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Usage:

...will and nurse.") So evolution has provided a defensive weapon for the offspring: psychological warfare. Some fledgling birds will scream with hunger?even when they are reasonably well fed?to induce the parent to bring more food. Dogs withhold tail-wagging to get more food. Children withhold or provide smiles???as a means of reinforcing maternal behavior they need. Says Trivers: "Strong selection pressures tend to favor the infant's efforts to express its own self-interest. Once you explore the stratagems of parent and child, I think you can see that the child is not just an empty vessel...

Author: /time Magazine | Title: Why You Do What You Do | 8/1/1977 | See Source »

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