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Midazolam Brain Connectivity Findings Changed With fMRI Processing Choices
A crossover imaging study found that preprocessing decisions affected estimated midazolam-related functional connectivity changes.
A crossover imaging study found that preprocessing decisions affected estimated midazolam-related functional connectivity changes.
Two signals and several pipelines
The researchers combined EEG and fMRI during placebo, ketamine, and midazolam conditions and compared seven preprocessing approaches. More extensive independent-component denoising produced weaker estimated midazolam connectivity increases than some other pipelines. Changes in electrophysiological and hemodynamic correlation structures were not significantly related.
A biomarker depends on measurement decisions
The authors emphasize the absence of a gold standard and the exploratory nature of the analysis. BOLD connectivity indirectly reflects neural processes and can include physiological contributions. An imaging difference therefore should not be described as a direct reading of consciousness or an individual impairment threshold. The paper supports reporting processing choices and uncertainty alongside a pharmacological imaging result. It does not establish that one observed network pattern uniquely identifies midazolam exposure or predicts a patient’s clinical response.
Source paper
Original analysis of the supplied journal article, identified as PMC7267972.