The anterior insula, for instance, is what we use to reflect on the state of our own bodies to be aware of the sensation of butterflies in the stomach, say, or of lightness in the head. This technique can capture an image of the working brain in just a couple of seconds and locate areas of activity down to a millimeter or so—about one-twentieth of an inch. As expected, several of them are in the temporal lobe. Each of these stories contains a small clue about the enigmatic neuroscience of sex. In particular, a patch of neurons near the front of the brain—a region called the medial orbitofrontal cortex—was active in the desire-impaired men but quiet in the normal ones. Neuroscientists explore the mind's sexual side and discover that desire is not quite what we thought it was. The brain regions that handle self-awareness and understanding others may also be telling the emotional centers what to feel. Intriguingly, the pattern of neural action seen in the experiment does not follow an orderly progression from the vision-processing centers to the centers of emotion and finally to the lofty regions of self-awareness.
The anterior insula, for instance, is what we use to reflect on the state of our own bodies to be aware of the sensation of butterflies in the stomach, say, or of lightness in the head. A lot can happen in that time, especially when sex is involved. These programs can home in on regions just a few millimeters across , nearly as close as fMRI. The higher regions may be priming the visual cortex to be more sensitive to certain kinds of information—in essence, instructing the eyes on what kind of person looks sexually desirable. After all, epileptic bursts of electricity in the brain alone can trigger everything from desire to ecstasy. Despite the X-rays, Mrs. This technique can capture an image of the working brain in just a couple of seconds and locate areas of activity down to a millimeter or so—about one-twentieth of an inch. Most brain imaging technology works the way cameras did in the 19th century: Even fMRI studies are not fast enough to catch the flow of activity, however. But despite what Freud thought, sexual experiences are not just a matter of primal emotions and associations. What little they knew came from rare cases such as Mrs. In 80 percent of them, doctors pinpointed epilepsy in the temporal lobe. If you want a clear picture, you have to hold very still. As expected, several of them are in the temporal lobe. Ortigue and Bianchi-Demicheli suspect that several different parts of the brain are analyzing the information coming in from the eyes and influencing the final response. The other seven suffered from hypoactive sexual desire disorder. More recently, in , doctors in Taiwan described a woman who complained of orgasms that swept over her when she brushed her teeth. In two Florida doctors wrote to the journal Neurology about a patient who experienced similar spells of passion. From Top to Bottom. The parts of the brain that light up in the fMRI scans include regions that are associated with some of our most sophisticated forms of thought. Even then, brain scans provide meaningful information only in carefully designed experiments. The radioactive signal accumulated in areas where neurons became active, as their energy was replenished by the surrounding blood vessels. Brain regions that are associated with understanding the thoughts and intentions of other people also seem linked with sexual feelings. Using fMRI, scientists have pinpointed a number of regions of the brain that kick in when people feel sexual desire. The clinical examples also point to the parts of the brain that may be involved in sexual experiences.
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