Fig. 1

Validation of the Multi-Animal Positioning System (MAPS). MAPS is a video-and PC-based analysis system capable of determining the X–Y positions of multiple mice within a group. a A representative array of light and dark boxes. b Representative video stills recorded by MAPS (upper panel) and the corresponding tracking data (lower panel). MAPS succeeded in tracking all 8 mice without mix-up. c Time-lapse analysis of 6 socially housed mice in a circular chamber. Tracking data (lower panels) for the 6 mice are merged for easy viewing. MAPS succeeded in tracking all mice even when they crossed over other mice