Figure 2.
A, Observed SICImove modulation from early to late movement preparation (average ± 95% CI) averaged over the whole sample (N = 64). Time zones of movement preparation ranged from early (−5), indicating ∼35% of individual reaction time, to late (0), indicating ∼95% of individual reaction time in approximately equal steps. B, Observed SICImove modulation (average ± 95% CI) depicted for three example age groups: dark blue, young (20–40 years of age); blue, middle-aged (40–60 years of age); light blue, old (60–90 years of age). C, Predicted age-related decrement in SICImove modulation (best linear unbiased predictors for linear slope ± SE) during movement preparation. SICI is presented as conditioned MEP amplitude/unconditioned MEP amplitude × 100 (log transformed). Dashed horizontal line indicates 100% SICI (unconditioned= conditioned MEP amplitude on the log scale).