Fig. 7

Historical change in home cage monitoring techniques for laboratory mice and rats (data obtained from n = 520 publications). More than one technique could be indicated in a publication. If one of the techniques used to investigate parameters of interests could not be extracted from the publication but information on the degree of automatization was given, this technique was excluded for A and included for B. A Number of techniques used in the included publications in the defined time periods. Other: infrared thermometer (n = 1), automatic food dispenser (n = 1), impedance pneumography (n = 1), flowmeter circuit (n = 1), lever (n = 2), brain imaging cameras (n = 2), fiber photometry system (n = 1), cardiotachometer (n = 1), thermal imaging (n = 1). B Number of manual and automated techniques that were applied in the publications included