tachistoscope

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ta·chis·to·scope

(tă-kis'tŏ-skōp),
An instrument to determine the shortest time necessary for an object to be perceived.
[G. tachistos, very rapid, fr. tachys, rapid, + skopeō, to view]

tachistoscope

(tă-kĭs′tə-skōp′, tə-)
n.
An apparatus that projects a series of images onto a screen at rapid speed to test visual perception, memory, and learning.

ta·chis′to·scop′ic (-skŏp′ĭk) adj.

tachistoscope

[təkis′təskōp′]
Etymology: Gk, tachistos, rapid, skopein, to view
a device used to increase the speed of visual perception by displaying visual stimuli only extremely briefly.

tachistoscope 

An instrument that presents visual stimuli for a brief and variable period of time (usually less than 0.1 s).
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