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VOLUNTARY STIMULUS-SENSITIVE JERKS AND JUMPS MIMICKING MYOCLONUS OR PATHOLOGICAL STARTLE SYNDROMES

THOMPSON, PD; COLEBATCH, JG; BROWN, P; ROTHWELL, JC; DAY, BL; OBESO, JA; MARSDEN, CD; (1992) VOLUNTARY STIMULUS-SENSITIVE JERKS AND JUMPS MIMICKING MYOCLONUS OR PATHOLOGICAL STARTLE SYNDROMES. MOVEMENT DISORD , 7 (3) 257 - 262.

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Abstract

Five patients who presented with stimulus-induced jerking as part of an apparent myoclonic or pathological startle syndrome are reported. Neurophysiological observations in these patients suggested the jerks were voluntary in origin. These included (a) variable latencies to the onset of stimulus induced jerks, (b) latencies were greater than that seen in reflex myoclonus of cortical or brainstem origin, and were (c) longer than the fastest voluntary reaction times of normal subjects, (d) variable patterns of muscle recruitment within each jerk and, (e) significant habituation with repeated stimulation. It is argued that these features are consistent with a voluntary origin for the jerks and enable them to be distinguished from the stereotyped electrophysiological characteristics of myoclonus of cortical and brainstem origin. Electrophysiological recordings may help identify patients with this form of psychogenic movement disorder.

Type: Article
Title: VOLUNTARY STIMULUS-SENSITIVE JERKS AND JUMPS MIMICKING MYOCLONUS OR PATHOLOGICAL STARTLE SYNDROMES
Keywords: MYOCLONUS, STARTLE SYNDROMES, VOLUNTARY MUSCLE JERKS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Clinical and Movement Neurosciences
URI: http://discovery.ucl.ac.uk/id/eprint/104512
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