Gitit Kavé, Moran Shalmon and Ariel Knafo Environmental contributions to preschoolers' semantic fluency Developmental Science 16
Semantic fluency was examined in Hebrew speaking 5-year-old monozygotic and dizygotic twins (N = 396, 198 pairs), 22% of them with mother-reported speech-related problems. There were positive correlations of similar magnitudes among monozygotic, same-sex dizygotic, and opposite-sex dizygotic twins. Analyses showed no genetic effects, alongside significant shared (39%) and non-shared environmental (61%) effects on fluency scores.
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