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Table 1. 

Properties of Sounds Used in the Experiment

Sound
Communicative
Vocal
Infant-directed speech √ √ 
Adult-directed speech √ √ 
Communicative vocal nonspeech √ √ 
Noncommunicative vocal nonspeech √ 
Rhesus macaque calls 
Clapping 
Walking 
Water 
Sound
Communicative
Vocal
Infant-directed speech √ √ 
Adult-directed speech √ √ 
Communicative vocal nonspeech √ √ 
Noncommunicative vocal nonspeech √ 
Rhesus macaque calls 
Clapping 
Walking 
Water 
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