ADAPTATION, SATURATION, AND PHYSIOLOGICAL MASKING IN SINGLE AUDITORY-NERVE FIBERS
ADAPTATION, SATURATION, AND PHYSIOLOGICAL MASKING IN SINGLE AUDITORY-NERVE FIBERS
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DOI：
10.1121/1.382260
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发表时间：
1979-01-01
影响因子：
2.4
通讯作者：
SMITH, RL
中科院分区：
文献类型：
--
作者：
SMITH, RL
回顾了短期调节刺激的单位特征频率对刺激前和刺激后测试音的反应的一些影响。现象学方程是根据刺激后结果得出的，并且与刺激前结果一致。根据结果和方程，对测试音调的响应等于未调节或未适应的响应减去因适应调节音调而产生的减量。该减量与对调节音调的驱动响应成比例，并且不依赖于声音强度本身。该方程对级联的 2 个过程有一个简单的解释，即静态饱和非线性和加性自适应。结果表明，该功能模型足以解释宽带背景产生的生理掩蔽。根据这种解释，足够强的背景会产生饱和度。叠加的测试音不会导致响应发生变化。此外，当背景出现先于测试音调出现时，总发射率会因适应而降低。审查了有关模型中的变量与听觉外围细胞内事件之间可能对应关系的证据。
Some effects, at a unit''s characteristic frequency of a short-term conditioning stimulus on the responses to prestimulatory and poststimulatory test tones were reviewed. A phenomenological equation is developed from the poststimulatory results and is consistent with the prestimulatory results. According to the results and equation, the response to a test tone equals the unconditioned or unadapted response minus the decrement produced by adaptation to the conditioning tone. The decrement is proportional to the driven response to the conditioning tone and does not depend on sound intensity per se. The equation has a simple interpretation in terms of 2 processes in cascade, a static saturating nonlinearity followed by additive adaptation. Results are presented to show that this functional model is sufficient to account for the physiological masking produced by wide-band backgrounds. According to this interpretation, a sufficiently intense background produces saturation. A superimposed test tone causes no change in response. In addition, when the onset of the background precedes the onset of the test tone, the total firing rate is reduced by adaptation. Evidence is reviewed concerning the possible correspondence between the variables in the model and intracellular events in the auditory periphery.