Nine-month-old Keisha watches her ball bounce down the stairs.As she approaches the top of the stairs,she backs up and hesitates to go down the stairs.This indicates that Keisha has developed ____.

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Keisha's hesitation to go down the stairs indicates that she has developed depth perception, which is the ability to perceive objects and surfaces in three dimensions and to judge distances accurately. This allows her to understand that the stairs are too steep for her and that she needs to be careful when going down them. Perceptual constancies refer to the ability to recognize that objects remain the same despite changes in size, shape, or orientation. Binocular vision is the ability to see using both eyes, which is typically developed by around 4 months of age. Proximity refers to the perception that objects that are close to each other tend to be grouped together.

Nine-Month-Old Keisha Watches Her Ball Bounce Down the Stairs