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Lefties get it "right" when hearing tool sounds.

James W Lewis1, Raymond E Phinney, Julie A Brefczynski-Lewis

  • 1Department of Physiology and Phamacology, West Virginia University, WV 26506-9229, USA. jlewis@hsc.wvu.edu

Journal of Cognitive Neuroscience
|July 25, 2006
PubMed
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Humans process tool sounds in brain areas opposite their dominant hand. This suggests auditory recognition of tools relies on motor imagery and action schemas, highlighting a unique human cognitive ability.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Auditory Perception

Background:

  • Human tool use is a defining characteristic, involving complex auditory processing.
  • Previous research indicated tool sounds activate left-hemisphere motor regions in right-handers.

Purpose of the Study:

  • To investigate hemispheric specialization for processing tool sounds based on handedness.
  • To compare brain activation patterns for tool sounds versus animal vocalizations in right- and left-handed individuals.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure cortical activation.
  • Participants categorized sounds (tools vs. animal vocalizations).
  • Tool-use gesture pantomime task identified high-level motor and multisensory regions.

Related Experiment Videos

Main Results:

  • Tool sounds preferentially activated brain regions in the hemisphere opposite the dominant hand.
  • This effect was observed in specific high-level motor-related and multisensory cortical areas.
  • Activation patterns differed between right- and left-handed listeners.

Conclusions:

  • Auditory recognition of tool sounds is organized contralaterally to the dominant hand.
  • This contralateral organization likely supports tool sound recognition through motor imagery and action schemas.
  • Brain processing of tool sounds reflects the sensorimotor experience of tool use.