How many visual processing streams originate from the primary visual cortex?

How many visual processing streams originate from the primary visual cortex?

• A. One stream.
• B. Two streams.
• C. Three streams.
• D. Four streams.

Answer: (B)

Two parallel pathways originate from the primary visual cortex. After initial processing in V1, visual information splits into a dorsal stream that analyzes where things are and how they move, guiding spatial awareness and actions, and a ventral stream that analyzes what things are—identifying objects, colors, and fine details. The dorsal pathway mainly reaches the parietal region, while the ventral pathway goes toward the temporal region. This dual-stream organization lets the brain simultaneously track location and object identity, supporting both perception and visually guided behavior. Choosing more or fewer streams isn’t supported by the classic model, which centers on these two major pathways.

Two parallel pathways originate from the primary visual cortex. After initial processing in V1, visual information splits into a dorsal stream that analyzes where things are and how they move, guiding spatial awareness and actions, and a ventral stream that analyzes what things are—identifying objects, colors, and fine details. The dorsal pathway mainly reaches the parietal region, while the ventral pathway goes toward the temporal region. This dual-stream organization lets the brain simultaneously track location and object identity, supporting both perception and visually guided behavior. Choosing more or fewer streams isn’t supported by the classic model, which centers on these two major pathways.