A startling acoustic stimulus facilitates voluntary lower extremity movements and automatic postural responses in people with chronic stroke

Journal of Neurology
Milou J M CoppensVivian Weerdesteyn

Abstract

A startling acoustic stimulus (SAS) involuntary releases prepared movements at accelerated latencies, known as the StartReact effect. Previous work has demonstrated intact StartReact in paretic upper extremity movements in people after stroke, suggesting preserved motor preparation. The question remains whether motor preparation of lower extremity movements is also unaffected after stroke. Here, we investigated StartReact effects on ballistic lower extremity movements and on automatic postural responses (APRs) following perturbations to standing balance. These APRs are particularly interesting as they are critical to prevent a fall following balance perturbations, but show substantial delays and poor muscle coordination after stroke. Twelve chronic stroke patients and 12 healthy controls performed voluntary ankle dorsiflexion movements in response to a visual stimulus, and responded to backward balance perturbations evoking APRs. Twenty-five percent of all trials contained a SAS (120 dB) simultaneously with the visual stimulus or balance perturbation. As expected, in the absence of a SAS muscle and movement onset latencies at the paretic side were delayed compared to the non-paretic leg and to controls. The SAS accelerated ankl...Continue Reading

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Citations

Nov 7, 2019·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Anthony N Carlsen, Dana Maslovat
Jan 5, 2021·Experimental Brain Research·Marziye RahimiClaire F Honeycutt
Mar 6, 2021·Journal of Neuroscience Research·Brice T Cleland, Sangeetha Madhavan

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Software Mentioned

SPSS
non
SAS
StartReact
MATLAB

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