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. 2012 Sep 26;108(12):3416–3423. doi: 10.1152/jn.00669.2012

Fig. 1.

Fig. 1.

The choice ball apparatus. A: orientation of the choice ball. A ping-pong ball replacing a commercial trackball was fitted with a steel rod and secured in the trackball chassis such that it rotated freely about its axis in range of the trackball optical motion sensor. At the beginning of each trial, the mouse's front paws rested on the ball approximately as shown (also see Supplemental Video S1 available in the data supplement online at the Journal of Neurophysiology web site). B: photo diagram of task setup. A head-fixed mouse is positioned with its front paws on the choice ball and its hindpaws on a fixed platform. A water-dispensing lickometer is positioned within reach of its tongue. A light-emitting diode (LED) on the lickometer indicated the no-movement period to the mouse at the start of each trial. Speakers positioned laterally on either side of the mouse were used to present the stimulus (head fixture beams omitted for clarity).

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