Fig. 1.

Experimental set-up. A: schematic of the hand posture used during testing of precision grip and power grip. Raw EMG traces show activity in the first dorsal interosseous (FDI) muscle in control subject and a participant with spinal cord injury. B: traces show the average of 20 motor-evoked potentials (MEPs) in the FDI tested during precision grip tested with the transcranial magnetic stimulation coil in the latero-medial (LM), posterior-anterior (PA), and anterior-posterior (AP) orientation in a control subject. Note that latencies of MEPs elicited by AP- and PA-directed currents were longer compare with LM. Also note, that latencies of MEPs were longer with AP- compared with PA-directed currents. APB, abductor pollicis brevis.