Cross-correlation and most other longitudinal analyses assume that the association between 2 variables is stationary. Thus, a sample of occasions of measurement is expected to be representative of the association between variables regardless of the time of onset or number of occasions in the sample. The authors propose a method to analyze the association between 2 variables when the assumption of stationarity may not be warranted. The method results in estimates of both the strength of peak association and the time lag when the peak association occurred for a range of starting values of elapsed time from the beginning of an experiment.

Mirror symmetry between individuals is a behavioral phenomenon that is commonly observed in conversation: individuals tend to mimic each other's postures and gestures as a part of a shared dialog. The present work studies the process of symmetry building and symmetry breaking in the movements of pairs of individuals while imitating each others' movements in dance. Spatial and temporal symmetries are found in the overall velocities from the results of full body motion tracking.

Having negative views of oneself or a relationship partner is associated with low general or relationship well-being. This study examines the moderating effects of individuals' implicit personality theories-beliefs that people's attributes are either malleable or fixed. We predicted that individuals' beliefs about the malleability of attributes would moderate the relationship between views of the partner and relationship well-being and also the relationship between self-views and general well-being. These predictions were supported. When individuals had strong beliefs that people can change, the relationship between individuals' views of their partners and their relationship well-being was weaker; when individuals had strong beliefs that attributes are unchangeable, the relationship between views of partner and relationship well-being was stronger. The same moderating effect was found for self-ratings; individuals' self-ratings were less closely linked with general well-being when individuals believed that attributes are malleable.

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