The following variables were rated on
a 7-point scale ranging from 1 (no instances) to 7
(constant, throughout interaction): (a) child’s respon-
siveness to parent assessed the extent to which the
child responded immediately and contingently to
the parent’s comments, questions, or behaviors; (b)
parent’s responsiveness to child assessed the extent to
which the parent responded immediately and con-
tingently to the child’s comments, questions, or
behaviors; (c) dyadic reciprocity assessed the degree
to which the dyad showed shared positive affect,
eye contact, and a “turn-taking” (conversation like)
quality of interaction; and (d) dyadic cooperation
assessed the degree of agreement about whether
and how to proceed with the task. The interrater
reliabilities (intraclass correlation coefficients) were
as follows: .65 for child responsiveness, .52 for par-
ent responsiveness, .83 for dyadic reciprocity, and
.75 for dyadic cooperation.