Bit by bit, that wondrous entity, the human personality, is being decoded. An even temper or a short fuse, an affectionate nature or a penchant for anonymous sex, a love of thrills or a tendency to withdraw: such elements of our cherished sense of self are being revealed as less the shadings of the soul than the manifestations of neurobiology.
In some cases, we've uncovered the chemistry of personality by changing it. Consider the architect who takes Prozac for depression and finds that not only are his symptoms gone, but so is a lifelong passion for hardcore porn. "The medication redefined...
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