Which pairing correctly matches the pathway to its primary function?

• A. Dorsal: object recognition; Ventral: spatial localization
• B. Dorsal: color perception; Ventral: motion detection
• C. Dorsal: spatial localization; Ventral: object identity
• D. Dorsal: sound processing; Ventral: memory

Answer: (C)

The main idea tested is the division of visual processing into two pathways: a dorsal stream that handles where objects are and how to interact with them, and a ventral stream that handles identifying what the objects are. The pairing that matches this is dorsal with spatial localization and ventral with object identity. The dorsal pathway routes information to parietal regions and supports locating objects in space and guiding actions, like reaching or grasping. The ventral pathway routes to temporal regions and supports recognizing and identifying objects, including aspects like shape and color.

Why the other pairings don’t fit: color perception and motion detection are not both handled by the dorsal and ventral streams in the way those options suggest—color perception is primarily a ventral process, while motion detection is a hallmark of the dorsal stream. Sound processing and memory involve other brain systems and aren’t the primary functions attributed to these visual streams.