Altered striatal functional connectivity in subjects with an at-risk mental state for psychosis.

Published

Journal Article

Recent functional imaging work in individuals experiencing an at-risk mental state (ARMS) for psychosis has implicated dorsal striatal abnormalities in the emergence of psychotic symptoms, contrasting with earlier findings implicating the ventral striatum. Our aims here were to characterize putative dorsal and ventral striatal circuit-level abnormalities in ARMS individuals using resting-state functional magnetic resonance imaging (fMRI) and to investigate their relationship to positive psychotic symptoms. Resting-state fMRI was acquired in 74 ARMS subjects and 35 matched healthy controls. An established method for mapping ventral and dorsal striatal functional connectivity was used to examine corticostriatal functional integrity. Positive psychotic symptoms were assessed using the Comprehensive Assessment of At-Risk Mental State and the Positive and Negative Syndrome Scale. Compared with healthy controls, ARMS subjects showed reductions in functional connectivity between the dorsal caudate and right dorsolateral prefrontal cortex, left rostral medial prefrontal cortex, and thalamus, and between the dorsal putamen and left thalamic and lenticular nuclei. ARMS subjects also showed increased functional connectivity between the ventral putamen and the insula, frontal operculum, and superior temporal gyrus bilaterally. No differences in ventral striatal (ie, nucleus accumbens) functional connectivity were found. Altered functional connectivity in corticostriatal circuits were significantly correlated with positive psychotic symptoms. Together, these results suggest that risk for psychosis is mediated by a complex interplay of alterations in both dorsal and ventral corticostriatal systems.

Full Text

Duke Authors

Cited Authors

  • Dandash, O; Fornito, A; Lee, J; Keefe, RSE; Chee, MWL; Adcock, RA; Pantelis, C; Wood, SJ; Harrison, BJ

Published Date

  • July 2014

Published In

Volume / Issue

  • 40 / 4

Start / End Page

  • 904 - 913

PubMed ID

  • 23861539

Pubmed Central ID

  • 23861539

Electronic International Standard Serial Number (EISSN)

  • 1745-1701

Digital Object Identifier (DOI)

  • 10.1093/schbul/sbt093

Language

  • eng

Conference Location

  • United States