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

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

• A. Motion.
• B. Color.
• C. Depth.
• D. Brightness only.

Answer: (A)

Magnocellular (M-type) ganglion cells are specialized for detecting motion and rapid changes in light over time. Their large receptive fields and high temporal resolution let them signal when something moves or when brightness flickers quickly across the visual field. They are largely achromatic, contributing little to color processing—that role belongs to the parvocellular pathway. While they do respond to changes in luminance, their primary strength is motion detection rather than static brightness alone. For these reasons, motion is the best answer.

Magnocellular (M-type) ganglion cells are specialized for detecting motion and rapid changes in light over time. Their large receptive fields and high temporal resolution let them signal when something moves or when brightness flickers quickly across the visual field. They are largely achromatic, contributing little to color processing—that role belongs to the parvocellular pathway. While they do respond to changes in luminance, their primary strength is motion detection rather than static brightness alone. For these reasons, motion is the best answer.