COMPETING GRADIENTS. “Mound repair, therefore, is a race between numerous initiation sites to be the one that transitions to self-sustaining σ-building first. In the damaged mound, this is usually assured by a small bias toward more intense τ-building near the site of damage. This produces a denser concentration of initiation sites there, making the progress to spongy build slightly faster there.”
https://link.springer.com/article/10.1007/s12304-016-9256-5