noun Psychology.
- 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.
noun
- an instrument, used mainly in experiments on perception and memory, for displaying visual images for very brief intervals, usually a fraction of a second
n.
- An apparatus that projects a series of images onto a screen at rapid speed to test visual perception, memory, and learning.