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Psychophysical and electrophysiologic support for a left hemisphere temporal processing advantage.

M E Nicholls1, M Schier, C K Stough

  • 1Department of Psychology, University of Melbourne, Parkville, VIC, Australia.

Neuropsychiatry, Neuropsychology, and Behavioral Neurology
|March 19, 1999
PubMed
Summary

This study found that the left hemisphere specializes in detecting brief temporal events, explaining the right ear advantage in auditory processing. This suggests a neurological basis for perceptual asymmetries, not just attention.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Cognitive Psychology

Background:

  • Previous studies suggest a right ear advantage in auditory processing.
  • This advantage may stem from a left hemisphere temporal processing advantage or a rightward attentional bias.

Purpose of the Study:

  • Investigate cerebral asymmetries in detecting brief temporal events.
  • Differentiate between a left hemisphere temporal advantage and a rightward attentional bias using psychophysical and electrophysiological measures.

Main Methods:

  • 22 right-handed participants listened to unilateral 300ms white noise bursts.
  • Stimuli contained 4-6ms gaps; participants identified gap presence.
  • Alpha and beta activity in temporal lobes were measured during the task.

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Main Results:

  • Psychophysical data confirmed faster response times and fewer errors for the right ear.
  • No alpha asymmetry was observed between temporal lobes.
  • Higher beta activity was detected in the left temporal lobe.

Conclusions:

  • Electrophysiological data support left hemisphere specialization for temporal event detection.
  • Findings suggest perceptual asymmetry is due to neural specialization, not attentional bias.
  • Discusses links between atypical temporal processing and learning disorders.