There was a marginally significant interaction between handedness direction and handedness strength [ F (1,62) = 3.28; p = .07; η p 2 = 0.05], but since this was only a marginal trend, we did not examine it further.
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Telling right from right: the influence of handedness in the mental rotation of hands.
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The sentences
Although Tukey post hoc tests did not find significant differences, the data pattern still showed a trend for a “wrong-hand effect”: Mixed left-handers tended to have higher accuracy for right-hand stimuli ( M = 91% ± 2%) than for left-hand stimuli ( M = 86% ± 2%); mixed right-handers tended to have higher accuracy for left-hand stimuli ( M = 92% ± 2%) than for right-hand stimuli ( M = 83% ± 6%).
There was a significant interaction between the two factors [ F (1,37) = 4.94; p = .03; η p 2 = 0.12], but post hoc tests did not find any significant differences or an obvious trend.