City Research Online

Abstract

Previous evidence shows a reliable association between psychosis-prone (especially schizotypal) personality traits and performance on dopamine (DA)-sensitive tasks (e.g., prepulse inhibition and antisaccade). Here, we used blood oxygen level-dependent (BOLD) fMRI and an established procedural learning (PL) task to examine the dopaminergic basis of two aspects of psychosis-proneness (specific schizotypy and general psychoticism). Thirty healthy participants (final N = 26) underwent fMRI during a blocked, periodic sequence-learning task which, in previous studies, has been shown to reveal impaired performance in schizophrenia patients given drugs blocking the DA D2 receptor subtype (DRD2), and to correspond with manipulation of DA activity and elicit fronto-striatal-cerebellar activity in healthy people. Psychosis-proneness was indexed by the Psychoticism (P) scale of the Eysenck Personality Questionnaire-Revised (EPQ-R; 1991) and the Schizotypal Personality Scale (STA; 1984). EPQ-R Extraversion and Neuroticism scores were also examined to establish discriminant validity. We found a positive correlation between the two psychosis-proneness measures (r = 0.43), and a robust and unique positive association between EPQ-R P and BOLD signal in the putamen, caudate, thalamus, insula, and frontal regions. STA schizotypy score correlated positively with activity in the right middle temporal gyrus. As DA is a key transmitter in the basal ganglia, and the thalamus contains the highest levels of DRD2 receptors of all extrastriatal regions, our results support a dopaminergic basis of psychosis-proneness as measured by the EPQ-R Psychoticism.

Publication Type:	Article
Additional Information:	PubMed ID: 23596404 This Document is Protected by copyright and was first published by Frontiers. All rights reserved. It is reproduced with permission.
Publisher Keywords:	Science & Technology, Social Sciences, Life Sciences & Biomedicine, Neurosciences, Psychology, Neurosciences & Neurology, schizotypy, sequence learning, dopamine, striatum, thalamus, PSYCHOMETRICALLY IDENTIFIED SCHIZOTYPY, POSITRON-EMISSION-TOMOGRAPHY, FOCAL CEREBELLAR LESIONS, PREDICTION-ERROR SIGNAL, REACTION-TIME-TASK, PREPULSE INHIBITION, SCHIZOPHRENIA-PATIENTS, PARKINSONS-DISEASE, BASAL GANGLIA, HUNTINGTONS-DISEASE
Subjects:	B Philosophy. Psychology. Religion > BF Psychology
Departments:	School of Health & Psychological Sciences > Psychology
Related URLs:	Author
SWORD Depositor:	Symplectic Administrator

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