Feature instructions improve face-matching accuracy.

A series of paired-sample t -tests (with alpha adjusted to 0.05/3 = 0.017 for three comparisons) showed a trend for faster response times after instructions in the eyebrows condition (5.14 vs. 3.72 seconds), t (19) = 2.30, p = 0.03, d = 0.49, but not in the eyes condition (3.87 vs. 4.06 seconds), t (19) = 0.38, p = 0.71, d = 0.07, or in the ears condition (3.69 vs. 4.03 seconds), t (19) = 0.64, p = 0.53, d = 0.15.

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However, a marginally significant main effect of feature, F (2,57) = 3.15, p = 0.05, ƞ p 2 = 0.10, and an interaction of feature and instruction was found, F (2,57) = 8.72, p < 0.001, ƞ p 2 = 0.23.

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