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Differences in the initial postural adjustment (PA1, top) and liftoff (LO, bottom) for trials in which subject groups (Young-SB1, Older-SB1, and Older-SB2) made a correct initial postural adjustment (Preferred), and trials in which subjects made a postural adjustment error (Non-Preferred), during the Perceptual Inhibition-Direction incongruous condition. Error bars represent standard error of the mean.
