Fluency neural networks in aging and ASD. Group independent components analyses associated for word generation produced common and unique networks. All groups produced a network including left inferior frontal gyrus. Some but not all groups showed a network involving the SSA and subcortical structures, the Default Mode Network, and bilateral cerebellar network. a: young NT, b:young ASD, c: middle-aged NT, d: middle-aged ASD. LIFG: left inferior frontal gyrus; SSA: supplemental speech area.