Word: mri
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...rare. By some estimates, no more than 1 person in 350,000 believes he or she was born the wrong gender. Moreover, the portion of the brain that seems to be different in transsexuals is smaller than a pinhead. Even advanced imaging techniques, like the pet scan or mri, cannot detect such tiny variations. To do their research, the Dutch team, led by Dr. Dick Swaab, had to dissect the brains of transsexuals in autopsies and examine them under a microscope. Little wonder, then, that it took Swaab's team 11 years to find transsexual candidates, persuade them to donate...
...teaching hospital. His health-insurance company initially tried to talk Daniel Vonk, a teacher from Fernandina Beach, Florida, out of going to the Mayo branch in Jacksonville because its fees were so high. Vonk went anyway, on a referral from a sports-medicine specialist who had done an mri when he learned that an ache in Vonk's leg had persisted for more than a year. Mayo specialists diagnosed the problem as bone cancer and subjected Vonk to three operations; Vonk also spent six months in a partial body cast and a year on crutches. The bills were high...
...observation and experimentation. But science has finally begun to catch up with philosophy. Using sensitive electrodes inserted deep into the gray matter of test animals, researchers have watched vision as it percolates inward from the eye's retina to the inner brain. Powerful technologies such as magnetic resonance imaging (mri) and positron-emission tomography (PET) have also provided a window on the human brain, letting scientists watch a thought taking place, see the red glow of fear erupting from the structure known as the amygdala, or note the telltale firing of neurons as a long-buried memory is reconstructed. "What...
...Using an MRI scanner, Hanna Damasio has examined the living brains of hundreds of patients, and she and her husband have identified regions they think may serve as convergence zones in the brain's left hemisphere. An area in the temporal lobe pulls together information about the names of objects, animals and people, for instance, while another area in the frontal cortex appears to act as the nexus for verbs. Yet a third oversees the task of assembling nouns and verbs into sentences...
...general, men as a group excel at tasks that involve orienting objects in space-like reading a map without having to turn it so it lines up with the road. Women, on the other hand, seem to be more adept at communication, both verbal and nonverbal. Readings of mri scans suggest one reason: women seem to have stronger connections between the two halves (hemispheres) of their brain...