Table 1.

Timing of placement effects: Domains assessed in the Bucharest Early Intervention Project and and the age before which the intervention had its greatest impact, suggesting a sensitive period for that domain.

Domain assessed	Sensitive period “closes”
Stereotypes	12 months
Expressive language	15 months
Receptive language	15 months
Reading	24 months
Security of attachment	24 months
Organization of attachment	24 months
IQ at 54 months	24 months
ERN during flanker 8 years	20 months
Alpha and theta 8 years	24 months
Teacher-rated social skills 8 years	20 months
Cortisol response 12 years	24 months
RSA response 12 years	18 months
Competence 12 years	20 months