Upon discovering that he can no longer control an interesting visual display, a 5-month-old becomes highly agitated but shows little physiological evidence of stress. This infant is likely experiencing

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Anger is a common response in infants when they are unable to control a situation or object that interests them, even if they do not show significant physiological signs of stress. This reaction is due to frustration or blocked goals, rather than fear, sadness, or disgust.

Upon Discovering That He Can No Longer Control an Interesting