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Cutaneous sensory thresholds were measured at the index fingertipof eight normal subjects. Electric shocks were applied with the finger at rest or tracking a target, which oscillated at one of three frequencies. For each subject, the sensory threshold was positively correlated with the frequency of oscillation. The correlations between sensory suppression(More)
Previous work has suggested that normal subjects are able to recognize and correct their own errors of movement without using exteroceptive signals. This ability may be impaired in schizophrenia. Twelve normal subjects, 12 alcoholics, and 14 schizophrenics performed a step-function tracking task designed to prevent the use of exteroceptive signals in(More)
Stretch and unloading reflexes were demonstrated in the first dorsal interosseous muscle by averaging the electromyographic responses to brief mechanical stimuli. Subjects were not able to abolish these reflexes by altering their preparatory set. When subjects were prepared to contract or relax the muscle in response to a stretching force, the size of the(More)
  • R W Angel
  • 1987
The unloading reflex of abductor hallucis brevis was elicited by removal of the external load during voluntary contraction. The duration of the unloading pulse was varied experimentally from 1 to 32 msec. With all stimulus durations, the response was a measurable decrease in the level of EMG activity. Expressed as a percentage change from baseline, the mean(More)
On a two-choice tracking test of normal subjects, numerous false moves were induced when the directional relation between movement of the hand and the response marker was changed. The mean error-correction times were not consistently less than simple reaction times. When the center of the display was screened to eliminate visual feedback, numerous moves(More)