Sensitivity was 15 μV/division, sweep speed was 2 ms/division, duration of pulse was 0.1–0.4 ms, and the machines used were a Tektronix type 122 preamplifier and a Tektronix type 564 B storage oscilloscope; low frequency filter, high-frequency filter and rate of pulse were not specified.
This study was performed in the supine position.
Following the orthodromic method [
1], signals were recorded using surface electrodes (10-mm disks or standard rings) from the median and ulnar nerves separately (Fig.
1). For the median nerve (R1) and ulnar nerve (R2), the active recording electrodes (A) were placed proximal to the distal crease at the wrist, on the median and ulnar trunks, respectively. No fixed distances were mentioned in the text. The cathodes were placed proximally. Great care was taken to prevent the spread of stimulus to the adjacent digits by covering them with a nonconducting adhesive plaster, as it was found that a spread of stimulus through...
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