 have no sense of individual self, as all  strogg are controlled by the Nexus (via the neurocyte implant). This  effect is supposed to kick in quickly after being activated as a  strogg soldier (said Hannibal medic:"...higher brain functions seem  to have completely atrophied..."). The process also erases ones  personality, the individual is no longer aware of his situation in  any way other than intended by the Nexus. However, we see and hear  the tactical units talk, and see them making tactical decisions and  signaling each other 