MAPT and dementia: Among visually tau-positive participants with MCI or Alzheimer’s disease dementia, higher TAU-SPEX was associated with lower cross-sectional MMSE scores (standardized β=−0.36 [−0.30, −0.43], p < 0.001) and steeper rates of MMSE decline (β=−0.19 [−0.15, −0.22], p < 0.001).