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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice

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Associations between schizotypy and cerebral laterality.

Haeme R P Park¹, Karen E Waldie¹

¹a School of Psychology and Centre for Brain Research , The University of Auckland , Auckland , New Zealand.

|March 11, 2016

Summary

This study found no evidence of atypical language lateralization in adults with non-clinical schizotypy. Research on schizotypy and brain function suggests typical left hemisphere language processing in this group.

Keywords:

Dual-task Schizotypy fMRI language laterality

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Area of Science:

Neuroscience
Psychology
Cognitive Science

Background:

Schizophrenia is associated with atypical language lateralization, potentially linked to left hemispheric dysfunction.
Research on non-clinical schizotypy and language lateralization has yielded inconsistent findings, with some studies reporting reduced or reversed lateralization and others typical left-hemispheric specialization.

Purpose of the Study:

To investigate language lateralization in adults with high and low schizotypy using behavioral and neuroimaging methods.
To clarify the relationship between non-clinical schizotypy, particularly positive schizotypal traits, and cerebral language processing.

Main Methods:

Employed a dual reading-finger tapping task to assess behavioral language lateralization.
Utilized a functional magnetic resonance imaging (fMRI) lexical decision task to examine neural correlates of language lateralization.
Recruited a university sample of adults categorized as high or low in schizotypy based on the Oxford-Liverpool Inventory of Feelings and Experiences.

Main Results:

No significant evidence of atypical language lateralization was found in the overall schizotypy group.
Analysis of the positive schizotypy subgroup (Unusual Experiences) also revealed no atypical language lateralization.
Findings indicate that non-clinical schizotypy is not associated with altered language processing lateralization.

Conclusions:

Non-clinical schizotypy, across overall and positive trait dimensions, does not appear to be linked to atypical language lateralization.
These results contribute to the understanding of the neurobiological underpinnings of schizotypy, differentiating it from clinical schizophrenia in terms of language lateralization.
Further research may explore other cognitive functions or different schizotypy measures to fully elucidate brain-behavior relationships in non-clinical populations.