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<p>An alternating tone sequence may be perceptually integrated into one stream or segregated into two streams based on pitch and timbre differences between the tones (<i>sequential stream segregation</i>). However, the effect of the spectral dispersion of harmonic complex tones on sequential stream segregation has been largely unexplored. We introduced <i>band tones</i> that were harmonic complex tones divided into several frequency bands, in which frequency components in every other frequency band were removed. Here, we show that segregation was reported more often with fewer frequency bands and larger separation in fundamental frequency. Listeners generally responded to 2–8-band stimuli as segregated most of the time. However, the percentages of segregation responses for 16-band stimuli were generally dominated by fundamental frequency separations and whether the movements of fundamental frequencies and band-like spectral patterns were congruent or incongruent. The results suggest that the auditory system cannot organize rapidly alternating frequency component blocks spanning a wide frequency range into one stream.</p>

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Band Tones: Auditory Stream Segregation with Alternating Frequency Bands

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月4日

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  • Geng-Yan Jhang,
  • Kazuo Ueda,
  • Hiroshige Takeichi,
  • Gerard B. Remijn,
  • Emi Hasuo

摘要

An alternating tone sequence may be perceptually integrated into one stream or segregated into two streams based on pitch and timbre differences between the tones (sequential stream segregation). However, the effect of the spectral dispersion of harmonic complex tones on sequential stream segregation has been largely unexplored. We introduced band tones that were harmonic complex tones divided into several frequency bands, in which frequency components in every other frequency band were removed. Here, we show that segregation was reported more often with fewer frequency bands and larger separation in fundamental frequency. Listeners generally responded to 2–8-band stimuli as segregated most of the time. However, the percentages of segregation responses for 16-band stimuli were generally dominated by fundamental frequency separations and whether the movements of fundamental frequencies and band-like spectral patterns were congruent or incongruent. The results suggest that the auditory system cannot organize rapidly alternating frequency component blocks spanning a wide frequency range into one stream.