“…Another potentially important behavioral indicator of neural processing efficiency is intra-individual variability (IIV) of RTs, which yields information that is distinct from mean RT. Numerous studies have documented an inverse relationship between behavioral performance consistency and moment-to-moment brain signal variability (Fjell et al, 2011;Garrett et al, 2014Garrett et al, , 2020Grady & Garrett, 2018;Johnson et al, 2015;Kelly et al, 2008;McIntosh et al, 2008;Mennes et al, 2011;Roberts et al, 2022;Wang et al, 2017). Furthermore, elevated IIV has been associated with a history of sport-related concussion (McGowan et al, 2018(McGowan et al, , 2019Merritt et al, 2019Merritt et al, , 2021Parks et al, 2015;Rabinowitz & Arnett, 2013;Wong et al, 2023).…”