Paddy Matthews

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Using surface electromyography the reflex response of flexor carpi radialis elicited by forcibly dorsiflexing the wrist was compared with that elicited by applying vibration percutaneously to its tendon. This was done both in patients with Parkinson's disease and in normal subjects. The reflexes were elicited on top of a pre-existing voluntary contraction(More)
One of the problems which the operator of a real-time process control system is faced with is that of understanding the output produced by the system. This has often involved the need for the operator to know about the variables and structures of the expert system controlling the process as well as those of the system which it is controlling. In thk paper,(More)
Vibration was applied to the tendon of flexor carpi radialis while recording the EMG of the wrist flexors in 29 Parkinsonian patients. Cessation of the vibration led to a small short-latency (approximately 25 ms) reduction in the level of activity which did not differ in magnitude from the normal. Moreover, there was no sign of any subsequent long-latency(More)
The wrist was rapidly dorsiflexed while the flexor muscles were being vibrated at 120 Hz. During both the M1 and the M2 responses the EMG showed a series of waves at the vibration frequency. When the vibration was turned off after overlapping with the stretch for only three to four cycles these EMG waves ceased about 30 ms later. Spinal reflexes are thus(More)
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