.
seriously trying to implement such a thing on the basis of an amplitudinal (or frequency-based in the case of breathing) standard deviation from whatever "baseline" they would arbitrarily program the poly to establish. The SD, btw, is a measurement of how far from the mean factors that contribute to the mean diverge, e.g., in 1 2 3 4 5 the mean is 3 and the SD is also 3.