Fig. 2.

Representative cutaneous silent period (CSP) responses following stimulation to digit 1 (D1, top row of tracings, four superimposed rectified trials), digit 3 (D3, middle row), and digit 5 (D5, bottom row) of patients with C6 (left column of tracings), C7 (middle column), and C8 radiculopathy (right column). Radiculopathies were documented by electromyography. CSP responses were recorded from the voluntarily contracting abductor pollicis brevis (APB) muscle. Note the complete CSP responses in all patients irrespective of level of radiculopathy or digit stimulated. Calibration bar: 20 ms, 1 mV