THE HYPOTHESIS GRADIENT. “The statistical character of the transient perturbation field means that doing so is not a simple matter of swarms of termites migrating “up the gradient” to the site of injury. Rather, there is a complex swarm decision-making process at work, where different groups of termites each generate a multiplicity of “hypotheses” for where the site of damage is. A “hypothesis” is “posed” when a termite is exposed to a transient perturbation of some threshold intensity, which prompts the termite to deposit a dollop of wet clay.”
https://link.springer.com/article/10.1007/s12304-016-9256-5