The psychoanalytic theories of Sigmund Freud are often considered as the foundational concept of modern psychology. Freud’s theories revolved around the concept of the unconscious mind – the notion that our conscious mind, or the part of the brain that is in control of our thoughts, is only the tip of the iceberg, and that our unconscious mind is a far larger entity that holds the deepest secrets of our personality.

In terms of understanding the nervous disorders he observed, Sigmund Freud considered the unconscious mind to be the key. He believed that the unconscious mind was where the root of many psychological issues were found, and that by targeting the unconscious mind, rather than the conscious mind, he could effectively treat a range of psychological disorders.

Freud’s theories on the role of the unconscious mind in psychological disorders have been disputed by some, but many of his ideas remain foundational in modern psychology. Additionally, Freud’s concepts have also been used to explain many different types of psychological disorders, ranging from depression to anxiety. From Freud’s perspective, understanding the unconscious mind was key to understanding the nature of psychological disorders.