To assess developmental changes in the importance of stimulus intensity and pattern detail for infants' visual attention, infants of 10, 17, and 25 wk. of age were shown pairs of stimuli equated for stimulus intensity but different in pattern detail (angles or straight lines). The youngest infants gave equivalent amounts of attention to the stimuli of each pair while the two older groups showed a significant preference for the angular stimuli. The results are interpreted as showing the increased attention to elements with development, and a possible explanation of the preference for the angle stimuli is discussed.
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