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The frequency of involvement of areas from most to least common are as follows: symmetrical lesions of the medial thalami, periventricular regions of the third ventricle, peri-aqueductal areas, mamillary bodies, tectal plate and dorsal medulla.
At first they thought it was a tectal glioma, a tumor made up of brain cells, and they scheduled me for surgery," Haley says.
For comparison, researchers analyzed a swimming paramecium and analyzed its tectal activity during perception of a natural object, comparing it to the tectal response of its free-swimming larval fish.