Titel
fMRI measurements of amygdala activation are confounded by stimulus correlated signal fluctuation in nearby veins draining distant brain regions
Autor*in
Roland N. Boubela
Center for Medical Physics and Biomedical Engineering, Medical University of Vienna
Autor*in
Klaudius Kalcher
Center for Medical Physics and Biomedical Engineering, Medical University of Vienna
Autor*in
Wolfgang Huf
Center for Medical Physics and Biomedical Engineering, Medical University of Vienna
... show all
Abstract
Imaging the amygdala with functional MRI is confounded by multiple averse factors, notably signal dropouts due to magnetic inhomogeneity and low signal-to-noise ratio, making it difficult to obtain consistent activation patterns in this region. However, even when consistent signal changes are identified, they are likely to be due to nearby vessels, most notably the basal vein of rosenthal (BVR). Using an accelerated fMRI sequence with a high temporal resolution (TR = 333 ms) combined with susceptibility-weighted imaging, we show how signal changes in the amygdala region can be related to a venous origin. This finding is confirmed here in both a conventional fMRI dataset (TR = 2000 ms) as well as in information of meta-analyses, implying that “amygdala activations” reported in typical fMRI studies are likely confounded by signals originating in the BVR rather than in the amygdala itself, thus raising concerns about many conclusions on the functioning of the amygdala that rely on fMRI evidence alone.
Stichwort
AmygdalaFunctional magnetic resonance imaging
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:454083
Erschienen in
Titel
Scientific Reports
Band
5
Seitenanfang
10499
Verlag
Nature Publishing Group
Erscheinungsdatum
2015
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