There was a significant main effect for latency related to Age Group, F(2, 85) = 3.31, p = .04, ηp2 = .07, 1-β = .61.We tested our developmental hypothesis that age would be associated with a decrease in latency, within a linear contrast. Because Condition did not interact with Age Group, we tested the age effect collapsed across conditions. This test indicated a significant linear effect for reduction in ERP latency from 10–12 yrs. to 15–17 years, F(1, 88) = 4.60, p < .05, η2 = .05, the quadratic contrast was not significant, F(1, 88) = .42, p = .52. Pairwise comparison indicated that 10–12-year-olds, had a longer latency than 15–17-year-olds, mean difference = 17.35, SE = 6.80, p = .04. The 13–14-year-olds did not differ with the 15–17-year-olds or the 10–12-yearolds. Neither the interaction of Condition × Sex, F(1,85) = 4.05, ns, nor the Condition × Age Group interaction was significant, F(2,85) = .26, ns.
