The logical levels of complementary, symmetrical, and parallel interaction classes in family dyads

It was postulated that the parallel interaction class is a higher logical order than complementary and symmetrical interaction, which appear to be of the same logical type. Father-mother, father-child, and mother-child dyads of 48 families were categorized into complementary, symmetrical, and parallel classes using the Relationship Styles Inventory. Each of the dyads in these three categories was then randomly assigned to one of two experimental conditions in which they jointly resolved a moral dilemma. In one condition, the dyads were asked to follow complementary rules, while in the second condition they were instructed to follow symmetrical rules. Results indicated that parallel dyads adjusted to both the complementary and symmetrical conditions, whereas symmetrical and complementary dyads did not successfully accomodate rules outside their own class. The implications in terms of therapeutic intervention and further research are discussed.