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Do temporal processes underlie left hemisphere dominance in speech perception?

Sophie K Scott1, Carolyn McGettigan

  • 1Institute for Cognitive Neuroscience, 17 Queen Square, London WC1N 3AR, UK.

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|October 16, 2013
PubMed
Summary
This summary is machine-generated.

This review challenges the idea that the left hemisphere processes rapid sounds for speech perception. Instead, the right temporal lobe shows preference for sound properties like pitch and duration, with other factors explaining left-lateralized speech processing.

Keywords:
Auditory processingFunctional neuroimagingHemispheric asymmetriesSpeech perception

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Speech Processing

Background:

  • The traditional view posits left hemisphere specialization for rapid auditory processing, crucial for speech perception.
  • This left-hemisphere dominance is often attributed to its sensitivity to temporal acoustic features of speech.

Purpose of the Study:

  • To critically review the historical claims regarding left hemisphere specialization for temporal sound processing in speech perception.
  • To reassess the evidence supporting the assumption of left temporal lobe sensitivity to acoustic speech properties.

Main Methods:

  • Literature review and historical analysis of studies on hemispheric specialization for auditory processing.
  • Examination of evidence for temporal processing in the left versus right temporal lobes.

Main Results:

  • Evidence suggests the right temporal lobe, not the left, exhibits a preference for certain sound characteristics like longer durations and pitch variations.
  • The assumed left temporal lobe sensitivity to rapid acoustic cues in speech is not consistently supported.

Conclusions:

  • The left lateralization of speech perception is likely influenced by factors beyond a specialized sensitivity to temporal acoustic properties.
  • Alternative explanations for speech processing lateralization require further investigation.