Which binocular depth cue is defined by the brain's comparison of two slightly different images from each eye?

The correct answer is defined by retinal disparity, which is a key binocular depth cue. This phenomenon occurs because each eye perceives the world from a slightly different angle, creating two distinct images. The brain processes these two images, comparing and integrating them to gauge depth and distance. This comparison allows for a three-dimensional understanding of the environment, which is crucial for accurately perceiving the relative distances of objects.

Other options, while related to depth perception, do not accurately describe this specific mechanism. Binocular convergence, for instance, involves the inward movement of the eyes as they focus on a closer object, which helps determine distance but does not rely on image comparison. Depth perception encompasses various cues, including both binocular and monocular cues, but it is a broader term that doesn't specifically refer to the process involving image comparison. Monocular cues are depth cues that can be perceived with one eye and do not rely on the disparity between the two images produced by both eyes.