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This article argues in favor of using newly developed computerized, co
mplex reaction time (RT)-based neuropsychological procedures for the s
tudy of sports-related concussion. Recent studies show that by using t
hese complex RT procedures, significant differences between concussed
and control samples can be observed. The magnitude of RT differences i
s 110 ms or less, levels that are not meaningfully measured with stopw
atch-based procedures. RT-based procedures also have the advantage of
permitting analysis of variability of RT, and several recent studies h
ave shown that brain dysfunction is accompanied by erratic and inconsi
stent RT. A currently ongoing sports concussion study using measures o
f complex RT and variability of RT is described.