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Skill learning: changes in criterion head movement characteristics with extensive repetition. Changes in velocity (A), duration (B), distance (C) , probability of starting at photocell two, the minimum required for a criterion movement (E), and the probability of ending at photocell 5. Values for A, B, and C are average median ± SEM per day for criterion head movements (y-axes). Values for D and E are average probability ± SEM. All x-axes refer to training day.
