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Related Experiment Videos

Ketamine effects on eye movements.

M A Weiler1, G K Thaker, A C Lahti

  • 1Maryland Psychiatric Research Center, University of Maryland at Baltimore,21228, USA.

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
|November 7, 2000
PubMed
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Ketamine, a N-methyl-D-aspartate antagonist, partially replicated schizophrenia-related eye movement abnormalities in healthy subjects. It affected smooth pursuit gain and acceleration but not all measures.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Ophthalmology

Background:

  • Schizophrenia is associated with oculomotor dysfunction.
  • N-methyl-D-aspartate (NMDA) receptor hypofunction is implicated in schizophrenia.
  • Ketamine, an NMDA antagonist, can induce psychosis-like symptoms.

Purpose of the Study:

  • To investigate if ketamine administration can reproduce specific eye movement dysfunctions observed in schizophrenia.
  • To examine the effects of ketamine on smooth pursuit and its initiation in healthy individuals.

Main Methods:

  • A double-blind, placebo-controlled study involving 12 healthy subjects.
  • Administration of a low dose (0.1 mg/kg) ketamine bolus injection.
  • Oculomotor measures including smooth pursuit gain (closed-loop) and measures during masking conditions, as well as measures of smooth pursuit initiation (latency, open-loop acceleration, velocity).

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Main Results:

  • Ketamine significantly disrupted closed-loop gain during smooth pursuit and open-loop acceleration during pursuit initiation.
  • Oculomotor measures during masking conditions were not affected by ketamine.
  • The observed effects partially mimicked abnormalities seen in schizophrenia.

Conclusions:

  • Ketamine administration can partially reproduce specific oculomotor abnormalities associated with schizophrenia, particularly in smooth pursuit and its initiation.
  • These findings support the role of NMDA receptor dysfunction in certain aspects of schizophrenia-related eye movement deficits.
  • Ketamine did not replicate all observed abnormalities, suggesting complex pathophysiology in schizophrenia.