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In controls, choice RT tasks (Right) produced more overall, and more bilateral fMRI activation than simple RT tasks (Left). Activation from left- and right-hand groups have been combined by rotating the data for left-hand movement about the midline. The left hemisphere is on the right-hand side of the images. Images are thresholded at Z > 3.1; cluster extent threshold of P < 0.01. Arrows indicate position of the central sulcus.
