spatial processing

Meaning: Spatial processing is the brain's handling of location, distance, orientation, and movement relative to objects. In vision, the dorsal stream (the where/how pathway) runs from the occipital lobe to the parietal lobe. The ventral stream (the what pathway) runs to the temporal lobe and identifies objects. In most people the right parietal lobe contributes strongly to spatial attention and mental rotation, while language is typically left-lateralized.

On the MCAT: A passage may describe a patient with parietal damage who can name an object but cannot reach for it accurately, or who ignores one side of space (hemispatial neglect, usually of the left side after right parietal damage). Questions ask which lobe or pathway is involved, or contrast this with temporal damage, which impairs recognizing objects (visual agnosia) while location judgments are relatively spared. Mental rotation and navigation tasks also appear in cognition questions, and the visuospatial sketchpad in Baddeley's working-memory model briefly holds spatial information.

Common confusion: Students swap the streams. Dorsal = parietal = where/how; ventral = temporal = what. Neglect is also not blindness: the eyes and primary visual cortex work, but attention to one side of space fails.