Some New Age proponents propagate this belief by asserting that the "unused" ninety percent of the human brain is capable of exhibiting psychic powers and can be trained to perform psychokinesis and extra-sensory perception. There is no scientifically verified body of evidence supporting the existence of such powers.
The closest I've ever heard to this claim is that of using meditation or yogas, where experimental evidence has shown development of the temporal lobe. I've also heard discussion of chakras, though this too is often cross-referenced back to meditation.
Is this garbage talk, or am I just not hanging out with enough new agers I wonder...