Estimating the cardiac signals of chimpanzees using a digital camera: validation and application of a novel non-invasive method for primate research.

Results We found a highly significant effect of condition (i.e., video category) on the relative HR change from pre-baseline to video presentation ( X 2 = 9.91, df = 2, p = 0.002), i.e., heart rate changed differently depending on the video category.

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