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Physical.
The brain quote website says that the definition of mind is the state, at any given time, of the faculties of thinking, willing, choosing, and the like; psychical activity or state.
Society for Psychical Research was created in 1882.
It is a physical change because the apple is still an apple and nothing changed the composition of what's in the apple.
The conscious and permanent subject of all psychical experiences, whether held to be directly known or the product of reflective thought; -- opposed to non-ego.
A change in a substance where one or more new substances form.
from one group to another
The best definition for the word undercurrent describes a move. Undercurrent is the tendency for a variance or underlying action that creates a change.
A change in a substance where one or more new substances form
The art of using language to persuade people to change their views
A change in a substance with no new substances being formed (Apex)
is a physical change. The popsicle is still a popsicle even if its freezed, nothing has changed with it but its physical appearance :)