What type of stimulus do P-type ganglion cells respond to?

What type of stimulus do P-type ganglion cells respond to?

• A. Color.
• B. Motion.
• C. Sound.
• D. Brightness and motion.

Answer: (A)

P-type ganglion cells are part of the parvocellular pathway and are specialized for color processing with high spatial resolution. They receive input from cones and generate color-opponent signals (red-green, blue-yellow), which underlie detailed chromatic vision. Their responses are relatively sustained and precise in space, not optimized for rapid changes, so they don’t carry the primary motion information. By contrast, motion and luminance are carried mainly by the magnocellular pathway. Sound isn’t visual at all. So the stimulus type these cells respond to is color.

P-type ganglion cells are part of the parvocellular pathway and are specialized for color processing with high spatial resolution. They receive input from cones and generate color-opponent signals (red-green, blue-yellow), which underlie detailed chromatic vision. Their responses are relatively sustained and precise in space, not optimized for rapid changes, so they don’t carry the primary motion information. By contrast, motion and luminance are carried mainly by the magnocellular pathway. Sound isn’t visual at all. So the stimulus type these cells respond to is color.