A dyadic investigation of exercise support between cardiac patients and their spouses.

The authors examined married partners' similarity in reported exercise behavior as a moderator of the association between social support for exercise provided and received by extending an actor-partner dyadic effects model. Participants were married cardiac rehabilitation patients and their spouses (N=99 couples). For couples similar in their reported exercise behavior, a significant association was found between both partners' independent reports of providing exercise support to and receiving exercise support from one another (n=49 couples). However, for couples differing in their reported exercise behavior (n=50 couples), no association was found between either partner's provision and receipt of support for exercise. Findings have the potential to inform practitioners of patients who may not be receiving adequate social support for their recommended exercise. Future interventions may consider implementing dyadic educational or motivational strategies with patients and their spouses.     

The learning of goal-directed locomotion: A perception-action perspective

This study was designed to better understand the process underlying the learning of goal-directed locomotion. Subjects walked on a treadmill in a virtual reality setting and were asked to cross pairs of oscillating doors. The subjects' behaviour was examined at the beginning of the learning process (pretest), after 350 trials (intermediate test), and after 700 trials (posttest). The data were analysed at three different levels, each representing a specific aspect of the global response: performance outcome, displacement kinematics, and current arrival condition. While some aspects of performance outcome suggested the presence of a ceiling effect in the intermediate test, both displacement kinematics and current arrival condition clearly highlighted continuous transformations of the control mechanism involved. The learning process is best described as (1) the establishing of a relationship between specific information and a movement parameter and (2) the optimization of this relationship. The optimization process is characterized by the further exploration of the available behavioural repertoire and by the refinement of the dialogue between information and movement.     

A Social Interpolation Model of Group Problem-Solving

How do people use information from others to solve complex problems? Prior work has addressed this question by placing people in social learning situations where the problems they were asked to solve required varying degrees of exploration. This past work uncovered important interactions between groups' connectivity and the problem's complexity: the advantage of less connected networks over more connected networks increased as exploration was increasingly required for optimally solving the problem at hand. We propose the Social Interpolation Model (SIM), an agent-based model to explore the cognitive mechanisms that can underlie exploratory behavior in groups. Through results from simulation experiments, we conclude that “exploration” may not be a single cognitive property, but rather the emergent result of three distinct behavioral and cognitive mechanisms, namely, (a) breadth of generalization, (b) quality of prior expectation, and (c) relative valuation of self-obtained information. We formalize these mechanisms in the SIM, and explore their effects on group dynamics and success at solving different kinds of problems. Our main finding is that broad generalization and high quality of prior expectation facilitate successful search in environments where exploration is important, and hinder successful search in environments where exploitation alone is sufficient.