In arguing that current theories of brain function cast suspicion on ESP,
psychokinesis, reincarnation, and so on, I am frequently challenged with
the most popular of all neuro-mythologies -- the notion that we ordinarily
use only 10 percent of our brains...
This "cerebral spare tire" concept continues to nourish the clientele of
"pop psychologists" and their many recycling self-improvement schemes. As
a metaphor for the fact that few of us fully exploit our talents, who could
deny it? As a refuge for occultists seeking a neural basis of the miraculous,
it leaves much to be desired.
-- Barry L. Beyerstein,
-- "The Brain and Consciousness: Implications for Psi Phenomena",
-- The Skeptical Enquirer, Vol. XII, No. 2, pg. 171
While it cannot be proved retrospectively that any experience of
possessio conversion, revelation, or divine ecstasy was merely an
epileptic discharge, we must ask how one differentiates "real
transcendence" from neuropathies that produce the same extreme realness,
profundity, ineffability, and sense of cosmic unity....