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Related Experiment Videos

Reaching with cerebral tunnel vision

M Rizzo1, W Darling

  • 1Department of Neurology, College of Medicine, University of Iowa Hospitals and Clinics, Iowa City 52242, USA.

Neuropsychologia
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

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Peripheral vision is not essential for controlling reaching movements. Kinesthetic feedback and other cues are sufficient for accurate limb control, even without visual guidance of the hand.

Area of Science:

  • Neuroscience
  • Visuomotor control
  • Human motor behavior

Background:

  • Investigating the role of peripheral vision in goal-directed reaching movements.
  • Examining a patient with bilateral calcarine cortex lesions causing tunnel vision but spared foveal representation.
  • Utilizing 3D brain MRIs to confirm lesion extent within visual areas.

Observation:

  • Patient demonstrated normal hand paths and trajectories during reaching despite inability to see their hand.
  • No significant motor deficits like slowing, tremor, or ataxia were observed.
  • Limb orientation at reach endpoints indicated successful transformation of visual target coordinates.

Findings:

  • Peripheral visual cues are not critical for controlling reaching movements until the hand nears the target.

Related Experiment Videos

  • Kinesthetic feedback is sufficient to guide reaching movements in the absence of visual limb feedback.
  • Blindsight was ruled out as a factor in the patient's reaching performance.

    • Implications:

    • Suggests that visuomotor transformations for reaching occur beyond visual area 18, potentially in area 19.
    • Highlights the adaptability of the motor system in utilizing alternative sensory feedback for limb control.
    • Provides insights into the neural substrates underlying visually guided reaching and sensorimotor integration.