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Unformatted text preview: but especially interested in people and faces. Relatively indiscriminate at first but more so over time. Smile more when reinforced by mother special smile for mother (Duchenne Smile) not all babies smile with equal frequency; individual, cultural, and sex differences exist wide array of stimuli can make baby laugh (and what makes children laugh changes as they develop) 18 th month old social smiling occurs more frequent toward humans than nonhuman objects end of 2 nd year: o use smiling purposefully o show sensitivity to emotional expressions of others 3-5 year olds: o laughing becomes social event, which occurs in presence of other 95% of the time...
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- Fall '08
- Developmental Psychology