Concordance between baseplate-derived ambulatory activity and overall movement within the cage by video analysis.

<p>Overlay plot from one cage of 3 rats (a) and correlation plot for 2 cages of 3 rats (b) of ambulatory movement of the rats derived from the baseplate RFID reader versus side-view pixel movement detection, for the ventral midline site (after ‘shielding upgrade’), over 7 consecutive days of recording. Data are plotted as the mean of 3 rats per cage (2 cages), in 30-minute bins. For the overlay plot (a), the red line is mean transitions derived from the baseplate, the blue line is the total pixel movement derived from the side-view HD video; light and dark phases are indicated by the shading. Note that the video motion analysis reflects all movement (not just ambulatory activity), and may at times be exaggerated by a rat in the foreground grooming (for example).