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<p>Auditory stream segregation was measured using ABA-ABA sequences where A and B were the vowel |α| and A and B differed in fundamental frequency by ΔF0. The aim was to assess the impact of ΔF0 and inter-stimulus interval (ISI) on stream segregation for normal-hearing (NH) and hearing-impaired (HI) participants with mild-to-moderate hearing loss. For each ISI, ΔF0 was varied using an adaptive procedure to estimate the temporal coherence boundary (TCB, the ΔF0 for which two streams were mostly reported) and the fission boundary (FB, the ΔF0 for which one stream was mostly reported). The TCB and FB were smallest for an ISI near 50&#xa0;ms. The increase for smaller ISIs may reflect a tendency for the sequences to be perceived as a single frequency-modulated sound, while the increase for larger ISIs may reflect the effectiveness of F0 differences in promoting stream segregation when a sequence of discrete sounds is perceived. The TCBs were higher for the HI than for the NH participants for all ISIs, while the FBs were higher for the HI participants mainly for ISIs above 50&#xa0;ms. The higher TCB and FB values for the HI participants probably reflect the reduced salience of fundamental frequency differences.</p>

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The effect of sensorineural hearing loss on auditory stream segregation measured as a function of interstimulus interval

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Saransh Jain,
  • Vijaya Kumar Narne,
  • Vasuki Dattakumar,
  • Sunil Kumar Ravi,
  • Brian C. J. Moore

摘要

Auditory stream segregation was measured using ABA-ABA sequences where A and B were the vowel |α| and A and B differed in fundamental frequency by ΔF0. The aim was to assess the impact of ΔF0 and inter-stimulus interval (ISI) on stream segregation for normal-hearing (NH) and hearing-impaired (HI) participants with mild-to-moderate hearing loss. For each ISI, ΔF0 was varied using an adaptive procedure to estimate the temporal coherence boundary (TCB, the ΔF0 for which two streams were mostly reported) and the fission boundary (FB, the ΔF0 for which one stream was mostly reported). The TCB and FB were smallest for an ISI near 50 ms. The increase for smaller ISIs may reflect a tendency for the sequences to be perceived as a single frequency-modulated sound, while the increase for larger ISIs may reflect the effectiveness of F0 differences in promoting stream segregation when a sequence of discrete sounds is perceived. The TCBs were higher for the HI than for the NH participants for all ISIs, while the FBs were higher for the HI participants mainly for ISIs above 50 ms. The higher TCB and FB values for the HI participants probably reflect the reduced salience of fundamental frequency differences.