MEASURING SPIRITUAL FORCE

     In survey after survey since the 1960s, between 30 and 40 percent or so of those asked say they have, at least once or twice, felt "very close to a powerful, spiritual force that seemed to lift you out of yourself." Gallup polls in the 1990s found that 53 percent of American adults said they had had "a moment of sudden religious awakening or insight." Reports of mystical experience increase with education, income and age (people in their 40s and 50s are most likely to have them).

Yet many people seem no more able to have such an experience than to fly to Venus. One explanation came in 1999, when Australian researchers found that people who report mystical and spiritual experiences tend to have unusually easy access to subliminal consciousness. "In people whose unconscious thoughts tend to break through into consciousness more readily, we find some correlation with spiritual experiences," says psychologist Michael Thalbourne of the University of Adelaide. Unfortunately, scientists are pretty clueless about what allows subconscious thoughts to pop into the consciousness of some people and not others. The single strongest predictor of such experiences, however, is something called "dissociation." In this state, different regions of the brain disengage from others. "This theory, which explains hypnotizability so well, might explain mystical states, too," says Michael Shermer, director of the Skeptics Society, which debunks paranormal phenomena. "Something really seems to be going on in the brain, with some module dissociating from the rest of the cortex."

THE NEURAL BASIS FOR RELIGIOUS EXPERIENCE

     That dissociation may reflect unusual electrical crackling in one or more brain regions. In 1997, neurologist Vilayanur Ramachandran told the annual meeting of the Society for Neuroscience that there is "a neural basis for religious experience." His preliminary results suggested that depth of religious feeling, or religiosity, might depend on natural-not helmet-induced-enhancements in the electrical activity of the temporal lobes.

Interestingly, this region of the brain also seems important for speech perception. One experience common to many spiritual states is hearing the voice of God. It seems to arise when you misattribute inner speech (the "little voice" in your head that you know you generate yourself) to something outside yourself. During such experiences, the brain's Broca's area (responsible for speech production) switches on. Most of us can tell this is our inner voice speaking. But when sensory information is restricted, as happens during meditation or prayer, people are "more likely to misattribute internally generated thoughts to an external source," suggests psychologist Richard Bentall of the University of Manchester in England in the book  

"Varieties of Anomalous Experience."

Stress and emotional arousal can also interfere with the brain's ability to find the source of a voice, Bentall adds. In a 1998 study, researchers found that one particular brain region, called the right anterior cingulate, turned on when people heard something in the environment-a voice or a sound-and also when they hallucinated hearing something. But it stayed quiet when they imagined hearing something and thus were sure it came from their own brain. This region, says Bentall, "may contain the neural circuits responsible for tagging events as originating from the external world." When it is inappropriately switched on, we are fooled into thinking the voice we hear comes from outside us.

Even people who describe themselves as nonspiritual can be moved by religious ceremonies and liturgy. Hence the power of ritual. Drumming, dancing, incantations-all rivet attention on a single, intense source of sensory stimulation, including the body's own movements. They also evoke powerful emotional responses. That combination-focused attention that excludes other sensory stimuli, plus heightened emotion-is key. Together, they seem to send the brain's arousal system into hyperdrive, much as intense fear does. When this happens, explains Newberg, one of the brain structures responsible for maintaining equilibrium-the hippocampus-puts on the brakes.

It inhibits the flow of signals between neurons, like a traffic cop preventing any more cars from entering the on-ramp to a tied-up highway.

'SOFTENING OF THE BOUNDARIES OF THE SELF'

     The result is that certain regions of the brain are deprived of neuronal input. One such deprived region seems to be the orientation area, the same spot that goes quiet during meditation and prayer. As in those states, without sensory input the orientation area cannot do its job of maintaining a sense of where the self leaves off and the world begins. That's why ritual and liturgy can bring on what Newberg calls a "softening of the boundaries of the self"-and the sense of oneness and spiritual unity. Slow chanting, elegiac liturgical melodies and whispered ritualistic prayer all seem to work their magic in much the same way: they turn on the hippocampus directly and block neuronal traffic to some brain regions. The result again is "blurring the edges of the brain's sense of self, opening the door to the unitary states that are the primary goal of religious ritual," says Newberg.

Researchers' newfound interest in neurotheology reflects more than the availability of cool new toys to peer inside the working brain. Psychology and neuroscience have long neglected religion. Despite its centrality to the mental lives of so many people, religion has been met by what David Wulff calls "indifference or even apathy" on the part of science. When one psychologist, a practicing Christian, tried to discuss in his introductory psych book the role of faith in people's lives, his publisher edited out most of it-for fear of offending readers. The rise of neurotheology represents a radical shift in that attitude.

And whatever light science is shedding on spirituality, spirituality is returning the favor: mystical experiences, says Forman, may tell us something about consciousness, arguably the greatest mystery in neuroscience. "In mystical experiences, the content of the mind fades, sensory awareness drops out, so you are left only with pure consciousness," says Forman. "This tells you that consciousness does not need an object, and is not a mere byproduct of sensory action."

For all the tentative successes that scientists are scoring in their search for the biological bases of religious, spiritual and mystical experience, one mystery will surely lie forever beyond their grasp. They may trace a sense of transcendence to this bulge in our gray matter.  

And they may trace a feeling of the divine to that one. But it is likely that they will never resolve the greatest question of all-namely, whether our brain wiring creates God, or whether God created our brain wiring. Which you believe is, in the end, a matter of faith.