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Recent research in adults has determined that affective pictures modulate beta oscillations within 300ms.However,it is unclear whether selectively distributed beta oscillations reflect developmental changes in processing affective information during adolescence.Here we collected event-related beta oscillations from 51 adolescents and 18 undergraduates when they viewed 90 pictures from the Chinese affective picture system.Results indicated that affective pictures elicited increased beta responses relative to neutral pictures.Beta responses upon positive and negative versus neutral pictures decreased with age at the fronto-central regions while no difference was observed between late adolescents and younger adults.Early and late adolescents exhibited dissociable beta response patterns in hemisphere processing of positive and negative pictures.These results suggested that adolescents exhibited affective modulation of beta oscillations similar to adults and undergo age-dependent changes in the oscillatory brain reorganization.