Five experiments with 12-, 15-, and 18-month-olds examined 276 infants' ability to learn from television under semi-naturalistic conditions. Findings indicated that infants of all ages imitated live-modeled actions. There were age- and task-related differences in infants' ability to imitate the same television-modeled actions. Findings highlighted the role of perceptual, attentional, and cognitive development in ability to learn from television. (Author)