Abstract
Previous research has shown that a virtual pitch percept of the fundamental frequency (F0) can be extracted from a sequence of non-overlapping, harmonically related tones in the presence of background noise. We have established that the F0 percept is strongest for low numbered harmonics and absent when only high-numbered harmonics (>10) are presented as well as when the tones are inharmonically related. The present series of experiments explores the effect of dichotic presentation, notched noise, and varying degrees of inharmonicity on this virtual pitch percept. F0 difference limens (F0DLs) for synchronous and sequentially presented components in noise were measured in normal-hearing participants. For the dichotic conditions, each ear received a random subset of components to investigate if this percept was dependent on peripheral interactions. The inharmonic conditions varied the extent of spectral jitter on each of the components (by 10%, 20%, and 30%) to understand if F0DLs worsened with increasing amounts of jitter. Finally, the notched noise conditions investigated whether background noise within the harmonic frequencies was essential for the F0 percept. Preliminary results indicate that the virtual pitch can be perceived dichotically and the characteristics of the background noise and harmonic relations play key roles in this illusory percept.
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