perceptual disturbance
a disorder of perception, such as (a) recognizing letters but not words, (b) inability to judge size or direction, (c) confusing background with foreground, (d) inability to filter out irrelevant sounds or sights, (e) a body-image distortion, or (f) difficulty with spatial relationships (e.g., misperceiving the difference between a straight line and a curved line). Also called perceptual disorder.