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The effects of hallucinogens are most closely related to serotonin, a neurotransmitter that plays a crucial role in mood regulation, perception, and cognition. Many hallucinogens, such as lysergic acid diethylamide (LSD) and psilocybin, exert their psychoactive effects primarily by interacting with serotonin receptors, particularly the 5-HT2A receptor. This interaction leads to alterations in sensory perception, mood, and thought processes, which are characteristic of hallucinogenic experiences.

Serotonin's involvement in mood and perception explains why hallucinogens can lead to profound changes in consciousness, visual distortions, and altered states of awareness. Understanding the role of serotonin is critical for recognizing how these substances affect the brain and contribute to their complex effects on human experience.