Impaired detection of happy facial expressions in autism.

For the arousal ratings, a three-way ANOVA revealed the significant main effect of stimulus type, indicating higher arousal ratings for normal than for anti- expressions, F (1,36) = 57.41, p = 0.000, η 2 p = 0.615, and marginally significant main effect of group, F (1,36) = 3.47, p = 0.071, η 2 p = 0.088.

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Besides, the main effects of group and stimulus type were significant, F (1,32) = 5.81 and 69.89, p = 0.022 and 0.000, η 2 p = 0.155 and 0.685, respectively, and interactions of group × stimulus type and stimulus type × emotion reached marginal significance, F (1,32) = 3.41 and 3.27, p = 0.074 and 0.080, η 2 p = 0.093 and 0.095, respectively.

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