Although the between-group difference for the Stroop effect did not reach statistical significance at p < 0.05 using non-parametric analyses (Table 2 ), given the small sample sizes the difference between the groups’ Stroop effect was further considered by examining the effect size [ 48 ] for the between-group comparison.
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Altered patterns of cortical activation in ALS patients during attention and cognitive response inhibition tasks.
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0.0500
0.0510
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a strong trendp = 0.051
However, a strong trend ( p = 0.051) for a between-group difference was found on a further adaptation of the Stroop test, known as negative priming (NP) [ 25 ].