Neurochemistry

There are a few molecules which float in your brain which do specific things:

• Dopamine is a monoamine neurotransmitter. It plays a key role in the functioning of the limbic system, which is involved in emotional function and control. It also is involved in cognitive processes associated with movement, arousal, executive function, body temperature regulation, and pleasure and reward, and other processes.
• GABA is an example of an inhibitory neurotransmitter.
• Norepinephrine, also known as noradrenaline, is a monoamine neurotransmitter that is involved in arousal, pain perception, executive function, body temperature regulation, and other processes.
• Epinephrine, also known as adrenaline, is a monoamine neurotransmitter that plays in fight-or-flight response, increases blood flow to muscles, output of the heart, pupil dilation, and glucose.
• Serotonin is a monoamine neurotransmitter that plays a regulatory role in mood, sleep, appetite, body temperature regulation, and other processes.
• Histamine is a monoamine neurotransmitter that is involved in arousal, pain, body temperature regulation, and appetite.

Dopamine

Dopamine works as a reward chemical. When your dog sees the ball you are about to throw it sets a dopamine dynamic where it craves the neurochemical dopamine but the release of which only occurs in the wanting stage. When the dog actually gets the ball, the having stage dopamine disappears.