Because there is no conscious force guiding it

new fear unlocked

Also based on the picture it was in the right pre frontal cortex. Interesting because most people won't have much in terms of neurologic symptoms with a lesion here, outside of some subtle mood and executive dysfunction issues maybe. You won't get like language problems, weakness, numbness, vision loss etc or more obvious symptoms like you would with brain damage other places. Worm found a stealthy spot in the brain to hide in.