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In Psychology, the numerical Stroop effect demonstrates the relationship between numerical values and physical sizes. When digits are presented visually, they can be physically large or small, irrespective of their actual values. Congruent pairs occur when size and value correspond while incongruent pairs occur when size and value are incompatible. It was found that when people are asked to compare digits, their reaction time tends to be slower in the case of incongruent pairs. This reaction time difference between congruent and incongruent pairs is termed the numerical Stroop effect
In a numerical Stroop experiment, participants carry out a physical or a numerical size judgement task in separate blocks. In the numerical task, participants respond to the values and ignore the physical sizes and in the physical task, participants respond to the sizes and ignore the values. It is also possible to add neutral pairs to the basic task. In neutral pairs the two digits vary in one dimension only. Neutral pairs enable measuring facilitation and interference.