We have all heard these words:“just put on a happy face” or “turn that frown upside down”. Can the simple act of smiling actually make us feel better? Our face is formed by a variety of rather thin bones.
The muscles that attach to these bones become smaller when we are happy or when we want to laugh. The resulting facial expression is universally recognized as a smile and indicates our positive emotional status. Sometimes, people present fake (假的) smiles. But how does the brain achieve both types of smiles using the same facial muscles? It all depends upon which part of the brain starts the smile.
If the brain's dopamine neurons (多巴胺能神经元) start the smile, then the smile looks sincere. If the brain's motor cortex starts the smile, in other words, if we are consciously willing ourselves to smile, then a slightly different set of facial muscles are actirated. It can be difficult to describe precisely how real and fake smiles differ, but we are all very capable at knowing the difference.
But can forcing yourself to smile produce the same kinds of good feelings as a real smile does? Anything that prompts the release of dopamine in the brain brings pleasure.
For example,
cocaine and coffee both release dopamine in the brain.
The release of dopamine in the front half of our brain is accompanied by a real smile. But can this process be reversed? What about putting on that happy face? Can the simple act of smiling bring pleasure? Yes. When we smile, fake or real, the contraction of the facial muscles slightly distorts (扭曲) the shape of the thin facial bones. This slight distortion in their shape leads to an increase in blood flow into the brain and then increases the release of dopamine.
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