每当我们微笑时，神经和肌肉就会传递信息使大脑的快乐中心兴奋，莱尔德猜测说。
Whenever we smile, nerves and muscles may transmit messages that turn on happiness centers in the brain, Laird speculates.
真正的抽筋是由于肌肉神经的兴奋过度造成的。
True cramps are caused by hyperexcitability of the nerves of a muscle.
研究通过在研究对象的脸上放置皮肤传感器检测其对于积极、消极情感的肌肉反应，在脚上放置皮肤传感器测量其兴奋度。
The research was conducted by placing skin sensors on the subjects' faces to measure muscle movement associated with positive and negative emotion, and on their feet to measure arousal.
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