Past neuroscience and psychology studies have shown that people's expectations of the world can influence their perceptions, ...

The peripheral drift illusion causes us to perceive motion in a still image. A new study shows that the mechanism of this illusion relies on changes in pupil size.

Hallucinogen Persisting Perception Disorder, as defined by the DSM-5, is specifically caused by hallucinogenic drugs, primarily but not exclusively by LSD (lysergic acid diethylamide).