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Serial and parallel processing in the human auditory cortex: a magnetoencephalographic study.

Koji Inui1, Hidehiko Okamoto, Kensaku Miki

  • 1Department of Integrative Physiology, National Institute for Physiological Sciences, Okazaki 444-8585, Japan. inui@nips.ac.jp

Cerebral Cortex (New York, N.Y. : 1991)
|April 1, 2005
PubMed
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This study reveals the precise timing of auditory signal arrival in human brain areas. Findings suggest both serial processing along the supratemporal plane and parallel streams to other cortical regions.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • Previous research suggested parallel and serial auditory processing in humans and animals.
  • Precise activation timings in human cortical areas remain largely unknown.

Purpose of the Study:

  • To investigate the signal arrival timing in multiple human cortical areas.
  • To elucidate the temporal dynamics of auditory processing.

Main Methods:

  • Magnetoencephalography (MEG) was used to record brain activity in humans.
  • Click stimuli were presented to the left ear to elicit responses.

Main Results:

  • Activations were observed in six right-hemisphere cortical areas: primary auditory cortex (PAC), Heschl's gyrus (HG), posterior parietal cortex (PPC), superior temporal gyrus (STG), and planum temporale (PT).

Related Experiment Videos

  • Mean onset latencies ranged from 17.1 ms (PAC) to 47.6 ms (PT).
  • A serial processing model along the medio-lateral axis of the supratemporal plane was suggested, alongside parallel streams to posterior-superior and anterior regions.

    • Conclusions:

    • The findings support a complex auditory processing model involving both serial and parallel pathways.
    • This study provides crucial temporal data for understanding human auditory perception.