“…In a longitudinal study of 1- to 9-year-old high-risk offspring (n=117) and low-risk peers (n=95), the groups displayed similar developmental trajectories of negative affect across the years, but high-risk offspring had consistently lower levels of positive affect than controls (Olino, Lopez-Duran et al, 2011). This finding complements results from cross-sectional studies, which showed lower levels of positive affect among high-risk offspring than among controls in experimental situations, including in samples of: 1- to 8-year-olds (Shaw et al, 2006), 3- to 4-year-olds (Durbin, Klein, Hayden, Buckley, & Moerk, 2005), 9- to 14-year-olds (McMakin, Burkhouse et al, 2011), and 8- to 17-year-olds (Dietz et al, 2008). Importantly, (compared to affect in low-risk offspring), attenuated positive affect persisted across different laboratory contexts according to high-risk 9- to 14-year-olds and their mothers (McMakin, Burkhouse et al, 2011).…”