Abstract：
:The dynamic properties of single olivocochlear efferent neurones in the guinea pig cochlea were examined using sinusoidally amplitude modulated (AM) pure tones. The neural discharge, when displayed as a cyclic histogram, clearly followed the rapid fluctuations in the continuous input sound. Modulation transfer functions (MTFs) were constructed and in most cases showed a peak in the modulation response (MR) at a modulation frequency (MF) of 100 Hz. At this frequency a gain of as much as 12 dB was evident relative to the 30% modulated input signal. In 24% of neurones however, a large MR was present even at low MFs. This plurality of MTFs may be the result of recorded neurones emanating from a variety of cell bodies of origin. Efferent group delays (mean of 8.2 +/- 1.0 ms) were shorter and more tightly distributed than the minimum onset latency measurements (mean of 24.2 +/- 12.5) made on the same neurones. It seems evident that a post-synaptic potential build is required from the onset of a stimulus to the first spike discharge. This may occur within a single afferent-interneurone(s)-efferent reflex arc. Among a variety of alternative explanations, the observation is consistent with the notion that the olivocochlear neurones receive facilitatory input from higher centres, which is suppressed under barbiturate anaesthesia. Continuous AM signals may allow post-synaptic build up and eliminate the dependence on this higher input and hence yield a short group delay.
journal_name
Hear Resjournal_title
Hearing researchauthors
Gummer M,Yates GK,Johnstone BMdoi
10.1016/0378-5955(88)90136-0subject
Has Abstractpub_date
1988-10-01 00:00:00pages
41-51issue
1eissn
0378-5955issn
1878-5891pii
0378-5955(88)90136-0journal_volume
36pub_type
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