Meaning of AUTOKINETIC EFFECT in English

illusory movement of a single still object, usually the stationary pinpoint of light used in psychology experiments in dark rooms. As one stares at a fixed point of light, one's eye muscles become fatigued, causing a slight eye movement. Without the usual reference points available in the everyday environment, the movement of the image on the retina is perceived as its actual movement in space.

Britannica English vocabulary.      Английский словарь Британика.