Even though the rodent brains had not evolved to use these signals, they were able to rewire themselves to handle the upgrade, correctly discriminating between colored lights to win soy-milk rewards.

• 美国加州大学圣巴巴拉分校的研究人员，将带有第三种感光色素的基因插入小鼠的X染色体，即便小鼠的大脑过去并未演化出分辨红绿色的能力，却能重新连接线路来运用这项新的功能。