Final answer:
A prefrontal lobotomy was a psychiatric procedure performed in the mid-20th century to treat various disorders, primarily personality disorders, mood disorders, and psychoses.
Step-by-step explanation:
A prefrontal lobotomy was a psychiatric procedure commonly performed in the 1940s and early 1950s to treat various disorders. It involved severing the connections between the prefrontal cortex and other areas of the brain. The procedure was mainly used for personality disorders, mood disorders, and psychoses, but its effectiveness and the exact correlation between cutting the white matter of the prefrontal cortex and changes in mood and personality are not well understood.