Perky effect

Etymology
Named after (1874–1940), American psychologist, who carried out a related experiment in which subjects were asked to visualize various objects on a screen while, unknown to them, very faint patches of color resembling these objects were projected onto the screen.

Noun

 * 1) The phenomenon whereby sensory input, or perceptions, can be mistaken for a mental image when perceptual processes and mental imagery interfere with each other.

Translations

 * Finnish: Perky-ilmiö
 * German: Perky-Effekt
 * Polish: efekt Perky