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Neuroimage. 2014 Oct 1;99:269-80. doi: 10.1016/j.neuroimage.2014.05.030. Epub 2014 May 17.

Comparison of structural covariance with functional connectivity approaches exemplified by an investigation of the left anterior insula.

Author information

1
Institute of Neuroscience and Medicine (INM-1), Research Centre Jülich, Jülich, Germany; Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
2
Institute of Neuroscience and Medicine (INM-1), Research Centre Jülich, Jülich, Germany; Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University Hospital, Aachen, Germany.
3
Department of Physics, Florida International University, Miami, FL, USA.
4
Research Imaging Institute, University of Texas Health Science Center at San Antonio, TX, USA; South Texas Veterans Administration Medical Center, San Antonio, TX, USA.
5
Institute of Neuroscience and Medicine (INM-1), Research Centre Jülich, Jülich, Germany; Institute of Clinical Neuroscience and Medical Psychology, Heinrich Heine University, Düsseldorf, Germany. Electronic address: s.eickhoff@fz-juelich.de.

Abstract

The anterior insula is a multifunctional region involved in various cognitive, perceptual and socio-emotional processes. In particular, a portion of the left anterior insula is closely associated with working memory processes in healthy participants and shows gray matter reduction in schizophrenia. To unravel the functional networks related to this left anterior insula region, we here combined resting state connectivity, meta-analytic-connectivity modeling (MACM) and structural covariance (SC) in addition to functional characterization based on BrainMap meta-data. Apart from allowing new insight into the seed region, this approach moreover provided an opportunity to systematically compare these different connectivity approaches. The results showed that the left anterior insula has a broad response profile and is part of multiple functional networks including language, memory and socio-emotional networks. As all these domains are linked with several symptoms of schizophrenia, dysfunction of the left anterior insula might be a crucial component contributing to this disorder. Moreover, although converging connectivity across all three connectivity approaches for the left anterior insula were found, also striking differences were observed. RS and MACM as functional connectivity approaches specifically revealed functional networks linked with internal cognition and active perceptual/language processes, respectively. SC, in turn, showed a clear preference for highlighting regions involved in social cognition. These differential connectivity results thus indicate that the use of multiple forms of connectivity is advantageous when investigating functional networks as conceptual differences between these approaches might lead to systematic variation in the revealed functional networks.

KEYWORDS:

BrainMap; Meta-analytic connectivity modeling (MACM); Resting state; Schizophrenia; fMRI

PMID:
24844743
PMCID:
PMC4251452
DOI:
10.1016/j.neuroimage.2014.05.030
[Indexed for MEDLINE]
Free PMC Article
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