A neural implementation of cognitive reserve: insights from a longitudinal fMRI study of set-switching in aging

The dataset (Data.mat) comprises variables extracted from demographic information, cognitive task performance, and MRI/fMRI imaging of a longitudinal study of 52 adults aged 60–71, evaluated at baseline and after a 5-year follow-up. The analysis code is structured into two main codes: (A) Main Analysis in MATLAB (Code1_MainAnalysis_Matlab.m), which utilizes the primary dataset (Data.mat) to examine brain variables, model cognitive trajectories, and prepare data for further interaction analysis. (B) Interaction Visualization in R (Code2_Johnson-Neyman_R.R), which produces interaction effect visualizations using the output from MATLAB analysis.