Figure 6.

Elements and efficiency of the pulley system. A, Elements of the pulley system: a counterweight was used to balance the weight of the headstage preamplifier (visible at the head of the mouse), the rotatory joint transmitting the laser light (blue arrowhead), the optic cables (purple arrowhead), and the recording cable (green arrowhead). The two pulleys could turn around a common axis in the horizontal plane (red arrow). B, Tracking data from a learning trial, showing the position of the animal until the moment of reentering the start-box that is located at the bottom of the figure (the area of the start-box is not included). C, Tracking data from a postprobe (duration: 10 min) showing that the movement of the animal nearly completely covers the cheeseboard.