What produce vivid and unusual changes in thought feelings and perceptions?

Psychedelic substances such as LSD, psilocybin (found in magic mushrooms), and DMT are known to produce vivid and unusual changes in thought, feelings, and perceptions by altering the brain's serotonin system. These substances can lead to intense experiences that may include visual and auditory hallucinations, distorted sense of time, and feelings of interconnectedness.