Electrophysiological Correlates of Intensity Resolution Under Forward Masking
Electrophysiological Correlates of Intensity Resolution Under Forward Masking
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前向掩蔽下强度分辨率的电生理相关性
DOI：
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
D. Oberfeld
中科院分区：
文献类型：
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作者：
D. Oberfeld
非同时掩蔽会严重损害听觉强度分辨率，但这种影响很大程度上取决于刺激配置。例如，强烈的前掩模会导致中等水平标准的强度分辨率明显受损，但对低水平和高水平标准则不会，从而导致中等水平的驼峰模式（Zeng等人，Hear Res 55:223- 230,1991）。这种现象的几个方面不能用听觉外围的机制来解释。例如，后向掩蔽器造成的中等水平的驼峰至少与前向掩蔽器造成的驼峰一样大。本实验旨在研究正向掩蔽物对听觉诱发电位强度分辨和慢速成分N1和P2的影响。记录听者在安静和前向掩蔽下进行单间隔强度辨别任务时的脑电图。90分贝声压级掩蔽器对60分贝声压级的灵敏度比30分贝声压级标准的灵敏度降低更大，反映了中间水平的驼峰。面罩对N1和P2振幅的影响与行为效应平行。在声压级为60 db的情况下，掩蔽器引起的幅度降低比在声压级为30 db的情况下更强，因此也遵循中间水平的驼峰模式。表现出强烈的N1中间峰的听众在敏感度上也表现出强烈的中间峰。
Nonsimultaneous masking can severely impair auditory intensity resolution, but the effect strongly depends on the stimulus configuration. For example, an intense forward masker causes a pronounced impairment in intensity resolution for standards presented at intermediate levels, but not for standards presented at low and high levels, resulting in a midlevel hump pattern (Zeng et al., Hear Res 55:223-230, 1991). Several aspects of the phenomenon cannot be explained by mechanisms in the auditory periphery. For instance, backward maskers cause midlevel humps at least as large as the humps caused by forward maskers. The present experiment was aimed at studying the relation between the effects of forward maskers on intensity resolution and on the slow components N1 and P2 of the auditory evoked potential. The EEG was recorded while listeners performed a one-interval intensity discrimination task in quiet and under forward masking. The 90-dB SPL masker caused a stronger reduction in sensitivity for a 60-dB SPL than for a 30-dB SPL standard, reflecting the midlevel hump. The effect of the masker on the N1 and the P2 amplitude paralleled the behavioral effects. The amplitude reduction caused by the masker was stronger for the 60-dB SPL than for the 30-dB SPL standard, thus also following a midlevel hump pattern. Listeners who showed a strong N1 midlevel hump tended to also exhibit a strong midlevel hump in sensitivity.
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猫初级听觉皮层的时间处理。
DOI：
10.3109/00016489709126145
发表时间：
1997
期刊：
Acta oto-laryngologica. Supplementum
影响因子：
--
作者：
Schreiner,CE;Mendelson,J;Raggio,MW;Brosch,M;Krueger,K
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Krueger,K
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作者：
Kidd, G;Mason, CR;Arbogast, TL
通讯作者：
Arbogast, TL
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2.4
作者：
ZENG, FG;TURNER, CW
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TURNER, CW
影响因子：
3.7
作者：
NOVAK, G;RITTER, W;VAUGHAN, HG
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VAUGHAN, HG
后向掩蔽下的强度歧视。
DOI：
10.1121/1.404205
发表时间：
1992
期刊：
The Journal of the Acoustical Society of America
影响因子：
--
作者：
Plack,CJ;Viemeister,NF
通讯作者：
Viemeister,NF