Illustration (IMAGE)
Caption
Accelerometers are deployed to non-invasively measure sleep behavior in a group of wild baboons. Mounted inside collars, the accelerometers monitor and record fine-scale movements of baboons along the x- (yellow), y- (blue), and z-axes (red). An algorithm then assesses the amount of movement in the three axes within a given time period, and classifies the behavior during that period as sleep (XX shading) or waking (YY shading). To confirm that the algorithm’s classification of sleep and waking is correct, baboons are also observed in their sleep site using infrared video recordings (inset). The method makes it possible to monitor the sleep of an entire group of wild baboons simultaneously and continuously. By doing so, the study finds that animals in the wild face ecological and social demands that can disrupt sleep homeostasis.
Credit
Mike Costelloe for Max Planck Institute of Animal Behavior
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