This looks like a dangling participle to me, Camlearner. "Hard to detect" doesn't seem to refer to "mind", but rather to something that the mind can perceive. This mistake is similar to the classic: Baked to a golden-brown crisp, most cooks will love this casserole. Of course, the cooks aren't baked, but the casserole is. The sentence should read: Baked to a golden-brown crisp, this casserole is loved by many cooks.
So, you have found an error in the grammar of the sentence in your example.