tachistoscope

American  

[tuh-kis-tuh-skohp] / təˈkɪs təˌskoʊp /

noun

Psychology.

1. an apparatus for use in exposing visual stimuli, as pictures, letters, or words, for an extremely brief period, used chiefly to assess visual perception or to increase reading speed.

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tachistoscope British  

/ təˌkɪstəˈskɒpɪk, təˈkɪstəˌskəʊp /

noun

1. an instrument, used mainly in experiments on perception and memory, for displaying visual images for very brief intervals, usually a fraction of a second

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Other Word Forms

• tachistoscopic
  adjective
• tachistoscopically
  adverb

Etymology

Origin of tachistoscope

1905–10; < Greek táchist ( os ), superlative of tachýs swift + -o- + scope