Where does the problem occur? It is in the neuroanatomy of the brain & Central Nervous System (CNS).
Crash Course Psychology #3 - The Chemical Mind 
BAHHHHHH! Did I scare you? What exactly happens when we get scared? How does our brain make our body react? Just what are Neurotransmitters? In this episode of Crash Course Psychology, Hank takes us to the simplest part of the complex system of our brains and nervous systems; The Neuron.
Questions for CC Psych #3 - The CHEMICAL MIND

Crash Course Psychology #4 - The Brain 
In this episode of Crash Course Psychology, we get to meet the brain. Hank talks us through the Central Nervous System, the ancestral structures of the brain, the limbic system, and new structures of the brain. Plus, what does Phineas Gage have to do with all of this? 

RSA Animated: The Divided Brain