Maternal sensitivity throughout infancy: continuity and relation to attachment security.

Relations among different measures of maternal sensitivity were assessed longitudinally by examining maternal behavior when infants were 4 months, 15 months, and 2.5 years. At each time period, two measures of maternal sensitivity were scored (4 months: maternal vocal and smiling contingency in face-to-face interactions; 15 months: maternal scaffolding and following of infants' play within joint attention; 2.

The role of joint attention in the development of infants' play with objects.

Year-old infants' play was scored within and outside joint attention with mother and when alone for four levels of maturity: stereotypical, inappropriate relational, appropriate relational, functional. Maternal sensitivity within joint attention was rated on two measures: following infants' interests and scaffolding infants' activities. Infants' play was more advanced with mother than when alone.