要	It is known that the threshold of an acoustically induced middle-ear-muscle (MEM) reflex can be lowered by the simultaneous presentation of a second tone (facilitator), which is presented to the ipsilateral or contralateral ear at a level below the acoustic reflex threshold (ART) of the facilitator itself (Sesterhenn and Breuninger, 1976; Blood and Greenberg, 1981). In the present study, a primary elicitor and a facilitator were presented to the ear contralateral to that used for measurement of the acoustic reflex (AR), and the effects of changing frequencies and sound levels of the facilitator were investigated in human subjects with normal ears. The sound levels of facilitators, which caused a significant reduction of ART for the primary elicitors (facilitation thresholds), showed an asymmetrical pattern as a function of frequency of the facilitators. The facilitation thresholds tended to be lower when a facilitator with a frequency lower than the frequency of the elicitor (1 kHz) was used. In addition, effects of the elicitor on the masked thresholds of the facilitator were examined to observe the possible interaction between elicitor and facilitator from the viewpoint of 'spread of excitation'. The underlying mechanism of summation effects of two tones are discussed based on the possible input mechanism involved in the acoustically induced MEM reflex arc.
researchmap用URL	https://researchmap.jp/hirohiro1112/