Study protocol. A) Assignment of participants. Distribution of the participants between groups (younger vs. older adults) and conditions (sham vs. real iTBS). B) Experimental design. Timeline of the procedures and scans acquired on the baseline day, the experimental day and the follow-up. C) The DMN, with an arrow pointing to the stimulation site over the lIPL. Abbreviations: YA, younger adults; OA, older adults; iTBS, intermittent theta-burst stimulation; rs-fMRI, resting-state functional magnetic resonance imaging; hr-3D, high-resolution three-dimensional; DTI, diffusion tensor imaging; mr-3D, medium-resolution three-dimensional.