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Lipton, Jennifer S.; Spelke, Elizabeth S. – Infancy, 2004
Six experiments investigated infants' sensitivity to numerosity in auditory sequences. In prior studies (Lipton & Spelke, 2003), 6-month-old infants discriminated sequences of 8 versus 16 but not 8 versus 12 sounds, and 9-month-old infants discriminated 8 versus 12 but not 8 versus 10 sounds, when the continuous variables of rate, sound duration,…
Descriptors: Experimental Psychology, Numbers, Auditory Stimuli, Age Differences
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Shaddy, D. Jill; Colombo, John – Infancy, 2004
This study examined 4- and 6-month-olds' responses to static or dynamic stimuli using behavioral and heart-rate-defined measures of attention. Infants looked longest to dynamic stimuli with an audio track and least to a static stimulus that was mute. Overall, look duration declined with age to the different stimuli. The amount of time spent in…
Descriptors: Visual Stimuli, Attention, Infants, Age Differences