Figure 1.

A) Overview of the elastography procedure. Hippocampal (HC) and orbitofrontal cortex (OFC) structures were automatically segmented from T₁-weighted images using FreeSurfer and converted into masks. Three-dimensional, full vector, complex displacement fields, with 1.6 mm isotropic voxels, were captured via MRE imaging acquisition for mechanical property estimation with nonlinear inversion. Soft prior regularization processes were applied to promote regional homogeneity during estimation and further reduce partial volume effects. The procedure returns tissue viscoelastic properties: shear stiffness, μ, and damping ratio, ξ. B) Illustration of the spatial reconstruction task (SR). On each trial participants studied a display that included six objects. After a short delay, participants used the mouse to reconstruct the display that they had just studied. This provides a measure of relational memory. C) Depiction of the figure series task (FS). On each trial participants were presented with a series of figures with one missing piece. Participants had to identify that missing piece from several presented options. This provides a measure of fluid intelligence.