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There could be two reasons for this, Komisaruk said. One is indirect: Stimulating the nipples, as in breast-feeding, releases the hormone oxytocin. What was missing, Komisaruk said, was a study tracing those four nerves to where in the brain they send their signals. The genital-sensing brain areas in women roughly correspond to the same areas in men, but the nipple finding was a surprise, said study researcher Barry Komisaruk, a psychologist at Rutgers University. If you imagine wearing earmuffs, the medial paracentral lobule would be on the top of your head, right under the band of the earmuffs. For many women, nipples are erogenous zones. More broadly, he wants to find out if people can learn to control their brain activity directly, much as we take for granted our ability to move our fingers and toes.

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Komisaruk hopes his research will help people who can't reach orgasm.

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Four major nerves bring signals from women's genitals to their brains, Komisaruk said. For many women, nipples are erogenous zones. Komisaruk hopes his research will help people who can't reach orgasm. However, preliminary data suggest that nipple nerves may directly link up with the brain, skipping the uterine middleman.

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