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Related Experiment Videos

Handedness effects on interhemispheric transfer time: a TMS study.

Demis Basso1, Tomaso Vecchi, Lilach Akiva Kabiri

  • 1Laboratory of Clinical Biochemistry and Molecular Biology, University of Pisa, Italy. demis.basso@unipv.it

Brain Research Bulletin
|July 25, 2006
PubMed
Summary

Transcranial magnetic stimulation (TMS) applied to the motor cortex delays interhemispheric transfer time (ITT) during visuo-motor tasks. Handedness influences ITT, with dominant hemisphere processing playing a key role in information transfer.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Motor Control

Background:

  • The crossed-uncrossed difference (CUD) quantifies interhemispheric transfer time (ITT) via the corpus callosum.
  • Prior studies indicate transcranial magnetic stimulation (TMS) to the occipital cortex impacts CUD during cognitive tasks.

Purpose of the Study:

  • To investigate if TMS applied during a motor stage interferes with ITT.
  • To compare the effects of TMS on ITT between left- and right-handed individuals.

Main Methods:

  • TMS was applied to the primary motor cortex.
  • Participants performed tasks measuring reaction times and CUD.
  • Performance differences between left- and right-handed individuals were analyzed.

Main Results:

Related Experiment Videos

  • TMS stimulation of the left primary motor area significantly increased reaction times.
  • These effects were more pronounced when information was processed by the dominant hemisphere.
  • Both left and right TMS increased CUD in right-handers, but only left TMS in left-handers.
  • TMS effects were larger in the crossed than uncrossed conditions for both groups.

Conclusions:

  • Interhemispheric transfer of visuo-motor information occurs at a motor processing stage.
  • The dominant hemisphere plays a critical role in ITT.
  • Left- and right-handed individuals exhibit distinct ITT latencies related to interhemispheric information transfer.