“…The measurement of critical flicker fusion threshold (CFFT) has enjoyed a long tradition in experimental physiology, psychology and more recently psychopharmacology (Simonson and Brozek, 1952;Smith and Misiak, 1976;Ott and Kranda, 1982). It has been widely used to investigate antidepressants, anxiolytics and nootropic agents in young volunteers (Smith and Misiak, 1976;Hindmarch, 1980a;Alford and Hindmarch, 1990;Curran and Hindmarch, 1990).…”