SUBJECTS, MATERIALS, AND METHODS DRUG ADMINISTRATION HALLUCINOGEN RATING SCALE STATISTICS RESULTS 0.4-MG/KG DOSE PERCEPTION SOMAESTHESIA AFFECT COGNITION VOLITION INTENSITY 0.2-MG/KG DOSE 0.1-MG/KG DOSE 0.05-MG/KG DOSE HALLUCINOGEN RATING SCALE TECHNICAL COMMENT ON ASSESSMENT OF SUBJECTIVE EFFECTS COMMENT REFERENCES