Which statement about color fusion is true?

Which statement about color fusion is true?

• A. Is independent of the horopter
• B. Is the perception of luster
• C. Is a high-level form of fusion
• D. Is the lowest level of sensory fusion

Answer: (D)

Color fusion is the earliest stage at which information from the two eyes is combined to produce a single percept. This is a low-level, sensory integration process that occurs before higher-level interpretations like form, depth, or motion are fused. Because the two eyes share the same scene at corresponding retinal points, the brain merges their color signals early to give a unified color experience. It’s not independent of the horopter—fusion relies on retinal correspondence, which is defined by the horopter. It’s also not about luster, which concerns surface shine, nor is it a high-level form of fusion that integrates more complex percepts. So it sits at the lowest level of sensory fusion.

Color fusion is the earliest stage at which information from the two eyes is combined to produce a single percept. This is a low-level, sensory integration process that occurs before higher-level interpretations like form, depth, or motion are fused. Because the two eyes share the same scene at corresponding retinal points, the brain merges their color signals early to give a unified color experience. It’s not independent of the horopter—fusion relies on retinal correspondence, which is defined by the horopter. It’s also not about luster, which concerns surface shine, nor is it a high-level form of fusion that integrates more complex percepts. So it sits at the lowest level of sensory fusion.