Fig. 4.

Mean changes in oxygenated (HbO) and deoxygenated (HbR) hemoglobin for each channel as a function of age group, control demands, and social context. Error bars indicate standard errors. ‘cd’= channels in which HbO significantly increased with cognitive control demands. ‘sc’ = channels in which HbO significantly varied across social contexts. HbO increased with cognitive control demands, mostly over the left PFC channels and in older children. HbO was lower in the competitive context in two right PFC channels and in the cooperative contexts in two left PFC channels.