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Auditory attention affects two different areas in the human supratemporal cortex.

J Rif1, R Hari, M S Hämäläinen

  • 1Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.

Electroencephalography and Clinical Neurophysiology
|December 1, 1991
PubMed
Summary

Selective attention modifies human auditory cortex activity, influencing early and late brain responses. This study reveals two distinct attention effects in the supratemporal auditory cortex, impacting auditory processing.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • Selective attention plays a crucial role in processing auditory information.
  • Understanding the neural mechanisms of attention in the auditory cortex is essential for comprehending perception.

Purpose of the Study:

  • To investigate the effects of selective attention on the right human auditory cortex.
  • To differentiate between early and late attention-related neural activity within the auditory cortex.

Main Methods:

  • Utilized a 24-channel planar SQUID-gradiometer to measure magnetoencephalography (MEG) responses.
  • Employed two experimental conditions with varying interstimulus intervals (ISIs) and auditory stimuli (1 and 3 kHz tones).
  • Calculated magnetic difference (Md) to isolate attention-related activity by subtracting responses to irrelevant stimuli from relevant ones.

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Main Results:

  • Identified two distinct attention effects in the supratemporal auditory cortex.
  • An early attention effect (starting at 30-40 msec) overlapped with the N100m response when stimuli were presented to different ears.
  • A later attention effect (peaking around 195-220 msec) was observed anterior to the N100m source, coinciding with the P200m response, when stimuli were presented to the same ear.

Conclusions:

  • Selective attention can modulate neural activity in at least two distinct areas of the human supratemporal auditory cortex.
  • These attention effects likely represent alterations of exogenous evoked response components, affecting both early (N100m) and later (P200m) auditory processing stages.