Effects of temporal stimulus properties on the perception of across-frequency asynchrony.
Effects of temporal stimulus properties on the perception of across-frequency asynchrony.
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DOI：
10.1121/1.4773350
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发表时间：
2013-01
期刊：
影响因子：
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通讯作者：
M. Wojtczak;Jordan A. Beim;C. Micheyl;A. Oxenham
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文献类型：
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作者：
M. Wojtczak;Jordan A. Beim;C. Micheyl;A. Oxenham
使用由 250 Hz 音调和更高频率 1、2、4 或 6 kHz 音调组成的 500 ms 音调对来研究时间刺激参数在跨频率同步和异步感知中的作用。主观判断表明对跨频率同步的真实感知，但对于低频音调领先的线对的异步变化比低频音调滞后的线对更敏感。与主观判断一致，当信号间隔包含一对低频音调领先时，在三选择强制选择任务中测得的异步检测阈值低于一对高频音调领先。当标准异步相对较小（≤20 ms）时，异步辨别会观察到类似的不对称性，但对于较大的标准异步则不会。对起始和偏移斜坡持续时间的独立操纵表明起始在跨频率异步感知中起主导作用。一个受生理学启发的模型，涉及广泛调谐的单耳符合检测器，该检测器接收来自频率选择性起始检测器的输入，能够准确地再现同步判断的不对称分布。该模型为未来对具有跨频率延迟的宽带刺激的反应的生理研究提供了可测试的预测。
The role of temporal stimulus parameters in the perception of across-frequency synchrony and asynchrony was investigated using pairs of 500-ms tones consisting of a 250-Hz tone and a tone with a higher frequency of 1, 2, 4, or 6 kHz. Subjective judgments suggested veridical perception of across-frequency synchrony but with greater sensitivity to changes in asynchrony for pairs in which the lower-frequency tone was leading than for pairs in which it was lagging. Consistent with the subjective judgments, thresholds for the detection of asynchrony measured in a three-alternative forced-choice task were lower when the signal interval contained a pair with the low-frequency tone leading than a pair with a high-frequency tone leading. A similar asymmetry was observed for asynchrony discrimination when the standard asynchrony was relatively small (≤20 ms) but not for larger standard asynchronies. Independent manipulation of onset and offset ramp durations indicated a dominant role of onsets in the perception of across-frequency asynchrony. A physiologically inspired model, involving broadly tuned monaural coincidence detectors that receive inputs from frequency-selective onset detectors, was able to accurately reproduce the asymmetric distributions of synchrony judgments. The model provides testable predictions for future physiological investigations of responses to broadband stimuli with across-frequency delays.