The effect of cannabis on time perception has been studied with inconclusive results.[1] Studies show consistently throughout the literature that most cannabis users self-report the experience of a slowed perception of time.[2][3] In the laboratory, researchers have confirmed the effect of cannabis on the perception of time in both humans and animals.[4] Studies have sought to explain how cannabis changes the internal clock. Matthew et al. (1998) looked at the cerebellum, positing a relationship between cerebellar blood flow and the distortion of time perception.[5]