Dopamine doesn’t flood the brain as once believed – it fires in exact, ultra-fast bursts that target specific neurons.

Thank you. Almost every word of the sentence above is very much not what college freshmen have been taught for 30+ years. Dopamine was never thought to "flood the brain." For a few decades it's been understood to have highly targeted action, restricted by various factors not least of which is the fact that dopamine is only produced in/near certain synapses.

Straw men are sometimes the most annoying men.