The brain metric ISD reliably detects changes in consciousness regardless of how the fMRI data is processed or how long the analysis window is, making it a robust tool for measuring consciousness across different research settings.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether ISD maintains its discriminative power across diverse fMRI acquisition protocols, scanners, and preprocessing pipelines in multi-center studies.
A systematic review and meta-analysis of ISD performance across 50+ independent fMRI studies using different scanners, field strengths, preprocessing pipelines (e.g., with/without GSR, different motion correction), and window sizes, pooling AUC values for consciousness discrimination.
Whether using ISD with different preprocessing methods leads to different clinical decisions during anesthesia.
A double-blind RCT in 150 surgical patients where anesthesiologists are randomized to receive real-time ISD feedback derived from either GSR or noGSR data, with primary outcome being time to extubation and incidence of intraoperative awareness.
Whether ISD calculated with different window sizes yields consistent predictions of recovery time from anesthesia.
A prospective cohort study of 200 patients undergoing anesthesia, calculating ISD with window sizes of 0.5, 2, 4, and 8 minutes, and correlating each with time to return of responsiveness and cognitive recovery.
Whether ISD values differ when calculated using different fMRI preprocessing pipelines in the same individuals.
A cross-sectional study of 50 healthy adults scanned twice on the same day with identical protocols but processed using two different pipelines (e.g., FSL vs. AFNI, with vs. without GSR), measuring ISD consistency across pipelines.
Whether ISD remains stable across different preprocessing methods in a single individual with unusual brain dynamics.
A case report of a single individual with severe motion artifacts undergoing 10 repeated fMRI scans under varying preprocessing conditions (GSR, noGSR, different motion correction, window sizes), measuring ISD stability across conditions.