Preface -- Chemistry and structure-activity relationships of psychedelics -- Hallucinogens and serotonin 5-HT2A receptor-mediated signaling pathways -- Effects of hallucinogens on neuronal activity -- Interactions of Hallucinogens with the Glutamatergic System: Permissive Network Effects Mediated Through Cortical Layer V Pyramidal Neurons -- The effects of hallucinogens on gene expression -- Effect of Hallucinogens on Unconditioned Behavior -- Hallucinogens in Drug Discrimination -- Phenomenology, structure and dynamic of psychedelic states -- Serotonergic hallucinogen-induced visual perceptual alterations -- New world tryptamine hallucinogens and the neuroscience of ayahuasca -- Experimental psychosis research and schizophrenia - similarities and dissimilarities in psychopathology -- A review of Hallucinogen Persisting Perception Disorder (HPPD) and an exploratory study of subjects claiming symptoms of HPPD -- Therapeutic applications of classic hallucinogens -- Classic Hallucinogens and Mystical Experiences: Phenomenology and Neural Correlates.