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Primary motor (M1) cortical maps in control (CONT) and experimental (EXP) rats performing a moderate repetition, negligible force (MRNF) task. (A) Representative map in a normal control rat. (B) Typical map in an 8 week MRNF rat showing a drastic enlargement of the M1 forelimb cortical map and the task-induced increase in the cortical area devoted to digit, arm-digit (arm = shoulder-digit-wrist) and multi-joint movements (multi-joint responses are highlighted by arrows).
