Global functional connectivity deficits in schizophrenia depend on behavioral state

Roy Salomon, Maya Bleich-Cohen, Avital Hahamy-Dubossarsky, Ilan Dinstien, Ronit Weizman, Michael Poyurovsky, Marina Kupchik, Moshe Kotler, Talma Hendler, Rafael Malach

Research output: Contribution to journalArticlepeer-review


Schizophrenia is a devastating psychiatric illness characterized by deterioration of cognitive and emotional processing. It has been hypothesized that aberrant cortical connectivity is implicated in the disease (Friston, 1998), yet previous studies of functional connectivity (FC) in schizophrenia have shown mixed results (Garrity et al., 2007; Jafri et al., 2008; Lynall et al., 2010). We measured FC using fMRI in human schizophrenia patients and healthy controls during two different tasks and a rest condition, and constructed a voxelbased global FC index. We found a striking FC decrease in patients compared with controls. In the task conditions, relatively weaker FC was specific to regions of cortex not active during the task. In the rest condition, theFCdifference between patients and controls was larger and allowed a case-by-case separation between individuals of the two groups. The results suggest that the relative reduction of FC in schizophrenia is dependent on the state of cortical activity, with voxels not activated by the task showing higher levels of FC deficiency. This novel finding may shed light on previous reports of FC in schizophrenia. Whether this neural characteristic is related to the development of the disorder remains to be established.

Original languageEnglish
Pages (from-to)12972-12981
Number of pages10
JournalJournal of Neuroscience
Issue number36
StatePublished - 7 Sep 2011
Externally publishedYes

ASJC Scopus subject areas

  • General Neuroscience


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