Fig. 1.

Overview of the 3d printed reaching box from (A) the front, (B) orthogonal view, (C) the top, (D) the side, showing the main features of the behavioral apparatus: 1) rotating disk feeder for automatic food delivery not obstructing the view of the mouse behavior in the box, 2) vertical slit for the animal to reach through, 3) the mirror system allowing to record reach-to-grasp movement from multiple views and reconstruct the trajectory, 4) metal grid floor with frontal bars connected to the controller and used as touch sensors, 5) autonomous experiment controller allowing the full control of the experiment and recording of the animal behavior in the box along with providing the synchro-signal for ephys recording or other experimental devices, 6)single high-speed camera for capturing behavior.