When a person acts on a personal prejudiced beliefs and discriminates against someone based on imagined differences between them, this is referred to as:

Individual racism

Explanation:

When discrimination is done on the belief that one race is superior to another it is known as racism.

When a person discriminates on the basis of differences the person of another race has which are completely created or imagined in the person's mind. This definition was given by Henry and Tator in 2006.

Hence, the statement here refers to individual racism.

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.