研究人员还分析了其他影响寿命的变量，如食谱、环境、代谢率等，但大脑的大小成为最有意义的预测指标。
The researchers analyzed other variables that could affect longevity like diet, environment, metabolic rates and found that the most significant predictor was brain size.
当一个新的或者是显著的刺激发生的时候，大脑的多巴胺神经元增快了它们的代谢率，加速多巴胺的释放。
When a novel or salient stimulus occurs, the dopamine neurons in the brain increase their firing rate, boosting the release of dopamine.
当一个新的或者是显著的刺激发生的时候，大脑的多巴胺神经元增快了它们的代谢率，加速多巴胺的释放。
When a novel or salient stimulus occurs, the dopamine neurons in the brain increase their firing rate, boosting the release of dopamine.
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