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14 Tom Lewis, Developmental Psychology Today, 1971 (Stimuli required to elicit smiling response in infants of various ages; after Ahrens) | by 50 Watts
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14 Tom Lewis, Developmental Psychology Today, 1971 (Stimuli required to elicit smiling response in infants of various ages; after Ahrens)

see the series on my blog 50 Watts

 

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Taken on January 18, 2011