Maladaptive anticipatory saccades in schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Science

Background:

• Schizophrenia is associated with cognitive deficits, including impairments in eye movement control.
• Understanding saccadic abnormalities may offer insights into the neurobiological underpinnings of schizophrenia.

Purpose of the Study:

• To compare saccadic eye movements in neuroleptic-treated and drug-free schizophrenic patients versus healthy controls.
• To investigate the influence of internal representations on saccade generation in schizophrenia.

Main Methods:

• Two eye movement tasks were administered to assess visually guided and internally guided saccades.
• Saccade accuracy, rate of intrusive saccades, and adaptive anticipatory saccades were measured.

Main Results:

• Schizophrenic patients, regardless of treatment, showed higher rates of intrusive saccades during visually guided tasks.
• Both groups of schizophrenic patients learned to anticipate target jumps in the second task, but neuroleptic-treated patients produced smaller adaptive anticipatory saccades.

Conclusions:

• Abnormal anticipatory saccades in schizophrenia may reflect a failure in sensorimotor gating of internally generated information.
• Neuroleptic treatment might impact the adaptive regulation of anticipatory eye movements, potentially linked to prefrontal cortex-basal ganglia circuitry.