What Are The Three Major Categories Of Psychoactive Substances
The three major categories of psychoactive substances are stimulants, opiates, and hallucinogens. According to Stephen F. Davis (2009), psychoactive substances are drugs or chemicals that have the power to alter the consciousness, perception, mood, and behavior. Psychoactive substances affect mental processes and can be used to treat physical and psychological disorders. There are many different types of psychoactive substances but most of them fall under the three major categories which are stimulants, opiates, and hallucinogens. Stimulants are one of the classes of psychoactive substances. According to David G. Myers (2015), “a stimulant excites neural activity and speeds up body functions.” Stimulants temporarily enhance the activity