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Kin selection theory predicts that cooperative acts should occur more often between individuals sharing a higher proportion of genes than those sharing fewer. This expectation is supported, in part, by the greater social closeness of monozygotic (MZ) twins than dizygotic (DZ) twins. Previous research in 2008, using young twins, suggested that the synchronized MZ twin relationship may partly reflect non-negotiated consensus, occurring as a function of the twins’ shared behavioral similarities. The present study sought to determine if tacit coordination also varies with genetic relatedness in older twins. The sample included 43 MZ twin pairs and 34 DZ twin pairs, ages 12–59 years, who completed a Tacit Coordination Questionnaire under Individual and Coordination conditions. Significant Zygosity and Condition effects were found, with MZ twins outscoring DZ twins, and Coordination matches exceeding Individual matches. Logistic regression analysis identified specific classes of items that discriminated between twin types better than others. The present findings are compared with those from the 2008 study, refining theories concerning genetic contributions to coordination and partner success. |
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