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Related Experiment Videos

Lateralization of speech and auditory temporal processing

P Belin1, M Zilbovicius, S Crozier

  • 1Service Hospitalier Frédéric Joliot, Département de Recherche Médicale, Orsay, France. belin@uriens.shfj.cea.fr

Journal of Cognitive Neuroscience
|August 26, 1998
PubMed
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Temporal processing of rapid acoustic transitions in the brain is lateralized, with the left hemisphere showing greater activation. This auditory asymmetry may contribute to language lateralization from early cortical processing stages.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • Language lateralization is a key feature of human brain function.
  • The role of auditory temporal processing in this lateralization remains unclear.

Purpose of the Study:

  • To investigate the link between temporal processing in auditory stimuli and language lateralization.
  • To determine if auditory processing of rapid acoustic changes is lateralized in the human brain.

Main Methods:

  • Positron emission tomography (PET) was used to monitor cerebral activation in human volunteers.
  • Subjects underwent passive auditory stimulation with nonverbal sounds featuring rapid (40 msec) or extended (200 msec) frequency transitions.

Main Results:

Related Experiment Videos

  • Slow frequency transitions elicited bilateral symmetric activation in the auditory cortex.
  • Rapid frequency transitions resulted in left-biased asymmetry, characterized by reduced right auditory cortex response.
  • This indicates lateralized auditory processing of rapid acoustic information.

Conclusions:

  • Auditory processing of rapid acoustic transitions is lateralized in the human brain.
  • This functional asymmetry in temporal processing likely contributes to language lateralization at early cortical levels.