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might be required to give up their own
object versus an object that's just
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object versus an object that's just
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object versus an object that's just
sitting there in the lab right
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sitting there in the lab right
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sitting there in the lab right
presumably their own object has higher
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presumably their own object has higher
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presumably their own object has higher
personal cost now we don't really know
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personal cost now we don't really know
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personal cost now we don't really know
one personal cost start to impact
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one personal cost start to impact
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one personal cost start to impact
infants pro-social behavior because
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infants pro-social behavior because
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infants pro-social behavior because
there's been a lot of mixed evidence and
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there's been a lot of mixed evidence and
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there's been a lot of mixed evidence and
particularly in infancy there's as of
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particularly in infancy there's as of
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particularly in infancy there's as of
yet no systematic evidence that high
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yet no systematic evidence that high
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yet no systematic evidence that high
personal costs actually reduce infants
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personal costs actually reduce infants
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personal costs actually reduce infants
pro-social responding what about the
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pro-social responding what about the
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pro-social responding what about the
question of energetic physical effort
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question of energetic physical effort
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question of energetic physical effort