The idea that there is a part of the mind that is not directly accessible to awareness but still drives a person’s thinking and behavior is most directly attributable to

Subconscious

Explanation:

Subconscious is outside of our awareness and it has stored feelings for example anxiety or conflict and also thoughts and memories.

It was explained by Sigmund Freud and he agreed that most of our feelings and thoughts in the subconscious are unpleasant and they can show in our dreams since we are not aware of it when we are awake.

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