Spatial attention shifts contribute to the size congruity effect

The size congruity effect in a numerical Stroop task shows that magnitude judgments of two numbers are faster and more accurate when the numerically larger number also appears physically size, indicating interaction between physical magnitudes. It has recently been suggested spatial shifts attention may contribute to effect. However, complete line evidence for attentional attribution remains be established. Therefore, present study aimed provide further demonstrations idea during regarding either or dimension numbers. Participants were sequentially simultaneously presented with pair single-digit Arabic whose magnitudes varied independently. They instructed perform judgment value paired Across three experiments, we consistently found was reduced eliminated pairs compared they simultaneously. Because sequential presentation mode successively at central fixation therefore should completely precluded by stimuli, findings support notion simultaneous play an important role generating both tasks.