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Ah, found it. Distinct from phosphenes is Hallucinogen persisting perception disorder
Although certain visual aberrations can occur periodically in healthy individuals - e.g. afterimages after staring at a light, noticing the floaters that lay atop the surface of the eye, or seeing specks of light in a darkened room - the difference is a matter of degree. HPPD induces a hyper-sensitivity to ordinary visual phenomena that would otherwise be negligible in their strength. The disorder is thus capable of transforming mundane perceptual effects into a source of distress. In this respect, HPPD can be considered a "disinhibition of visual processing"(Psychedelic Drugs, Abraham, et al, pg. 1548). Yet it is important to emphasize that HPPD is chiefly responsible for creating new disturbances, rather than merely exacerbating those already in existence. It also should be noted that the visuals do not constitute hallucinations in the clinical sense of the word; people with HPPD recognize the visuals to be illusory and thus demonstrate no inability to determine what is real (in contrast to Schizophrenia and other disorders that are known for serious changes in perception).


It'd be nice if the battle were only against the right wingers, not half of the left on top of that — François in Paris
by Migeru (migeru at eurotrib dot com) on Sun Mar 23rd, 2008 at 05:09:42 PM EST
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