We find it harder to frown when viewing a smile than when viewing a frown. This can most clearly be attributed to

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Quizplus · Accepted Answer

Mirror neurons are specialized cells in our brain that are activated both when we perform a certain action and when we observe someone else performing the same action. This means that when we see someone else smiling, the mirror neurons in our brain also fire, creating a neural impulse that makes us feel like smiling as well. On the other hand, when we see someone frowning, our mirror neurons do not fire in the same way, making it harder for us to mimic the expression. Therefore, the fact that we find it harder to frown when viewing a smile than when viewing a frown can be attributed to the activation of mirror neurons.

We Find It Harder to Frown When Viewing a Smile