TACHISTOSCOPE

[ta.chis.to.scope] n [Gk tachistos (superl. of tachys swift) + ISV -scope] (ca. 1890): an apparatus for the brief exposure of visual stimuli that is used in the study of learning, attention, and perception -- ta.chis.to.scop.ic adj -- ta.chis.to.scop.i.cal.ly adv