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Results of (a) Experiment 1a and (b) Experiment 1b: mean error as a function of letter position and block. Mean error was defined as the number of unrecognized letters averaged across font sizes and observers. Observers completed two blocks: preadaptation (PA) and either adaptation to contracting motion (AC; Experiment 1a) or adaptation to expanding motion (AE; Experiment 1b). Error bars denote ±1 SEM.
