Freud is considered as the father of modern psychology. His theories and ideas about the connections between the conscious mind, the subconscious mind, the body, and the world around us are still widely known today.
The most visible impact of Freud was on how society thought about and dealt with mental illness. Prior to Freud's invention of psychoanalysis, mental illness was almost universally thought to be 'organic,' that is, caused by some kind of deterioration or disease of the brain.
Theoretically, research on treating mental illness was primarily concerned with determining which types of changes in the brain led to insanity. Many diseases did not show obvious signs of physical difference between healthy and diseased brains, but it was assumed that this was simply due to insufficient techniques for detecting the differences. His work was so well-known that it forever altered the fields of psychiatry and psychology. People devoted their lives to either proving or disproving his theories.
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