Final answer:
The revolution in the treatment of mental disorders is marked by the depathologization of homosexuality, thanks to efforts by activists and changes in the American Psychiatric Association's DSM in 1973.
Step-by-step explanation:
In the history of the treatment of mental disorders, notable shifts occurred with reforms in the mental health systems and perspectives toward different behaviors and identities. One significant revolution was the depathologization of homosexuality, which was once categorized as a mental illness. Activist Frank Kameny and many others initiated a movement against the American Psychiatric Association's (APA) listing of homosexuality as a mental disorder, leading to its removal from the Diagnostic and Statistical Manual of Mental Disorders (DSM) in 1973. This moment reflected a broader societal shift towards more humane and scientifically valid treatments and understandings of mental health, rejecting past practices like electroshock therapy and lobotomies that were used based on outdated and prejudicial beliefs. The role of clinical psychologists transformed during this era, with many becoming agents of social change, and psychotherapy revolutionized the approach to mental health by focusing on talk therapy, group dynamics, and understanding the unconscious mind, a foundation largely popularized by Sigmund Freud.