10:36pm Friday 22 September 2017

Do High False Positive Rates Linked to Functional MRI Compromise Results in Neuroimaging Studies?

New Rochelle, NY — Challenging recent claims that inflated false positive rates in the analysis of functional magnetic resonance imaging (fMRI) of the brain may negate the findings of countless previous studies, a new review of this controversial topic takes a fresh look at the analytical tools in question. Scientists from the U.S. National Institutes of Health conclude that the effects of a “bug” in the analysis of functional neuroimages (AFNI) software was greatly exaggerated, according to the new study published in in Brain Connectivity, a peer-reviewed journal from Mary Ann Liebert, Inc., publishers. The article is available free on the Brain Connectivity website until June 24, 2017.

In the article entitled “FMRI Clustering in AFNI: False-Positive Rates Redux,” Robert Cox, Gang Chen, Daniel Glen, Richard Reynolds, and Paul Taylor, National Institutes of Mental Health, NIH, Bethesda, MD, repeated some of the earlier simulations performed using the AFNI tools to assess spatial smoothness and clustering of false-positive results on brain neuroimaging. The researchers reported some, though not a particularly high rate of false positives, and described new approaches that show promise in controlling false positive rates.

“Vigorous scientific debate is a key for scientific progression,” states Christopher Pawela, PhD, Co-Editor-in-Chief of Brain Connectivity. “This manuscript from Dr. Bob Cox and colleagues at the NIH is an important part of that ongoing discourse, especially in light of the many recent media reports calling into question the validity of the fMRI methodology.”

Research reported in this publication was supported by the National Institute of Mental Health and National Institute of Neurological Disorders and Stroke under Award Number ZICMH002888. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.


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