Altered states of consciousness induced by hallucinogens (H-ASC) is still a vaguely understood phenomenon. Taken the diverse psychological effects they exert, the main mechanism of action of hallucinogens; LSD, ibogaine, THC, PCP, MDMA, methamphetamine, mescaline, psilocybin and DMT, of which psychological effects are discussed in the article, are not properly understood and explained by the modern methods of neuroscience due to the lack of vigorous research. The involvement of some receptors, such as, 5-HT2 (and probably other 5-HT receptors), glutamate and dopamine receptors, adrenergic and cannabinoid receptors, is one of the mechanisms, however it is not easy to explain such incongruent psychological effects by only receptor and neurotransmitter systems alone, since H-ASCs have, sometimes, their own unity and gestalt, unfolding the subconscious, in the “voyages” they induce, although the perception may, or may not, be distorted depending on the person, and “set and setting”

Altered states of consciousness, Hallucinogen, LSD, ibogaine, PCP, THC, MDMA, Methamphetamine, Mescaline, Psilocybin, DMT