Cubic associations between age and task activations.

a Cubic association with age, adjusted for GMP; b cubic association with age, adjusted for GMP with task positive mask; c cubic association with age adjusted for GMP with task negative mask; d cubic association with age adjusted for education and GMP; e cubic association with age adjusted for education, accuracy and GMP; f cubic association with age adjusted for a cubic education level, accuracy and GMP. GMP = grey matter probability, red = increased activation with increasing age, blue = decrease in activation with increasing age. Voxel p < .001, cluster p < .05(FWE-corrected).