Bernstein Joshua G W, Oxenham Andrew J
Army Audiology and Speech Center, Walter Reed Army Medical Center, 6900 Georgia Avenue N.W., Washington, DC 20307, USA.
J Acoust Soc Am. 2008 Sep;124(3):1653-67. doi: 10.1121/1.2956484.
This study investigated the relationship between harmonic frequency resolution and fundamental frequency (f(0)) discrimination. Consistent with earlier studies, f(0) discrimination of a diotic bandpass-filtered harmonic complex deteriorated sharply as the f(0) decreased to the point where only harmonics above the tenth were presented. However, when the odd harmonics were mistuned by 3%, performance improved dramatically, such that performance nearly equaled that found with only even harmonics present. Mistuning also improved performance when alternating harmonics were presented to opposite ears (dichotic condition). In a task involving frequency discrimination of individual harmonics within the complexes, mistuning the odd harmonics yielded no significant improvement in the resolution of individual harmonics. Pitch matches to the mistuned complexes suggested that the even harmonics dominated the pitch for f(0)'s at which a benefit of mistuning was observed. The results suggest that f(0) discrimination performance can benefit from perceptual segregation based on inharmonicity, and that poor performance when only high-numbered harmonics are present is not due to limited peripheral harmonic resolvability. Taken together with earlier results, the findings suggest that f(0) discrimination may depend on auditory filter bandwidths, but that spectral resolution of individual harmonics is neither necessary nor sufficient for accurate f(0) discrimination.
本研究调查了谐波频率分辨率与基频（f(0)）辨别之间的关系。与早期研究一致，当f(0)降低到仅呈现高于第十谐波的程度时，双耳带通滤波谐波复合体的f(0)辨别能力急剧下降。然而，当奇次谐波失谐3%时，表现显著改善，以至于表现几乎等同于仅呈现偶次谐波时的情况。当交替谐波呈现给对侧耳朵（双耳条件）时，失谐也改善了表现。在一项涉及复合体中单个谐波频率辨别的任务中，奇次谐波失谐并未使单个谐波的分辨率有显著提高。与失谐复合体的音高匹配表明，对于观察到失谐益处的f(0)，偶次谐波主导了音高。结果表明，f(0)辨别表现可受益于基于不和谐性的感知分离，并且当仅存在高序号谐波时表现不佳并非由于外周谐波分辨率有限。结合早期结果，这些发现表明f(
