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Related Experiment Videos

Task-dependent visual coding of sound position in visuospatial neglect patients.

Francesco Pavani1, Alessandro Farnè, Elisabetta Làdavas

  • 1Láboritorio si Scienze Cognitive, University of Trento, Rovereto, Italy. f.pavani@ucl.ac.uk

Neuroreport
|January 25, 2003
PubMed
Summary

Humans, like animals, use multiple reference frames to process sound location. Right brain-damaged patients showed impaired sound localization, especially with visual input influencing pointing but not head-turning responses.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Visuospatial Cognition

Background:

  • Sound localization in animals is known to involve multiple frames of reference (head-centered, eye-centered, etc.).
  • Visuospatial neglect, a condition affecting contralesional space perception, can impact sensory processing.

Purpose of the Study:

  • To investigate whether humans also utilize multiple frames of reference for sound localization.
  • To examine the influence of visual input on sound localization in patients with right brain damage and visuospatial neglect.

Main Methods:

  • 14 right brain-damaged (RBD) patients performed sound localization tasks using hand-pointing or head-turning responses.
  • Tasks were conducted with eyes open or blindfolded, without visual feedback on sound or response.

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  • Patients' responses were analyzed for accuracy and influence of ambient vision, particularly in those with neglect.

    • Main Results:

    • All RBD patients exhibited sound localization deficits, particularly for sounds in the contralesional space.
    • Task-irrelevant vision impaired hand-pointing more than head-turning responses, but only in neglect patients.
    • Ambient vision did not affect head-turning responses, suggesting task-dependent coding.

    Conclusions:

    • Findings support the hypothesis of multiple frames of reference for sound localization in humans.
    • Visual information influences sound localization, especially in neglect patients, extending their spatial bias to auditory space.
    • The modality of the motor response (pointing vs. head-turning) dictates the reliance on visual coding for sound localization.