One cultural factor influencing infant development is how infants are carried from place to place. Ask four mothers whose infants were born in each of the past four decades how they transported them—
Observe synchrony for three minutes. Ideally, ask the parent of an infant under 8 months of age to play with the infant. If no infant is available, observe a pair of lovers as they converse. Note the sequence and timing of every facial expression, sound, and gesture of both partners.
Telephone several day-