Synchronous neural activity recorded from the round window
- VernacularTitle:耳蜗圆窗记录的蜗神经同步放电活动
- Author:
Zhiwu HUANG
;
Jianhua PENG
;
Zhanyuan WU
;
Zezhang TAO
- Publication Type:Journal Article
- Keywords:
Cochlea;
Cochlea nerve;
Guinea pigs
- From:
Chinese Journal of Pathophysiology
1986;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
AIM: To study the origin of the 1kHz peak of average spectrum electrophysiological cochleoneural activity (ASECA-1kHz),which is related to the firing of auditory neurous-a possible synchronized firing. METHODS: By using the various sound presented either ipsilaterally or contralaterally,the alterations of ASECA-1kHz were detected under the state of awakness. RESULTS: (1) Contralateral stimulation with noise bands at frequencies above 8kHz and below acoustic interaural cross-talk decreased the amplitude of ASECA-1kHz. (2) For the presentations of ipsilaterally noises,when the acoustic bandwidth was above or below 1.5kHz,then produced respectively an increase or a decrease of ASECA-1kHz. (3) Pure tones when presented contralaterally had no detectable effect,but when presented ipsilaterally pure tones with frequencies higher than 4kHz decreased the ASECA-1kHz. Moreover,the detailed time course of sound-induced variations of the 1kHz peak was measured by time averaging,the resulting response patterns were resemblance to PST histogram of the auditory nerve. CONCLUSIONS: The results suggest that the ASECA-1kHz peak in the guinea pig originates from a restricted tonotopic area corresponding to the high frequencies of 12.5-25 kHz and that it should correspond to a synchronized spontaneous firing of fibers.
