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HF whisking envelope distribution compensates for lost degrees of freedom.

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posted on 26.05.2020, 17:37 by Avner Wallach, David Deutsch, Tess Baker Oram, Ehud Ahissar

(A–B) Bivariate probability density distributions of whisking amplitude and offset (relative to head) for freely moving (A) and HF rats (B). While freely moving rats exhibit a preferred subspace of amplitude-offset combinations, HF rats cover much of the available envelope space (range of offsets is determined by the absolute bounds on whisker C2 angle in all data sets, 11–133 deg; maximal possible amplitude is offset dependent and peaks at the median offset at 61 deg). (C) Probability distribution of whisking envelope, taking into account head rotations, for free rats. (D) Whisking envelope information entropies for random subsets taken from each data set (box-and-whisker plots: horizontal line, median; box, IQR). Mean entropy is significantly smaller for freely moving rats (Free W, left) than for HF rats (center), indicating that the whisking envelope distribution is much more dispersed during head-fixing; however, there is no significant difference when head rotations are included in the analysis (Free W + H, right). ***p < 0.005. Inset: entropies calculated for entire data sets (free whiskers only 6.24 bits, HF 7.325 bits, free whiskers + head 6.97 bits). The data and analysis code for this figure can be found here: https://github.com/avner-wallach/Rat-Behavior.git. HF, head-fixed; IQR, Interquartile Range; n.s., not significant; PDF, Probability Density Function.