In our brains, where millions of signals move across anetwork of neurons like runners in a relay race, all the critical baton passes take place at synapses.

• 在我们的大脑中，数百万的信号就象接力赛运动员那样在由神经元组成的网络上飞奔，所有关键性的接力棒传递都在突触上完成。