The range through these states is mediated by the arousal system, a network of tracts converging from sensory systems to integrating centers in the brain stem.

这些状态的变化是以激发系统作为媒介完成的，而所谓激发系统，是指从各个感觉系统汇聚到位于脑干中整合中心的一个网络。

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Arousal is at first general, with a flooding of impulses in the brain stem; then gradually the activation is channeled.

一开始觉醒是普遍的，在脑干中有大量的脉冲，然后激活作用逐渐被输送。

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The brain is resistant to arousal during deep sleep, which explains why it's difficult to wake a sleepwalker.

深度睡眠时大脑对外界的激励有抵抗力，这解释了为什么很难叫醒梦游者。

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Other companies focus more specifically on the brain connection to arousal disorder.

FORBES: Health

"We started to look into the brain to see what was happening and found that during those periods of arousal, the 'habit' regions in the brain were activated, " Sinha says.

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PT-141 (short for Palatin Technologies) works very differently: It interacts with melanocortin receptors in the brain, nerves involved in sexual arousal.

FORBES: A novel way, perhaps, to treat sexual dysfunction.