Astatistical method of analyzing the intercorrelations among various measures or test score; clusters of measures or test scores that are highly correlated are assumed to measure the same underlying trait or ability.

a. factor analysis
b. factor traits
c. cluster traits

Interactional synchrony is like an "emotional dance" between caregiver and child, wherein they send important signals and share emotions. what does this process form for the child? a. a physical foundation for trust b. a basis of the drive for independence c. positive experiences that stabilize brain connections d. a basis for attachment