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Numerical Stroop effect : ウィキペディア英語版
Numerical Stroop effect
In Psychology, the numerical Stroop effect (related to the standard 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 (e.g., large 5 small 3) while incongruent pairs occur when size and value are incompatible (e.g., large 3 small 5). 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 (or the size incongruity effect; SICE)

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 (e.g., the pair 5 3 for the numerical task and large 3 small 3 for the physical task). Neutral pairs enable measuring facilitation (i.e., the difference in reaction time between neutral and congruent pairs) and interference (i.e., the difference in reaction time between incongruent and neutral pairs).
==Original experiments==
Besner and Coltheart (1979) asked participants to compare values and ignore the sizes of the digits (i.e., the numerical task). They reported that the irrelevant sizes slowed down responding when sizes were incongruent with the values of the digits. Henik and Tzelgov (1982) examined not only the numerical task but also the physical task. The numerical Stroop effect was found in both tasks. Moreover, when the two dimensions were congruent, responding was facilitated (relative to neutral trials) and when the two dimensions were incongruent, responding was slower (relative to neutral trials).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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