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Related Experiment Video

Updated: Mar 7, 2026

Examining Online Syntactic Processing of Spoken Complex Sentences in Chinese Using Dual-Modal Interference Tasks
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Speaking rate normalization with and without spatial segregation of simultaneous context sentences.

Dawson Stephens1, Christian E Stilp1,2

  • 1Department of Psychological and Brain Sciences, University of Louisville, Louisville, Kentucky 40292, USA.

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|March 6, 2026
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Summary

Temporal contrast effects (TCEs), or speaking rate normalization, were found to be unaffected by the spatial separation of simultaneous sentences. This suggests that how we perceive speech duration is not influenced by whether talkers are presented diotically or dichotically.

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Area of Science:

  • Phonetics
  • Auditory Perception
  • Psychoacoustics

Background:

  • Fast-rate speech can lead listeners to perceive subsequent speech as longer, and slow-rate speech as shorter. This phenomenon is known as temporal contrast effects (TCEs) or speaking rate normalization.
  • Previous research suggested TCEs were immune to selective attention but facilitated by dichotic presentation of different talkers.

Purpose of the Study:

  • To investigate whether the spatial separation of simultaneous sentences influences the magnitude of temporal contrast effects (TCEs).
  • To determine if TCEs are affected by diotic versus dichotic presentation of speech stimuli.

Main Methods:

  • Participants listened to sentences under three auditory conditions: single talker (diotic), two simultaneous talkers (diotic), and two simultaneous talkers (dichotic).
  • The study measured the magnitude of TCEs across these different presentation conditions.
  • Target words were presented after sentences to assess perceptual judgments.

Main Results:

  • The magnitude of temporal contrast effects (TCEs) remained consistent across all tested conditions, regardless of whether the speech was presented diotically or dichotically.
  • Spatial separation of simultaneous sentences did not significantly alter the perception of speech duration.

Conclusions:

  • The findings suggest that spatial separation does not play a significant role in shaping temporal contrast effects (TCEs).
  • Speaking rate normalization appears robust to variations in auditory spatial cues when processing simultaneous speech.