“…Other clinical and physiological abnormalities that have been reported in MDMA users include impulsivity (Morgan et al, 2006;Quednow et al, 2007), neuroendocrine dysfunction (Gerra et al, 1998(Gerra et al, , 2000(Gerra et al, , 2003McCann et al, 2000;Verkes et al, 2001), alterations in pain modulation (O'Regan and Clow, 2004), sleep architecture (Allen et al, 1993;Ricaurte and McCann, 2001), visual-evoked potentials (Casco et al, 2005), and event-related potentials (Mejias et al, 2005). Like cognitive function, all of these behavioral spheres are known to be influenced, in part, by brain 5-HT systems.…”