Binaural release from masking in forward-masked intensity discrimination: Evidence for effects of selective attention
Binaural release from masking in forward-masked intensity discrimination: Evidence for effects of selective attention
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DOI：
10.1016/j.heares.2012.09.004
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发表时间：
2012-12-01
期刊：
影响因子：
2.8
通讯作者：
Kuta, Martha
中科院分区：
文献类型：
--
作者：
Oberfeld, Daniel;Stahn, Patricia;Kuta, Martha
在前掩蔽强度辨别任务中，我们通过耳间时间差（ITD）的变化操纵掩蔽的感知偏侧化。掩蔽和目标是500 Hz的纯音，持续时间为30 ms。标准的30和60 dB SPL与60或90 dB SPL掩蔽相结合。正如预期的那样，一个前掩蔽被认为是偏侧到头部的另一侧作为目标的呈现导致了一个显着较小的海拔的强度差limen比掩蔽偏侧同侧。这种在前向掩蔽强度辨别中从掩蔽的双耳释放不能用外围机制来解释，因为改变ITD将神经表示留在单声道中（即，在听觉神经中）不变。相反，我们的研究结果是兼容的假设，掩蔽和目标之间的偏侧化差异促进对象隔离，从而促进基于对象的选择性注意的目标。(C)2012 Elsevier B.V.保留所有权利。
In a forward-masked intensity discrimination task, we manipulated the perceived lateralization of the masker via variation of the interaural time difference (ITD). The maskers and targets were 500 Hz pure tones with a duration of 30 ms. Standards of 30 and 60 dB SPL were combined with 60 or 90 dB SPL maskers. As expected, the presentation of a forward masker perceived as lateralized to the other side of the head as the target resulted in a significantly smaller elevation of the intensity difference limen than a masker lateralized ipsilaterally. This binaural release from masking in forward-masked intensity discrimination cannot be explained by peripheral mechanisms because varying the ITD leaves the neural representation in the monaural channels (i.e., in the auditory nerve) unaltered. Instead, our results are compatible with the assumption that lateralization differences between masker and target promote object segregation and therefore facilitate object-based selective attention to the target. (C) 2012 Elsevier B.V. All rights reserved.