FIG. 5.

The outcome measures observed in the plane-stress and plane-strain analysis of the two-dimensional hyperelastic models. (A) The variation in outcome measures of principal strain observed in the grey and the white matter resulting from variations in grey and white matter material tangent moduli for each of the plane-stress (PS) and plane-strain (PE) assumptions. (B) The variation in outcome measures of principal stress and pressure observed in the grey and the white matter showed plane-strain (PE) analyses to predict greater variability than plane-stress (PS) analyses. 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 the white matter properties and indicates sensitivity to relative material properties. Nonlinear terms include all additional material interaction terms and nonlinear material property variables.