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From Simple Signals to Complex Emotions
C. elegans, a nematode, has a straightforward neural mechanism that connects sensory experiences directly to motor responses based on basic good or bad evaluations, influenced by hunger. This contrasts with the complexity of human brains, where emotional responses are mediated through intricate interactions involving multiple brain areas. In humans, neuromodulators like dopamine, associated with pursuit and seeking, and serotonin, linked to satiation and relaxation, play significant roles in emotional regulation. Investigating these basic neural responses in nematodes can provide insights into the evolutionary origins of these neuromodulators and the fundamental nature of emotion.