The Neuroscience of Smiling vs. Frowning: Which is Easier?

Smiling is easier than frowning. This is because smiling uses fewer muscles than frowning. The zygomaticus major and minor muscles are responsible for smiling, while the corrugator supercilii and procerus muscles are responsible for frowning. Additionally, smiling is a natural expression that is associated with happiness and positive emotions, while frowning is associated with sadness and negative emotions.