Perceived continuity and pitch perception
Perceived continuity and pitch perception
复制标题
DOI：
10.1121/1.1287022
复制
发表时间：
2000-09-01
影响因子：
2.4
通讯作者：
White, LJ
中科院分区：
文献类型：
--
作者：
Plack, CJ;White, LJ
三个实验研究了感知刺激连续性对于感知未分辨复音基频（F0）的重要性。复合物的F0为250 Hz，谐波在5500和7500 Hz之间进行带通滤波。在第一个实验中，F0的歧视进行了测量，持续时间为20，40和80毫秒的单突发音，并为刺激包含两个20或40毫秒的短纯音由8或16毫秒的间隙分开。对于单脉冲串条件，随着持续时间从20 ms增加到40 ms，阈值大幅下降。然而，在累积持续时间相同的情况下，间隙条件下的性能比单脉冲串条件差得多（例如，由8 ms分隔的两个20-ms突发产生比一个40-ms突发更高的阈值）。在两个猝发音之间的差距中添加带通噪声（与音调具有相同的频谱包络），可将性能提高到单猝发条件的水平。当添加噪音时，两个离散的爆发音被感知为被噪音打断的一个单一的爆发音，这似乎有助于区分。在第二个实验中，研究了由8 ms间隙分开的两个音调突发之间的0.75周期的包络延迟（相移）对音高的影响。如果差距是无声的，则该对的音高不受相移的影响。然而，如果差距包含带通噪声，则脉冲串之间的相移确实在脉冲对的音调中产生显著的向下偏移。最后，第三个实验表明，在一个单一的20毫秒的突发噪声可能会提高一些听众的辨别性能，但不足以解释的第一个实验的结果纯粹在改善的第二个音突发的可辨别性对。实验表明，两个短纯音之间的电平下降可能会破坏或重置长积分机制，从而降低性能。当突发之间不存在电平降低时，听觉系统可以假设两个突发属于相同的单音并且一起分析它们以便导出F0。(C)2000年美国声学学会。【S0001-4966（00）00209-5】。
Three experiments investigated the importance of perceived stimulus continuity For the perception of the fundamental frequency (F0) of an unresolved complex tone. The F0 of the complex was 250 Hz and the harmonics were bandpass filtered between 5500 and 7500 Hz. In the first experiment, F0 discrimination was measured for single-burst tones with durations of 20, 40, and 80 ms, and for stimuli containing two 20- or 40-ms tone bursts separated by an 8- or 16-ms gap. For the single-burst conditions, there was a large decrease in threshold as the duration was increased from 20 to 40 ms. However, performance in the gapped conditions was much worse than that for the single-burst condition with the same cumulative duration (e.g., two 20-ms bursts separated by 8 ms produced higher thresholds than one 40-ms burst). Adding a bandpass noise (with the same spectral envelope as the tone) in the gap between the two tone bursts improved performance to the level of the single-burst condition. When the noise was added, the two discrete tone bursts were perceived as one single tone burst interrupted by the noise, and this seemed to facilitate discrimination. Tn a second experiment, the effects on pitch of an envelope delay (phase shift) of 0.75 periods between two tone bursts separated by an 8-ms gap were investigated. If the gap was silent, the pitch of the pair was unaffected by the phase shift. However, if the gap contained the bandpass noise, the phase shift between the bursts did produce a significant downward shift in the pitch of the pair. Finally, the third experiment showed that presenting a noise before a single 20-ms burst may improve discrimination performance in some listeners, but not sufficiently to account for the results of the first experiment purely in terms of an improvement in the discriminability of the second tone burst in the pair. The experiments suggest that a level decrease between two tone bursts may disrupt or reset a long integration mechanism, decreasing performance. When there is no level decrease between the bursts, the auditory system may assume that the two bursts belong to the same single tone and analyze them together in order to derive F0. (C) 2000 Acoustical Society of America. [S0001-4966(00)00209-5].