Electrophysiological correlates of changes in reaction time based on stimulus intensity.

PloS One
B LakhaniWilliam E McIlroy

Abstract

Although reaction time is commonly used as an indicator of central nervous system integrity, little is currently understood about the mechanisms that determine processing time. In the current study, we are interested in determining the differences in electrophysiological events associated with significant changes in reaction time that could be elicited by changes in stimulus intensity. The primary objective is to assess the effect of increasing stimulus intensity on the latency and amplitude of afferent inputs to the somatosensory cortex, and their relation to reaction time. Median nerve stimulation was applied to the non-dominant hand of 12 healthy young adults at two different stimulus intensities (HIGH & LOW). Participants were asked to either press a button as fast as possible with their dominant hand or remain quiet following the stimulus. Electroencephalography was used to measure somatosensory evoked potentials (SEPs) and event related potentials (ERPs). Electromyography from the flexor digitorum superficialis of the button-pressing hand was used to assess reaction time. Response time was the time of button press. Reaction time and response time were significantly shorter following the HIGH intensity stimulus compared to...Continue Reading

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Citations

Apr 5, 2013·Experimental Brain Research·Leigh A Mrotek
Jul 31, 2013·Experimental Brain Research·Bimal LakhaniWilliam E McIlroy
Sep 1, 2015·Neuroscience and Biobehavioral Reviews·D A E Bolton
Jun 29, 2014·Neuroscience Research·David A E BoltonWilliam E McIlroy
Sep 10, 2019·The Journal of Physiology·Richard G Carson, Alison R Buick
Apr 3, 2020·Journal of Neural Engineering·Aida Hejlskov PoulsenCarsten Dahl Mørch

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