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Median initial postural adjustment (PA1) for all steps, as a function of subject group (Young-SB1, Older-SB1, Older-SB2, and Older-SB3) and task condition. Letters above graph indicate task conditions that are statistically different from the others. SRT: Simple Reaction Time, CRT: Choice Reaction Time, PIL: Perceptual Inhibition-Location, PID: Perceptual Inhibition-Direction, CON: Congruous trials, INC: Incongruous trials. Error bars represent standard error of the mean.
