Knowing what kinds and intensities of stimuli the human sense organs can detect suggests what stimuli have been important for human survival; furthermore, the way the brain perceives those stimuli says something about their role. Most stimuli that are perceived positively are, in fact, good for people; food tastes and smells "good" because without some kind of psychological inducement to eat, people would not survive. Stimuli that are perceived negatively are those that people need to avoid; the fact that rotting foods smell "bad" is the brain's way of keeping one from eating something that might make one sick. To give an example from another sensory modality, most adults find the sound of a crying baby bothersome; in order to stop the sound, they address the needs of the infant. Cooing and laughing are rewards that reinforce good parenting.
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