a disorder of comprehension, like (i) identifying letters but not terms, (ii) incapacity to determine direction or size, (iii) confusing foreground with background, (iv) incapacity to weed out irrelevant noises or visuals, (v) a body-picture distortion, or (vi) trouble with spatial unions. Commonly referred to as perceptual disorder.

PERCEPTUAL DISTURBANCE: "Perceptual disturbances of many types can occur together or there may be only the presence of one type."

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