Answer:
Although he didn't exactly invent the idea, the theories of the unconscious mind, along with the conscious, was developed by Sigmund Freud.
Explanation:
Freud (1900, 1905) developed a topographical model of the mind, whereby he described the features of the mind’s structure and function. Freud used the analogy of an iceberg to describe the three levels of the mind.
On the surface is consciousness, which consists of those thoughts that are the focus of our attention now, and this is seen as the tip of the iceberg. The preconscious consists of all which can be retrieved from memory. The third and most significant region is the unconscious. Here lie the processes that are the real cause of most behaviour. Like an iceberg, the most important part of the mind is the part you cannot see.
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