Psychology is the key mind science because it is the understanding of how perception governs behaviour. How we think affects everything else.
Psychology is about understanding. It is about understanding people and the mind.
Human nature is perpetual. It is the same today as it was from ancient history.
So the principles of psychology are fixed and enduring. You will never need to unlearn what you learn about them.
Art being a thing of the mind, it follows that any scientific study of art will be psychology.
It may be other things as well, but psychology it will always be.
“A fundamental understanding of the human psyche is the essential key to successful magic” - Robert-Houdin (Father of Modern Magic)
Understanding psychology doesn’t mean you’ll always be aware of it or use it. The first step is to understand it, the next step is keeping it in awareness and using it.
Psychology consist of subtle differences but big distinctions. It is the little psychological subtleties that make all the difference.