Second grade children were pretested for the ability to conserve, after which conservers were paired with nonconservers. Pairs were then instructed to resolve their opposing answers on the conservation tasks. (JMB)

Twenty-two mothers whose physiologic responses to infant signals had been recorded at an earlier date were videotaped with their infants during a feeding session when the infant was 9 months of age. Infants' development of the object concept was assessed at 15 months. (JMB)