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Related Experiment Video

Updated: Dec 16, 2025

Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception

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Published on: August 9, 2024

Intelligibility of chimeric locally time-reversed speech.

Ikuo Matsuo¹, Kazuo Ueda², Yoshitaka Nakajima²

¹Department of Information Science, Tohoku Gakuin University, 2-1-1 Tenjinzawa, Izumi-ku, Sendai, 981-3193, Japan.

The Journal of the Acoustical Society of America

|July 3, 2020

Summary

Chimeric speech, with partially time-reversed segments, was more understandable than fully reversed speech. The auditory system can process degraded and intact speech information simultaneously for better intelligibility.

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Area of Science:

Auditory perception
Speech processing
Psychoacoustics

Background:

Understanding speech intelligibility is crucial for auditory research.
Time-reversed speech presents unique challenges to auditory processing.

Purpose of the Study:

To investigate the intelligibility of chimeric locally time-reversed speech.
To determine how varying the degraded band's frequency boundary and segment duration affects intelligibility.

Main Methods:

Chimeric speech stimuli were created with varying boundary frequencies and segment durations.
Japanese mora accuracy was measured to assess intelligibility.
Compared intelligibility of chimeric stimuli against locally time-reversed controls.

Main Results:

Japanese mora accuracy declined with increased degraded band width or segment duration.
Chimeric stimuli demonstrated higher intelligibility compared to time-reversed controls.
Intelligibility was preserved when the amplitude envelope (840-1600 Hz) remained intact.

Conclusions:

The auditory system can integrate information from both temporally degraded and intact speech segments.
Speech intelligibility depends on the preservation of specific frequency band envelopes.
Auditory processing effectively utilizes multi-frequency information for speech comprehension.