People repeat behaviour that leads to flooding their brains with pleasurable chemicals. The short-term reward loop acts over hours to years, and the long-term reproductive success loop over generations.

Summary

This quote suggests that people engage in behaviors that result in the release of pleasurable chemicals in their brains. These behaviors are repeated because they provide short-term rewards, which can last from hours to years. Furthermore, the quote implies that over generations, there is a long-term reproductive success loop, meaning that certain behaviors are repeated because they contribute to the overall success of the individual's offspring. Essentially, this quote highlights the role of immediate gratification and reproductive success in driving human behavior.

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