Exploring the role of feedback-based auditory reflexes in forward masking by schroeder-phase complexes.
Exploring the role of feedback-based auditory reflexes in forward masking by schroeder-phase complexes.
复制标题
探索基于反馈的听觉反射在施罗德相位复合体前向掩蔽中的作用。
DOI：
10.1007/s10162-014-0495-3
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Oxenham,AndrewJ
中科院分区：
文献类型：
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作者：
Wojtczak,Magdalena;Beim,JordanA;Oxenham,AndrewJ
一些研究假设听觉感知的心理声学测量受到耳蜗反应中传出引起的变化的影响，但这些假设通常尚未得到验证。本研究测量了刺激相位弯曲和时间包络调制对内侧橄榄耳蜗反射（MOCR）和中耳肌反射（MEMR）的影响。MOCR的作用进行了测试，通过测量耳道压力的变化在6 kHz的存在和不存在的频带限制的谐波复杂的音调与各种相位曲率，集中在（频率）或远低于（频率）6 kHz的探头频率。可能的MEMR效应的影响进行了检查，通过测量相位梯度函数的激发子的影响，并通过测量耳道压力的变化与连续抑制器的6 kHz探头。在和关闭频率复杂的音调激发器产生显着的变化，耳道声压。然而，模式的结果是不一致的早期假设假定传出效应产生的心理声学依赖掩蔽掩蔽相曲率的正掩蔽阈值。结果还揭示了与一些传出效应相关的意外长时间常数，其来源仍然未知。
Several studies have postulated that psychoacoustic measures of auditory perception are influenced by efferent-induced changes in cochlear responses, but these postulations have generally remained untested. This study measured the effect of stimulus phase curvature and temporal envelope modulation on the medial olivocochlear reflex (MOCR) and on the middle-ear muscle reflex (MEMR). The role of the MOCR was tested by measuring changes in the ear-canal pressure at 6 kHz in the presence and absence of a band-limited harmonic complex tone with various phase curvatures, centered either at (on-frequency) or well below (off-frequency) the 6-kHz probe frequency. The influence of possible MEMR effects was examined by measuring phase-gradient functions for the elicitor effects and by measuring changes in the ear-canal pressure with a continuous suppressor of the 6-kHz probe. Both on- and off-frequency complex tone elicitors produced significant changes in ear canal sound pressure. However, the pattern of results was not consistent with the earlier hypotheses postulating that efferent effects produce the psychoacoustic dependence of forward-masked thresholds on masker phase curvature. The results also reveal unexpectedly long time constants associated with some efferent effects, the source of which remains unknown.