Age-related changes in gray matter volume predict left MFG activation. A Age-related changes in left STS/STG (−64, −10, and −4) and left HC (−18, 0, and −16) regions that were responsive to increasing speech intelligibility and predicted left MFG activation during word recognition, after controlling for brain volume. The left SMG/PCS (−42, −40, and 54; not shown) was not significantly predictive of left MFG activation after controlling for brain volume. B Gray matter volume in the left STS/STG (red diamonds) and left HC (yellow squares) predict left MFG activation from the correct–incorrect comparison (shown on the y-axis).