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Visual facial grasp.

Alonso R Riestra1, Kenneth M Heilman

  • 1Department of Neurology of the Mexican Institute of Neurosciences, Huixquilucan Estado de México, México. alonso_riestra@intramedios.com.mx

Neurocase
|March 25, 2005
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Summary
This summary is machine-generated.

A new ocular sign, the visual facial grasp, is described for cortical dysfunction. This primitive stimulus-bound behavior was observed in patients with Alzheimer's disease and corticobasal degeneration.

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Area of Science:

  • Neurology
  • Ophthalmology
  • Neuroscience

Background:

  • Degenerative neurological diseases can affect the vestibular-ocular reflex (VOR).
  • The

Observation:

  • Three patients with progressive supranuclear palsy (PSP), Alzheimer's disease (AD), and corticobasal degeneration (CBD) were studied.
  • Patients with AD and CBD showed a visual facial grasp, a preference for fixating on an examiner's face.
  • This involved improved smooth pursuit when the face was the visual target.

Findings:

  • The visual facial grasp suggests a primitive stimulus-bound behavior.
  • This contrasts with a true VOR release seen in PSP.
  • Patients with AD and CBD could inhibit VOR when the target was the examiner's face.

Implications:

  • The visual facial grasp may indicate specific cortical dysfunction in AD and CBD.
  • This new sign could aid in diagnosing and understanding these neurodegenerative diseases.
  • Further research is needed to validate the visual facial grasp as a diagnostic tool.