tachistoskop

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tachistoscope
scientific instrument used by psychologists; presents visual stimuli for brief exposures
a device that displays a series of brief images; used by psychologists to investigate perception, memory and learning
An apparatus for exposing briefly to view a screen bearing letters or figures
{i} device for assessing visual perception (Psychology)
It is used in studying the range of attention, or the power of distinguishing separate objects in a single impression