Illustration from Scientific Research

The movements of hindlimb joints were tracked from the side at 300 fps in a linear corridor during spontaneous locomotion (Spont) and during optogenetic-evoked locomotion with a 470-nm laser (10-s train, 20 Hz, 10-ms pulses) (Opto). The angles of the hip, knee, ankle, and metatarsophalangeal (MTP) joints were calculated frame by frame.

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