When a 2-day-old infant consistently shows a visual preference for a bull's-eye pattern over a checkerboard pattern, we know that the infant:

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The infant's consistent visual preference indicates that they are able to perceive and differentiate between the two patterns. This does not necessarily indicate that their vision is fully developed, but it does suggest a basic ability to distinguish visual stimuli.

When a 2-Day-Old Infant Consistently Shows a Visual Preference for a Bull's-Eye