Blocking mimicry makes true and false smiles look the same.

The differences between free mimicry and muscle-control conditions were not significant, F (1, 43)<1, while differences between the free mimicry and blocked mimicry conditions, and between the muscle-control and blocked mimicry conditions were highly significant F (1, 42) = 24.59, p <.001, η 2 = 0.40, and F (1, 41) = 30.40, p <.001, η 2 = 0.43, respectively.

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