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Cortex folding during brain development (Evolution steps) for four different thicknesses (A/B) of the cortex

mu(s) is the shear modulus of the cortex
mu(c) is the shear modulus of the core
A/B = outer/inner radius of cortex
Evolution steps = increasing gt, in which
gt = sqrt(deformed/undeformed) cortex outer surface area
gs, gc = growth rates of cortex, core

From the same paper as the previous slide.

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