Fig. 2: Schematic AE bivariate twin model for face orienting and face preference.
From: Infants’ looking preferences for social versus non-social objects reflect genetic variation

Twin structural equation model-fitting was used to decompose the variance in face orienting and face preference into genetic (A) and unique environment (E) influences. Point estimates are shown with 95% CIs in brackets. The dotted line represents the shared genetic influences (significant), whereas the dashed line represents the unique genetic influences (non-significant).