A live recording of muscle activity from Dr. Jessell's biceps and triceps muscles.
Electrical activity recorded from the leg muscles reveals different patterns of activation during different gaits.
Dr. Ronald Evans discusses the so-called "marathon" mouse, with a mutation in the PPAR-gamma gene, and its performance on a treadmill relative to a normal mouse.
Dr. Huda Zoghbi interviews Milan Cloud, a patient who has inherited the neurological disorder spinocerebellar ataxia 1, or SCA1.
A Taser hyperexcites the nervous system to cause a rigid immobilization of its target.
Proprioceptive feedback makes it easy to touch one's thumb to one's fingers without looking.
In a giraffe's walk, left and right limbs move alternately, while in a kangaroo's hop, opposing limbs move together.
A person with a disease that kills proprioceptive neurons has severe problems with the simplest of movements.