Stimulus parameters governing confusion effects in forward masking.
Stimulus parameters governing confusion effects in forward masking.
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控制前向掩蔽中混乱效应的刺激参数。
DOI：
10.1121/1.392653
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
D. L. Neff
中科院分区：
文献类型：
--
作者：
D. L. Neff
在前向掩蔽中，性能可能会受到混淆的影响，也就是说，很难区分阈上信号与前一掩蔽信号。本研究调查了由100 Hz正弦信号的重复脉冲组成的前向掩蔽物的混淆效应;当信号的属性与单个掩蔽物的脉冲属性相同时，这种“脉冲”掩蔽物会产生混淆。“相对于单个掩蔽脉冲的信号的电平、频率和持续时间，以及偏移起始延迟，都是变化的，以确定消除混淆所需的最小变化。对于由20 ms脉冲组成的掩蔽物，通过改变5 dB的信号电平或改变30至40 Hz的信号频率来消除混淆。对于由10-，20-，或40-ms脉冲组成的掩蔽，混淆被消除的信号延迟8至16毫秒或信号持续时间小于一半或大于两倍的掩蔽脉冲持续时间。结果与自适应程序设计来测量混淆或混淆确定的阈值表明，混淆的影响可以最大限度地减少或避免广泛的听众训练的程序中，信号和掩蔽不呈现在类似的强度。
In forward masking, performance may be affected by confusion, that is, by the difficulty of discriminating a suprathreshold signal from the preceding masker. This study investigated confusion effects for forward maskers composed of repeated bursts of a 100-Hz sinusoid followed by sinusoidal signals; such "pulsing" maskers produce confusion when the properties of the signal are identical to those of an individual masker "pulse." The level, frequency, and duration of the signal relative to an individual masker pulse, as well as offset-onset delay, were varied to determine the minimum change necessary to eliminate confusion. For maskers composed of 20-ms pulses, confusion was eliminated by changes in signal level of 5 dB or changes in signal frequency of 30 to 40 Hz. For maskers composed of 10-, 20-, or 40-ms pulses, confusion was eliminated by signal delays of 8 to 16 ms or by signal durations less than half or greater than twice the masker-pulse duration. Results with adaptive procedures designed to measure confusion-free or confusion-determined thresholds suggest that confusion effects can be minimized or avoided by extensive listener training with a procedure in which the signal and masker are not presented at similar intensities.