Definitions:

1. A device that displays a series of brief images, used by psychologists to investigate perception, memory and learning. NOUN
   • Military personnel employed the tachistoscope to stimulate combat situations and improve target discrimination.
2. A device that flashes images, words, or symbols for a very short time to study perception, attention, and learning, commonly used in psychological and educational experiments. NOUN
   • The researcher used a tachistoscope to measure how fast participants could recognize letters shown for just milliseconds.
3. An instrument used for exposing objects to the eye for very brief measured period of time. NOUN
   • The tachistoscope rapidly flashed a sequence of images to test the limits of visual perception.

Synonyms:

• perception tester
• t-scope
• visual display device.
• visual stimulator