Age differences in the impact of peers on adolescents' and adults' neural response to reward.

While we had also expected that adolescents’ response to receipt of reward would be greater during the Peer condition than during the Alone condition, this expectation was only partially borne out – the within-group test for adolescents did not reach statistical significance despite a fairly substantial increase in VS engagement in the Peer condition and despite fairly large and consistent effect sizes in the bilateral NAcc (right, d = 0.73; left, d = 0.83), suggesting that the lack of statistical significance may have been due to limited power.

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