Children can discriminate the authenticity of happy but not sad or fearful facial expressions, and use an immature intensity-only strategy.

Finally, for fear, the pretend items were significantly more intense overall than the genuine items, t (25) = 5.55, p < 0.001; and for these stimuli even adults could not discriminate authenticity above chance (indeed, they showed a trend in the opposite direction, i.e., toward perceiving the pretend item as more authentic than the genuine one).

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