21 September 2006

Aliens, demons, fairies, angels, and the brain

LiveScience offers us an article with the irresistable title Creepy Experiment Exposes Paranoia and Sense of Alien Control.
The young woman went to doctors to have them probe her brain, to root out where her seizures came from. But unexpectedly, their investigations and the procedure they performed led her to experience the creepy illusion of a person standing behind her, where nobody was actually present.

The patient described the illusory person as young and of indeterminate sex, a “shadow” who did not speak or move. “He is behind me, almost at my body, but I do not feel it,” she reported.

When the patient sat and embraced her knees with her arms, she noted the “man” was now also sitting and clasping her in his arms, which she described as unpleasant. When asked to read a card in her right hand, she noted the shadow tried to interfere, saying, “wants to take the card” and “he doesn't want me to read.”
The researchers found stimulating a region known as the left temporoparietal junction caused the woman to feel the presence of a shadowy person.

The temporoparietal junction is involved in distinguishing self from other and integrating body-related sensory information. Since the shadowy person closely mimicked the woman, the researchers propose she was experiencing an illusion based on her own body. This effect is a symptom of schizophrenia, and the scientists noted hyperactivity in the temporoparietal cortex of schizophrenics could lead to include the sensation that one's actions are being performed by someone else.

Fascinating stuff.

But, I gotta say, “the young woman went to doctors to have them probe her brain” and then she had some paranoid hallucinations. There's a part of me that says that it ain't exactly a surprise, y'know?

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