The hand that's shocked and able

Chinese neurosurgeon, Tian Hong, is bringing his patients relief from debilitating motor function disorders with skill and compassion, Li Yingxue reports.

Li Xiaoyun, 62, lies awake, blinking, as doctor Tian Hong finishes drilling two holes in her skull.

Into both of the freshly-bored cavities, each about 14 millimeters in diameter, he gently inserts a 1.25 mm probe electrode.