Fig. 2.

Automated somatosensory stimulator directed at a monkey hand. Left: 4 computer-controlled solenoid valves positioned above the monkey's hand started and stopped a stream of pressurized air. Air from an open valve passed through an adjustable hose and nozzle precisely positioned to stimulate a restricted portion of the hand. Right: the hand was secured to a stationary frame (gray) with loosely fitting zip ties (green). Once in place, this stimulator setup remained stationary through all recording epochs (baseline, cool, rewarm 1, rewarm 2).