Functional Connectivity Changes on Resting-State fMRI after Mild Traumatic Brain Injury: A Systematic Review

FC changes, categorized on an ordinal scale and separated by the time since injury. −2 = only decreased FC changes, −1 = more areas of decreased FC change than areas of increased FC change, 0 = no FC changes (black) or the same number of areas of decreased and increased FC (gray), 1 = more areas of increased FC change, 2 = only areas of increased FC changes (changes all relative to results in healthy controls). Gray bars are separate from black bars, ie, 3 studies found an equal number of areas of increased and decreased FC in the DMN at <1 month. Eight found no changes, so a total of 11 studies were classified as a 0.