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Cortical centres underlying auditory temporal processing in humans: a PET study.

C B Pedersen1, F Mirz, T Ovesen

  • 1Department of Otorhinolaryngology, Aarhus University Hospital, Denmark.

Audiology : Official Organ of the International Society of Audiology
|April 5, 2000
PubMed
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This study used positron emission tomography (PET) to investigate auditory temporal processing. Findings suggest a neural network involving frontal and right parietal lobes supports sound duration perception.

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Cognitive Neuroscience

Background:

  • Auditory temporal processing, specifically discriminating sound duration, is crucial for speech and music comprehension.
  • The precise neural mechanisms underlying auditory temporal processing remain incompletely understood.

Purpose of the Study:

  • To test the hypothesis of a specific neural system involved in auditory temporal processing.
  • To identify brain regions activated during the discrimination of acoustical stimulus duration.

Main Methods:

  • Positron emission tomography (PET) with O-15-labelled water was used to map cerebral blood flow.
  • Five normally-hearing subjects were presented with auditory stimuli of varying durations and manipulated word phoneme durations.
  • A subtraction paradigm alternating stimuli with silence was employed.

Related Experiment Videos

Main Results:

  • Stimuli requiring recognition, memorization, or attention to temporal features activated bilateral frontal lobes.
  • Significant activation was also observed in the right parietal lobe.
  • These activations were associated with auditory temporal processing tasks.

Conclusions:

  • A neural network comprising anterior and posterior auditory attention and short-term memory sites subserves acoustical stimulus duration perception.
  • This network is critical for analyzing and processing the temporal aspects of auditory information.