Figure 3: Counting the steps walked. | Scientific Reports

Figure 3: Counting the steps walked.

From: Simple platform for chronic imaging of hippocampal activity during spontaneous behaviour in an awake mouse

Figure 3

(A) Illustration of mouse during a step, where the right then left fore-limb grabs the wheel bars. The heatmap shows principal component maps of the forelimb grabbing in a 4-min movie. Scale bar, 10 mm. (B) Autocorrelation functions for the right leg (blue), left leg (red), and instantaneous speed (grey, thick line), as well as the cross-correlations between the two legs (black). (C) Illustrations of channel A (black), left leg (blue), right leg (red), and speed (grey). Note the downward deflections of the leg signals (arrows) whereas the speed signal oscillates. (D) Relationship between the step occurrence and the median speed, with a red line indicating the least squares fit for the left leg. Pearson’s correlation coefficient: r = 0.985, p < 0.001. (E) Distribution histogram of the step length obtained from the right (blue) and left (red) legs (left) and boxplots (right) showing the distribution of the step length from both limbs (blue/red) and the distance between two cycles of the speed signal (gray).

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