Exploring some edges: Chunk-and-Pass processing at the very beginning, across representations, and on to action.

We identify three "working edges" for fruitful elaboration of the Chunk-and-Pass proposal: (a) accounting for the earliest phases of language acquisition, (b) explaining diversity in the stability and plasticity of different representational types, and

Relative influence of genetics and shared environment on child mental health symptoms depends on comorbidity.

Background: Comorbidity among childhood mental health symptoms is common in clinical and community samples and should be accounted for when investigating etiology. We therefore aimed to uncover latent classes of mental health symptoms in middle childhood in a community sample, and to determine the latent genetic and environmental influences on those classes.

Methods: The sample comprised representative cohorts of twins.