Assalam Alaykum,
I found the below quote from the Malfuzat of Hakimul Ummat Hadhrat Maulana Ashraf Ali Thanvi. Having read a self development book recently I can't help wondering how much Islam is owed for some of theories and bases for modern works on the subject.

192) The power of the mind is an accepted fact. I have heard the following episode from Maulana Muhammad Yaqub (rahmatullah alayhi):
"A man imagined that a lion attacked him and struck its paw against his back. So strong was his imagination that a lion's claw marks were discernible on his back. Even blood would flow from the wound of his imagination."

This is the reality of mesmerism. It is the assertion of the power of the mind. The claims of the appearance of arwah (soul) are all baseless. These things are all in the manifestations of the mind.