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(A) Relationship between stop-signal reaction time (SSRT) and NAA/mIns ratio in preSMA (young adults: r = −0.474, n = 25) and occipital cortex (OCC) (older adults: r = −0.465, n = 26); both ≤ 0.017. (B) Relationship between SSRT and tissue-corrected mIns levels in the OCC (older adults: r = 0.584, n = 26, P = 0.002). Longer SSRTs are indicative of less-efficient reactive inhibitory control.
