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After psilocybin treatment, subjects were limited in their ability to reproduce interval lengths longer than 3 seconds, to synchronize a motor response to intervals longer than 2 seconds and were limited in the ability to slow down the personal tapping tempo. There was no impairment for shorter intervals on the sensorimotor synchronization and reproduction task. Psilocybin also induced working-memory deficits and subjective changes in conscious state. These results indicate the contribution of the serotonin receptor system to the processing of time intervals longer than 2-3 seconds and in the voluntary control of the speed of movement. The results are limited by the small sample size and the use of only healthy subjects.