When they get active, they need increased blood flow to supply that activity, and lucky for us, blood flow control to the brain is local, so if a bunch of neurons, say, right there get active and start firing, then blood flow increases just right there.
Kada se aktiviraju, trebaju povećan dotok krvi za opskrbu, srećom za nas, kontrola dotoka  krvi u mozak je lokalna, te kada se skup neurona, recimo ovdje, aktivira i počnu odašiljati, tada se dotok krvi poveća  baš na tom mjestu.