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Non-inertial Frames of Reference

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An Operant Intra-/Extra-dimensional Set-shift Task for Mice
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Motor extinction in distinct reference frames: a double dissociation.

Jennifer Heidler-Gary1, Mikolaj Pawlak, Edward H Herskovits

  • 1Department of Neurology, Johns Hopkins University, School of Medicine, Baltimore, MD, USA.

Behavioural Neurology
|June 21, 2012
PubMed
Summary
This summary is machine-generated.

Right hemisphere stroke can cause distinct types of motor extinction. Left hand movements are affected by damage to temporal white matter, while extinction in left space is linked to parietal white matter lesions.

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Area of Science:

  • Neuroscience
  • Neurology
  • Stroke Research

Background:

  • Motor extinction, a phenomenon where simultaneous bilateral stimuli are perceived as unilateral, can occur after stroke.
  • The specific neural correlates and distinct subtypes of motor extinction following right hemisphere stroke require further elucidation.

Purpose of the Study:

  • To investigate the hypothesis that right hemisphere stroke can lead to extinction of left-sided movements.
  • To determine if lesion location influences the type of motor extinction observed.

Main Methods:

  • Ninety-three non-hemiplegic patients with acute right hemisphere stroke participated.
  • Patients performed rapid finger counting tasks with the right hand, left hand, or both simultaneously.
  • Stimuli were presented with hands at sides or crossed over the midline to assess motor extinction.

Main Results:

  • Two distinct forms of motor extinction were identified.
  • Left canonical body extinction (affecting left hand movements) was associated with right temporal white matter lesions.
  • Left space extinction (affecting either hand in left space) was linked to right parietal white matter lesions.

Conclusions:

  • A double dissociation exists between left canonical body extinction and left space motor extinction.
  • Left canonical body extinction is associated with more dorsal (parietal) ischemia.
  • Left space extinction is associated with more ventral (temporal) ischemia.