From Creatures Wikia
The Decision lobe has a size of 13 neurons.
This lobe receives input signals from the the Concept lobe and the Verb lobe. The different inputs of one neuron are summed up and the neuron with the highest activity is selected to actually specify the "decision" of the creature. In Creatures 1 and Creatures 2 this behavior is achieved by the "Winner takes all (WTA)" flag in this Lobe's gene. In Creatures 3 this is done by special SVRules.
Possible meanings include: