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(A) The laser is turned on (50 Hz) as long as the mice (n = 4) hold down the lever. (B) Press duration decreases with training, demonstrating that mice are unable to learn to hold the lever down in order to receive extended stimulation. (C) Total number of presses is unaffected by training. For panels B and C, individual data (filled circles) are superimposed over mean+s.e.m. values.
