1. The Amydgala
The Amygdala is an almond-shaped set of neurons located deep within the brain's medial temporal lobe. It plays a key role in processing emotions, and is linked to both fear and pleasure in humans and other animals. The amygdala is also correlated with aggressive behavior over a number of species. Conditions such as anxiety, autism, PTSD, depression, and phobias are thought to be associated with abnormal functioning of the amygdala.

2. The Hypothalamus
The hypothalamus is a region of the brain located below the thalamus. It's main function is to regulate the endocrine system through the pituitary gland, but it also controls basic human drives like hunger and thirst, and circadian cycles. In terms of behavior, the hypothalamus controls mood, anger, and libido.

3. The Anteriro Cingulate Cortex
The Anterior Cingulate Cortex is a collar-shaped area of the brain which encompasses the frontal part of the corpus callosum. Other than playing a role in autonomic functions such as blood pressure and heart rate, it also is known as the "hub" of behavior in the brain, and is associated with decision-making, empathy, the reward system, impulse control, and emotion.

4. The Nucleus Accumbens
The Nucleus Accumbens is a tiny but important region of the brain that controls the reward system. Many hormone circuits meet here, including dopamine, serotonin, and oxytocin. Other than the reward system, the Accumbens is related to laughter, aggression, fear, addiction, and impulsivity.

5. Orbitofrontal Cortex (OFC)
The orbitofrontal cortex is one of the least well-understood areas of the brain. What we do know is that the area is involved in sensory integration, decision-making, and expectation. The OFC seems to be involved in comparing the expected outcome to the actual outcome, making it critical for adaptive learning. Research has proved that the area is seriously afflicted during OCD, and neural loops are thrown off course.

6. Prefrontal Cortex
The Prefrontal Cortex is located in the front area of the brain, and is where our emotional control, judgment, and insight comes from. It also allows us to make plans and control impulses. A person who is thoughtful, empathetic, and conscientious should have a highly functioning prefrontal cortex.

7. Basal Ganglia
And finally, the basal ganglia. This area contains specialized neurons that surround the limbic system, and coordinates our movements with emotions and stimuli. The basal ganglia contain a neural network that facilitates our feelings of pleasure, ecstasy, anxiety, and tension. High activity in this area might stimulate addiction, anxiety, and panic, while low activity might cause lethargy and an unwillingness to start or complete tasks.