AMPH and attention deficit-hyperactivity disorder: Our observation that AMPH facilitates attentional processing adds to previous studies reporting pro-attentional effects of psychostimulants in healthy humans (e.g. metanalyses (Marraccini et al. 2016)) and ADHD patients (e.g. Losier et al. 1996; Faraone and Biederman 2002; Faraone and Buitelaar 2010).