People’s judgments about their present state are based on whether it is better or worse than the state to which they have become accustomed.9 Adaptation is, in part, just a property of neurons: Nerve cells respond vigorously to new stimuli, but gradually they “habituate,” firing less to stimuli that they have become used to. It is change that contains vital information, not steady states. Human beings, however, take adaptation to cognitive extremes. We don’t just habituate, we recalibrate. We create for ourselves a world of targets, and each time we hit one we replace it with another. After a
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