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Related Experiment Videos

Disordered sensorimotor transformations for reaching following posterior cortical lesions.

W G Darling1, M Rizzo, A J Butler

  • 1Department of Exercise Science, The University of Iowa, Iowa City, IA 52241, USA. warren.darling@uiowa.edu

Neuropsychologia
|February 13, 2001
PubMed
Summary

Sensorimotor transformations (SMT) for reaching visual targets involve brain areas like the inferior parietal lobule (IPL). Lesions in these visual association cortices disrupt SMT, causing significant reaching errors in distance and direction.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visuomotor Control

Background:

  • Accurate visually guided reaching relies on sensorimotor transformations (SMT) to convert target coordinates into limb movements.
  • Understanding the neural basis of SMT is crucial for explaining visuomotor deficits after brain injury.

Purpose of the Study:

  • To investigate the neural substrates supporting sensorimotor transformations (SMT) for reaching.
  • To determine the impact of visual association cortex lesions on the accuracy of reaches to remembered visual targets.

Main Methods:

  • Studied 19 individuals with focal lesions in visual association cortices and white matter.
  • Included 11 control subjects without brain lesions for comparison.
  • Assessed SMT by measuring the accuracy of reaching to remembered visual target locations.

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Main Results:

  • All individuals with inferior parietal lobule (IPL) lesions exhibited significant SMT errors.
  • Subjects with temporo-occipital or occipital area 19 lesions also showed abnormal SMT.
  • Error patterns (direction vs. distance, constant vs. variable) varied even among subjects with similar lesions.

Conclusions:

  • Inferior parietal lobule (IPL) and other visual association areas are critical for sensorimotor transformations (SMT).
  • Distinct neural systems within the visual association cortex may underlie the guidance of reach direction and distance.