SPEM dysfunction and general schizotypy as measured by the SSQ: a controlled study

Area of Science:

• Neuroscience
• Psychiatry
• Ophthalmology

Background:

• Smooth pursuit eye movement (SPEM) dysfunction is a recognized characteristic in schizophrenia.
• Schizotypy, particularly high scores on the SSQ General Schizotypy scale, is associated with the prodromal phase of schizophrenia.

Purpose of the Study:

• To investigate if SPEM dysfunction is present in individuals with high schizotypy scores.
• To explore the relationship between schizotypy and eye movement characteristics.

Main Methods:

• Analysis of variance (ANOVA) was used to compare SPEM in subjects with high versus average SSQ General Schizotypy scores.
• Eye movements were recorded while participants tracked targets moving at different speeds.
• The association between schizotypy scores and baseline pupil size was also assessed.

Main Results:

• Individuals scoring high on the SSQ General Schizotypy scale exhibited greater SPEM dysfunction compared to those with average scores.
• This difference in SPEM dysfunction was consistent across various target speeds.
• No significant correlation was found between baseline pupil size and General Schizotypy scores.

Conclusions:

• SPEM dysfunction is associated with schizotypal traits.
• These findings suggest that SPEM dysfunction can be an early indicator, observable in the general population, preceding the clinical onset of schizophrenia.