Individual difference in active perceived partner responsiveness (APR) predicting daily adaptation in two conditions. Pre-tested global partner perceived responsiveness, family income, and relationship type were controlled. Range of daily adaptation scale: [1, 7]. Condition × APR interaction: b=.35, p=. 010; simple slope: b=.49, p<.000 for Expressed Gratitude condition, b=.14, p=.029 for Active Control condition.