Clin Psychopharmacol Neurosci.  2021 May;19(2):303-312. 10.9758/cpn.2021.19.2.303.

Prediction of Locomotor Activity by Infrared Motion Detector on Sleep-wake State in Mice

Affiliations
  • 1Department of Psychiatry and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
  • 2Maumpyeonhan Psychiatric Clinic, Changwon, Korea
  • 3Department of Psychiatry, Pusan National University School of Medicine, Yangsan, Korea
  • 4Department of Pediatrics, Kosin University College of Medicine, Busan, Korea

Abstract


Objective
Behavioral assessments that effectively predict sleep-wake states were tried in animal research. This study aimed to examine the prediction power of an infrared locomotion detector on the sleep-wake states in ICR (Institute Cancer Research) mice. We also explored the influence of the durations and ways of data processing on the prediction power.
Methods
The locomotor activities of seven male mice in home cages were recorded by infrared detectors. Their sleep-wake states were assessed by video analysis. Using the receiver operating characteristic curve analysis, the cut-off score was determined, then the area under the curve (AUC) values of the infrared motion detector that predicted sleep-wake states were calculated. In order to improve the prediction power, the four ways of data processing on the prediction power were performed by Matlab 2013b.
Results
In the initial analysis of raw data, the AUC value was 0.785, but it gradually reached to 0.942 after data summation. The simple data averaging and summation among four different methods showed the maximal AUC value. The 10-minute data summation improved sensitivity (0.889) and specificity (0.901) significantly from the baseline value (sensitivity 0.615; specificity 0.936) (p < 0.001).
Conclusion
This study suggests that the locomotor activity measured by an infrared motion detector might be useful to predict the sleep-wake states in ICR mice. It also revealed that only simple data summation may improve the predictive power. Using daily locomotor activities measured by an infrared motion detector is expected to facilitate animal research related to sleep-wake states.

Keyword

Infrared detector; Locomotion; Sleep-wake state; Circadian rhythm; Validity; Mlog system
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