REDUCING INFORMATIONAL MASKING BY SOUND SEGREGATION
REDUCING INFORMATIONAL MASKING BY SOUND SEGREGATION
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DOI：
10.1121/1.410023
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发表时间：
1994-06-01
影响因子：
2.4
通讯作者：
COLBURN, HS
中科院分区：
文献类型：
--
作者：
KIDD, G;MASON, CR;COLBURN, HS
信息掩蔽减少使用三个刺激呈现方案，旨在从知觉上分离的信号掩蔽。掩蔽是在每个刺激间隔上随机选择频率和强度的正弦曲线组，或者在某些情况下，在间隔内的一系列爆发中的每个掩蔽爆发上随机选择频率和强度。掩蔽成分被排除在1000 Hz信号周围的频率区域之外，以最大限度地减少能量掩蔽。在某些条件下，观察到一些受试者的掩蔽阈值比安静阈值高60-70 dB。结果表明，这种信息掩蔽可以减少多达40分贝的：（1）提出的掩蔽物的两个耳朵和信号的一个耳朵;（2）播放不同的掩蔽样本顺序在每一个试验的每个间隔;或（3）提出的信号在交替突发的多个，相同的掩蔽样本。对于双耳操作，信息掩蔽减少，因为掩蔽和信号被认为是来自不同的耳间位置。在后两种操作中，信号和掩蔽物的频谱或时间模式的差异提供了检测线索。这些影响被解释为证据的感知隔离的声音在嘈杂的听觉环境中，信号接收不受能量掩蔽的重要性。
Informational masking was reduced using three stimulus presentation schemes that were intended to perceptually segregate the signal from the masker. The maskers were sets of sinusoids chosen randomly in frequency and intensity on each stimulus interval or, in some conditions, on every masker burst in a series of bursts within intervals. Masker components were excluded from the frequency region surrounding the 1000-Hz signal to minimize the energetic masking. Masked thresholds as great as 60-70 dB above quiet threshold were observed for some subjects in some conditions. It was shown that this informational masking could be reduced as much as 40 dB by: (1) presenting the masker to both ears and signal to one ear; (2) playing different masker samples sequentially in each interval of every trial; or (3) presenting the signal in alternate bursts of multiple, identical masker samples. For the binaural manipulation, informational masking was reduced because the masker and signal were perceived as originating from different interaural locations. In the latter two manipulations, a difference in the spectral or temporal pattern of the signal and masker provided the detection cue. These effects were interpreted as evidence of the importance of perceptual segregation of sounds in noisy listening environments where signal reception is not limited by energetic masking.