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Serotonin
A neurotransmitter involved in many functions including mood regulation, digestion, and sleep.
Dopamine
A neurotransmitter in the brain that plays a key role in regulating mood, sleep, learning, and movement, often associated with the pleasure and reward system.
Norepinephrine
A neurotransmitter involved in the body's response to stress and regulation of mood, attention, and arousal.
Evolutionary View
A perspective in psychology (and other sciences) that seeks to explain traits, behaviors, and mental processes as adaptations that have evolved to solve recurrent problems faced by ancestral humans.
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