Fig. 2.

Behavioral effects. A Group × Stroop × Frequency ANOVA on the visual data revealed both a response time effect of Stroop (VS > VNS) and Frequency (LF > HF) (see A: four leftmost bars for KS and B: four leftmost bars for Controls) but no overall difference between KS and Controls. An interaction between Stroop and Frequency was found, indicating that the frequency effect is diminished in the presence of a Stroop task, however, this effect was only significant in Controls (A: Compare difference between columns 1–2 and 3–4) and not in KS (B: Compare difference between columns 1–2 and 3–4). Together, this resulted in a significant three-way interaction between Group, Stroop and Frequency. For accuracy (C and D) only main effects of Stroop and Frequency was found. When making another ANOVA contrasting Group, Perceptual Modality and Frequency, we only found main effects of modality and Frequency (A and B - four rightmost bars). See caption for Fig. 1 for abbreviations.