from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An apparatus that projects a series of images onto a screen at rapid speed to test visual perception, memory, and learning.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a device that displays a series of brief images; used by psychologists to investigate perception, memory and learning

from the GNU version of the Collaborative International Dictionary of English

  • n. An apparatus for exposing briefly to view a screen bearing letters or figures. It is used in studying the range of attention, or the power of distinguishing separate objects in a single impression.

from The Century Dictionary and Cyclopedia

  • n. In experimental psychology, an apparatus which exposes to view, for a brief and accurately variable time, an object or small group of objects (letters, short words, etc.).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. scientific instrument used by psychologists; presents visual stimuli for brief exposures


Greek takhistos, superlative of takhus, swift + -scope.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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