2-TONE RATE SUPPRESSION IN AUDITORY-NERVE FIBERS - DEPENDENCE ON SUPPRESSOR FREQUENCY AND LEVEL

被引:119
作者
DELGUTTE, B
机构
[1] MIT, ELECTR RES LAB, CAMBRIDGE, MA 02139 USA
[2] HARVARD UNIV, SCH MED, DEPT OTOLARYNGOL, BOSTON, MA 02115 USA
关键词
Auditory nerve; Cochlear nonlinearities; Masking; Peripheral auditory models; Two-tone suppression;
D O I
10.1016/0378-5955(90)90106-Y
中图分类号
R36 [病理学]; R76 [耳鼻咽喉科学];
学科分类号
100104 ; 100213 ;
摘要
The growth of two-tone rate suppression with suppressor level was studied for auditory-nerve fibers in anesthetized cats. The level of a tone at the characteristic frequency (CF) was adjusted by an adaptive procedure (PEST) so that, when presented with a suppressor tone, the CF tone would produce a criterion discharge rate. Suppression (in dB) was defined as the CF-tone level that met criterion in the presence of a suppressor minus the level that met criterion in quiet. The growth of suppression with suppressor level was well characterized by a straight line whose slope (in dB-excitor/dB-suppressor) varied with suppressor frequency by as much as a factor of 10 in the same fiber. These slope differences were systematically related to the position of the suppressor frequency relative to the fiber CF: for below-CF suppressors, slopes ranged from 1 to 3 dB/dB, while, for above-CF suppressors, they were between 0.15 and 0.7 dB/dB. Slopes decreased rapidly with increasing suppressor frequency near the CF, but, for frequencies well below the CF, the slope reached a maximum that increased gradually with CF. These results resemble psychophysical data on the growth of masking and psychophysical suppression and pose difficulties for existing models of two-tone suppression. © 1990.
引用
收藏
页码:225 / 246
页数:22
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