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A Method to Study Adaptation to Left-Right Reversed Audition
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Opposite brain laterality in analogous auditory and visual tests.

Leif Oltedal1,2, Kenneth Hugdahl1,3

  • 1a Department of Radiology , Haukeland University Hospital , Bergen , Norway.

Laterality
|December 21, 2016
PubMed
Summary

This study investigated language processing laterality using auditory and visual tasks. Results showed opposite laterality for visual and auditory language tasks, suggesting they measure different cognitive processes.

Keywords:
Hemispheric asymmetrydichotic listeningfMRIlateralityvisual half-field

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psycholinguistics

Background:

  • Language processing lateralization is typically assessed using auditory and visual tasks.
  • A right ear/right visual half-field (VHF) advantage usually indicates left-hemispheric language dominance.
  • Auditory tasks historically yield more reliable language laterality results than VHF tasks.

Purpose of the Study:

  • To compare auditory and visual language laterality tasks within the same participants.
  • To investigate potential discrepancies in language processing lateralization between sensory modalities.
  • To replicate and extend findings on cross-modal correlations in language laterality.

Main Methods:

  • Adapted a paradigm combining dichotic listening (auditory) and visual half-field (VHF) tasks.
  • Conducted two experiments, with the second incorporating functional Magnetic Resonance Imaging (fMRI).
  • Collected both behavioral data and brain activation measures.

Main Results:

  • Experiment 1: Demonstrated a right-ear advantage for auditory tasks and a left half-field advantage for visual tasks.
  • Experiment 2: Replicated the opposing laterality effects observed in the first experiment.
  • fMRI data in the second experiment provided neural correlates for the behavioral findings.

Conclusions:

  • Replicated previous findings of opposite laterality for visual and auditory language tasks.
  • Supported the interpretation that these tasks tap into distinct cognitive processes.
  • Highlighted the importance of considering sensory modality when assessing language lateralization.