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Related Experiment Videos

Human temporal-lobe response to vocal sounds.

Pascal Belin1, Robert J Zatorre, Pierre Ahad

  • 1Neuropsychology/Cognitive Neuroscience Unit, Montreal Neurological Institute, McGill University, 3801 University street, Montreal, Québec H3A 2B4, Canada. pascal@bic.mni.mcgill.ca

Brain Research. Cognitive Brain Research
|February 28, 2002
PubMed
Summary

This study reveals how the brain processes vocal sounds, distinguishing between speech and non-speech. Specific regions in the right anterior superior temporal sulcus (STS) are key for understanding non-speech vocal cues, like emotion.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Cognitive Neuroscience

Background:

  • Voice perception involves recognizing identity and emotion, termed the 'auditory face'.
  • Neural mechanisms for processing paralinguistic vocal information are less understood than speech perception.
  • Previous research identified voice-selective regions in the superior temporal sulcus (STS).

Purpose of the Study:

  • Investigate how neural activity in voice areas is affected by linguistic content (speech vs. non-speech).
  • Examine the impact of frequency scrambling on neural responses to vocal sounds.
  • Identify brain regions specifically involved in processing paralinguistic vocal information.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.

Related Experiment Videos

  • Participants listened to speech and non-speech vocalizations, some of which were frequency-scrambled.
  • Neural responses were analyzed in auditory cortex, including primary auditory cortex (A1) and anterior STS.

    • Main Results:

    • Speech sounds elicited stronger responses than non-speech vocalizations across much of the auditory cortex, including A1.
    • Frequency scrambling caused greater response reduction in anterior STS areas compared to A1.
    • Right anterior STS regions showed selective activation for non-scrambled non-speech vocal sounds over scrambled versions.

    Conclusions:

    • Auditory cortex, including A1, is generally more responsive to speech than non-speech vocalizations.
    • Anterior STS regions are crucial for processing vocal information, with greater sensitivity to frequency scrambling.
    • Right anterior STS demonstrates a specific role in the neural basis of paralinguistic voice perception.