The normalized planum temporale AI for each pre-reader (top panel) and adolescent (bottom panel). Positive scores indicate a rightward planum temporale lateralization (right > left) and negative scores indicate a leftward lateralization (left > right). Within each group (blue = FRD⁻, red = FRD⁺) participants are ranked from low to high AI. In the right panel, mean lateralization is presented for each group.