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Segmentation window of speech information processing in the human auditory cortex.

Minoru Hayashi1, Tetsuo Kida2,3, Koji Inui2,3

  • 1Department of Interdisciplinary Science and Engineering, School of Science and Engineering, Meisei University, Tokyo, 191-8506, Japan. minoru.hayashi@meisei-u.ac.jp.

Scientific Reports
|October 25, 2024
PubMed
Summary
This summary is machine-generated.

Researchers studied how the brain processes speech using auditory evoked magnetic fields (AEFs). Findings suggest the brain segments speech into discrete units within a 75-94 ms temporal window, crucial for understanding rapid speech.

Keywords:
Auditory evoked magnetic fieldsContinuous speechSpeech perceptionSuperior temporal areaTemporal segmentation window

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Speech Processing

Background:

  • Humans perceive continuous speech as discrete sequences.
  • Understanding the temporal segmentation of speech in the auditory cortex is key to speech perception.
  • Auditory evoked magnetic fields (AEFs) offer insights into neural processing of auditory stimuli.

Purpose of the Study:

  • To investigate the temporal segmentation window of speech information processing in the human auditory cortex.
  • To clarify the relationship between speech perception and cortical responses.
  • To determine the neural basis for segmenting continuous speech signals.

Main Methods:

  • Auditory evoked magnetic fields (AEFs) were measured in participants.
  • Participants listened to synthetic Japanese words /atataka/ with varying speech rates and durations (75-600 ms).
  • Analysis focused on correlating AEFs, particularly M100 responses, with stimulus duration and perceived syllables.

Main Results:

  • A clear correlation was found between AEFs and perceived syllables.
  • Words with durations between 375-600 ms elicited four M100 responses from the superior temporal area.
  • These responses corresponded to speech onset and consonant/vowel syllable units, with the number of responses correlating with stimulus duration and syllable count.

Conclusions:

  • The temporal segmentation window limit for speech perception is approximately 75-94 ms.
  • This neural segmentation mechanism is fundamental for processing spoken language.
  • Findings can inform the development of advanced, high-speed synthesized speech generation systems.