Does “mind” has any physical reality in biology? Or is it just an assumptive concept?

Does “mind” has any physical reality in biology? Or is it just an assumptive concept?

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Biologically, Brain controls our thinking, ideas, decisions everything along with controlling each body parts. My question is, is there anything real as "mind "? If it's controlled by brain then how does brain controls the mind?

The mind is an abstraction which arises from physical and chemical processes within the brain. For a crude analogy, think of the brain as an incredibly complex, self-modifying, multithreaded program. The mind would then be the abstraction arising from the behavior of the program as it runs. Consciousness would be the abstraction arising from the behavior of one particular thread in the program: a thread which has access to a limited buffer of its own (that thread's) behavior, and control over limited input and output from the body. All of the other (unconscious) threads may affect the conscious thread, but the conscious thread has very limited access to information about the behavior of the other threads.

Since the conscious part of the mind has access to information about its own behavior, there is actually some recursive looping going on when it comes to thinking and feeling. The feeling that this goes in circles somehow (which you seem to be expressing) is a common intuition, and it's almost certainly a correct one. But the manner in which this occurs is not well-understood, and it's definitely not well-understood within biology at the macro level because the brain is unbelievably complex and plastic. We really don't have a clue how to begin modeling the brain's processes. This is one reason artificial intelligence is still extremely crude today (despite what Elon Musk and Bill Gates may try to say).

If you want to read a scientifically-inspired theory of from whence consciousness comes, and of how it arises from the brain, I would recommend the book Godel, Escher, Bach by Douglas Hofstadter. Douglas does a good job of combining computational theory with biology, music, and art to illustrate a theory of consciousness the reader can grasp even if you don't have a strong background in any of those subjects.

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