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Erschienen in: Brain Structure and Function 6/2009

01.10.2009 | Original Article

Measurement of spontaneous signal fluctuations in fMRI: adult age differences in intrinsic functional connectivity

verfasst von: Nan-kuei Chen, Ying-hui Chou, Allen W. Song, David J. Madden

Erschienen in: Brain Structure and Function | Ausgabe 6/2009

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Abstract

Functional connectivity (FC) reflects the coherence of spontaneous, low-frequency fluctuations in functional magnetic resonance imaging (fMRI) data. We report a behavior-based connectivity analysis method, in which whole-brain data are used to identify behaviorally relevant, intrinsic FC networks. Nineteen younger adults (20–28 years) and 19 healthy, older adults (63–78 years) were assessed with fMRI and diffusion tensor imaging (DTI). Results indicated that FC involving a distributed network of brain regions, particularly the inferior frontal gyri, exhibited age-related change in the correlation with perceptual-motor speed (choice reaction time; RT). No relation between FC and RT was evident for younger adults, whereas older adults exhibited a significant age-related slowing of perceptual-motor speed, which was mediated by decreasing FC. Older adults’ FC values were in turn associated positively with white matter integrity (from DTI) within the genu of the corpus callosum. The developed FC analysis illustrates the value of identifying connectivity by combining structural, functional, and behavioral data.
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Metadaten
Titel
Measurement of spontaneous signal fluctuations in fMRI: adult age differences in intrinsic functional connectivity
verfasst von
Nan-kuei Chen
Ying-hui Chou
Allen W. Song
David J. Madden
Publikationsdatum
01.10.2009
Verlag
Springer-Verlag
Erschienen in
Brain Structure and Function / Ausgabe 6/2009
Print ISSN: 1863-2653
Elektronische ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-009-0218-4

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