Hallucinogen Rating Scale
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The Hallucinogen Rating Scale (HRS) is a psychometric scale for measuring the subjective effects of hallucinogens like psychedelic drugs and other psychoactive drugs.[1][2][3][4] It includes 100 items that are mostly on a 5-point Likert scale and 6 factors/subscales (somaesthesia, affect, perception, cognition, volition, and intensity).[1][3][4] The HRS is one of the most widely used scales for measuring hallucinogen effects, following the 5D-ASC and 11-ASC scales.[1][2][3][5] It has been revised several times and has been translated into and validated in several different languages.[3][4][6][7] The HRS was developed by Rick Strassman and colleagues and first described in 1992.[3][8][9][10] It was first developed and used to assess the hallucinogenic effects of the psychedelic drug dimethyltryptamine (DMT).[1][3][4] Subsequently, it has also been used with a variety of other psychoactive drugs, including psilocybin, ayahuasca, 2C-B, meta-chlorophenylpiperazine (mCPP), ketamine, dextromethorphan (DXM), salvinorin A/Salvia divinorum, Δ9-tetrahydrocannabinol (THC), d-amphetamine, d-methamphetamine, 4-fluoroamphetamine, methylphenidate, MDMA, and MDEA.[1][2][5][7]
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