Ventral striatum activity in response to reward: differences between bipolar I and II disorders

Caseras, Xavier ORCID: https://orcid.org/0000-0002-8490-6891, Lawrence, Natalia Sophie, Murphy, Kevin ORCID: https://orcid.org/0000-0002-6516-313X, Wise, Richard Geoffrey ORCID: https://orcid.org/0000-0003-1700-2144 and Phillips, Mary Louise 2013. Ventral striatum activity in response to reward: differences between bipolar I and II disorders. American Journal of Psychiatry 170 (5) , pp. 533-541. 10.1176/appi.ajp.2012.12020169

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Abstract

Objective. Little is known about the neurobiology of bipolar II disorder. While bipolar I disorder is associated with abnormally elevated activity in response to reward in the ventral striatum, a key component of reward circuitry, no studies have compared reward circuitry function in bipolar I and bipolar II disorders. Furthermore, associations among reward circuitry activity, reward sensitivity, and striatal volume remain underexplored in bipolar and healthy individuals. The authors examined reward activity in the ventral striatum in participants with bipolar I and II disorders and healthy individuals, the relationships between ventral striatal activity and reward sensitivity across all participants, and between-group differences in striatal gray matter volume and relationships with ventral striatal activity across all participants. Method Twenty healthy comparison subjects and 32 euthymic bipolar I (N=17) and bipolar II (N=15) patients underwent a neuroimaging reward paradigm during functional MRI scanning, structural scanning, and completed psychometric and clinical assessments. Results. Region-of-interest analyses revealed significant ventral striatal activity in all participants during reward anticipation that was significantly greater in bipolar II patients compared with the other groups. Ventral striatal activity during reward anticipation correlated positively with reward sensitivity and fun seeking across all participants. Bipolar II patients had significantly greater left putamen volume than bipolar I patients, and left putamen volume correlated positively with left ventral striatal activity to reward anticipation in all participants. Conclusions. Abnormally elevated ventral striatal activity during reward anticipation may be a potential biomarker of bipolar II disorder. These findings highlight the importance of adopting a dimensional approach in the study of neural mechanisms supporting key pathophysiological processes that may cut across psychiatric disorders.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG) Cardiff University Brain Research Imaging Centre (CUBRIC) Medicine Psychology Neuroscience and Mental Health Research Institute (NMHRI) Physics and Astronomy
Subjects:	R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Publisher:	American Psychiatric Association
ISSN:	0002-953X
Date of First Compliant Deposit:	30 March 2016
Last Modified:	07 May 2023 04:33
URI:	https://orca.cardiff.ac.uk/id/eprint/45885

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