Final answer:
Mathematical binocular summation levels can increase with disparity, meaning that when there is a difference between the images received by each eye, the brain can better integrate the information from both eyes to enhance perception.
Step-by-step explanation:
Binocular summation refers to the phenomenon where the combined action of both eyes improves visual perception. In the context of mathematical binocular summation, the levels can increase with disparity. This means that when there is a difference or discrepancy between the images received by each eye, the brain can better integrate the information from both eyes to enhance perception. Disparity refers to the difference in the location of the corresponding points in the two retinas.