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Related Experiment Videos

The left parietal cortex and motor attention

M F Rushworth1, P D Nixon, S Renowden

  • 1Department of Experimental Psychology, University of Oxford, U.K. matthew.rushworth@psy.ox.ac.uk

Neuropsychologia
|November 19, 1997
PubMed
Summary
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The left parietal cortex is crucial for motor attention, enabling the disengagement of attention for hand movements. Damage impairs this ability, affecting movement sequencing, similar to orienting attention deficits.

Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • The posterior parietal cortex, especially the right hemisphere, is vital for covert orienting attention, with lesions impairing disengagement from targets.
  • Orienting attention involves shifting focus for eye movements, distinct from preparing limb movements.

Purpose of the Study:

  • To investigate the role of the parietal cortex in motor attention, distinct from orienting attention.
  • To determine if specific brain regions are associated with motor attention and its disengagement.

Main Methods:

  • Developed a novel task to assess covert preparation of cued hand movements using precues.
  • Compared nine subjects with left parietal lesions and nine with right parietal lesions against control subjects.

Main Results:

Related Experiment Videos

  • Left hemisphere subjects could engage motor attention with valid precues but were impaired in disengaging attention with incorrect precues.
  • Right hemisphere lesions did not show the same disengagement impairment for motor attention.
  • Left parietal cortex, particularly the supramarginal gyrus, is implicated in motor attention disengagement.

Conclusions:

  • Two distinct attentional systems exist: one for orienting and one for motor control.
  • Damage to the left parietal cortex causes difficulties in disengaging motor attention, leading to problems in movement sequencing and ideomotor apraxia.