Which of the following is NOT one of the four types of sensory fusion?

• A. Color fusion
• B. Simultaneous perception
• C. Monocular rivalry
• D. Stereopsis

Answer: (C)

Sensory fusion is about the brain merging information from both eyes into a single percept. Color fusion is when different colors from each eye are combined into one perceived color, forming a unified chromatic impression. Simultaneous perception describes seeing the combined scene from both eyes as one coherent image rather than two separate views. Stereopsis is the depth percept that arises when the brain fuses binocular disparity to create a three-dimensional sense of space. Monocular rivalry, on the other hand, occurs when each eye is presented with a different image and the percept alternates between them rather than merging into one. Because there’s no single fused percept in rivalry, it’s not a type of sensory fusion.