Discussion of imalsogreg's comment: (EDIT: They do this in Fig. 5. Great!) Using mouse 'mean instantaneous open-field velocity' as a behavioral readout: not a good fit to the data. It would have been more informative to show the running-notRunning transition probabilities, and the running speeds in just the subset of trials where mice were running the whole time. Is this effect about speed, or likelihood of running?