I recommend one of these options:

Mind Blank attempts to hide the mind from attack, making its parts unidentifiable.

Thought Shield cloaks the mind so as to hide first one part, then another. This defense can be kept up at all times, unlike the others.

Mental Barrier is a carefully built thought repetition wall which exposes only that small area.

Intellect Fortress is a defense which calls forth the powers of the ego and super-ego to stop attacks.

Tower of Iron Will relies only upon the super-ego to build an unassailable haven for the brain.