A traumatic brain injury or toxic exposure can also result in symptoms of depression
Compulsive disorders are typically associated with over-firing in your brain due
to a deficit in the neurotransmitter serotonin.
You can boost your serotonin levels naturally, using 5-HTP, L-tryptophan, St. John’s Wort, saffron, and exercise
Impulsive disorders are typically associated with low activity in the prefrontal cortex, indicating you have trouble inhibiting your behavior.