Which system is more effective for detecting fast-moving stimuli?

The photopic system is more effective for detecting fast-moving stimuli because it operates primarily in well-lit conditions and is responsible for high acuity vision. This system utilizes cone photoreceptors, which are concentrated in the fovea, the central part of the retina. Cones provide the ability to perceive fine detail and color, making them highly effective in discerning rapid changes in visual stimuli.

When light levels are sufficient, the photopic system achieves better temporal resolution, which is crucial for tracking fast movements. This is due to the faster response times of cone cells compared to rod cells, which dominate the scotopic system which operates in low-light conditions. Rods are more sensitive to light but are less capable of providing detailed information about rapidly changing visual environments. Therefore, when detecting fast-moving stimuli in good lighting conditions, the photopic system is the preferred mechanism.