FIG. 2.

The outcome measures observed in the grey and white matter for the hyperelastic material models. (A) The average variation in the strain outcome measures in the white matter and grey matter resulting from simultaneous variation of all the tangent stiffness properties in the hyperelastic models. (B) The average variation in stress and pressure outcomes, measured in the white and grey matter, resulting from simultaneous variation of all the tangent stiffness properties in the hyperelastic models. The percent variability in each outcome measure to changes in each individual material modulus is reflected by the plot colors. Grey/white interaction is the cross of the grey and white material properties, and indicates sensitivity to relative material properties. Nonlinear terms include all additional material interaction terms and nonlinear material property variables.