This refers to the conscious, strategic, speculating, calculating, initiating "I" and the subconscious, spontaneous, reacting, intuitive "Me."
Cognitive psychologists sometimes refer to them as "system two" and "system one" respectively. System one receives an enormous quantity of information through the senses; system two receives only a greatly reduced, filtered version.
The central problem for the actor is to learn to let the "I" let go and release the "Me."
One has to educate the actor's "I, but more important is to train the actor's "Me."