People and objects affect the quality of
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Legerstee, Maria ;Bowman, Thomas G. ;Fels, Sabina
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Article
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1992
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John Wiley and Sons
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## Abstract The vocalizations of eight infants with Down syndrome were recorded longitudinally in relation to different social and nonβsocial contexts. The infants were observed biweekly from 8 to 24 weeks and monthly up to 40 weeks. At each visit the infants were presented with their mother, a fem