Roberts B
School of Psychology, University of Birmingham, Edgbaston, England.
J Acoust Soc Am. 1998 Jun;103(6):3588-96. doi: 10.1121/1.423086.
A single even harmonic added to an odd-harmonic complex is often judged to be more salient than its odd neighbors in a clarity rating task [Roberts and Bregman, J. Acoust. Soc. Am. 90, 3050-3060 (1991)]. This study used similar complexes in a two-interval forced-choice procedure. Each interval consisted of a complex tone followed by a pure tone, whose frequency matched that of a harmonic in one interval but was changed by +/- 0.5 x fundamental frequency in the other. Subjects were asked to identify the matching interval. Since the pure tone followed the complex tone, it could not cue listening to a particular frequency region. The possibility of cross-interval cuing was reduced by changing the fundamental frequency between intervals (100-150 Hz range). The procedure was designed to maximize the effects on performance of differences in immediate perceptual salience between the partials. The added even harmonic was typically judged with greater accuracy than its odd neighbors (experiment 1), though this effect was greatly reduced for harmonics above 8 (experiment 2). The even-odd difference persisted when the original stimuli were made inharmonic by applying a frequency shift of 15%, but was abolished for stimuli consisting of successive partials (experiment 3).
在清晰度评级任务中，在一个奇次谐波复合体上叠加一个偶次谐波，通常会被判定为比其奇次相邻谐波更显著[罗伯茨和布雷格曼，《美国声学学会杂志》90, 3050 - 3060(1991)]。本研究在二间隔强迫选择程序中使用了类似的复合体。每个间隔由一个复合音后跟一个纯音组成，纯音的频率在一个间隔中与一个谐波的频率匹配，但在另一个间隔中改变±0.5倍基频。要求受试者识别匹配的间隔。由于纯音跟随复合音，它无法提示对特定频率区域的聆听。通过在间隔之间改变基频（100 - 150赫兹范围），减少了跨间隔提示的可能性。该程序旨在最大化对分音之间即时感知显著性差异的表现的影响。叠加的偶次谐波通常比其奇次相邻谐波的判断准确性更高（实验1），尽管对于高于8次的谐波，这种效应大大降低（实验2）。当通过应用15%的频移使原始刺激变为不和谐时，偶奇差异仍然存在，但对于由连续分音组成的刺激则消失（实验3）。
