Final answer:
Retinal disparity, a binocular cue for depth perception, is related to the different images each retina receives due to the eyes' separation, which the brain uses to gauge depth. Convergence is the inward turning of the eyes to focus on an object, providing the brain with distance information. Both cues are essential for experiencing the world in three dimensions.
Step-by-step explanation:
The difference between retinal disparity and convergence in psychology relates to how our brains perceive depth. Retinal disparity is a binocular cue for depth perception and refers to the slight difference in the images projected on each retina due to the horizontal separation (interocular distance) of our eyes. Because of this separation, objects at different distances will fall on different spots on each retina, allowing the brain to gauge the depth.
Convergence, on the other hand, is another binocular cue involving the degree to which the eyes turn inwards to focus on an object. As an object comes closer, our eyes converge more, and the muscle sensations associated with this movement provide the brain with information on the object's distance.
Together, retinal disparity and convergence allow us to experience the world in three dimensions and to perceive both stationary and moving objects in terms of depth.