Editing Stroop effect (section)

=== Numerical ===
The [[Numerical Stroop effect]] demonstrates the close relationship between numerical values and physical sizes. Digits symbolize numerical values but they also have physical sizes. A digit can be presented as big or small (e.g., <big>5</big> vs. 5), irrespective of its numerical value. Comparing digits in incongruent trials (e.g., <big>3</big> 5) is slower than comparing digits in congruent trials (e.g., <big>5</big> 3) and the difference in reaction time is termed the numerical Stroop effect. The effect of irrelevant numerical values on physical comparisons (similar to the effect of irrelevant color words on responding to colors) suggests that numerical values are processed automatically (i.e., even when they are irrelevant to the task).<ref>{{cite journal|last1=Henik|first1=A|last2=Tzelgov|first2=J|title=Is three greater than five: The relation between physical and semantic size in comparison tasks|journal=Memory & Cognition|date=1982|volume=10|issue=4|pages=389–395|doi=10.3758/BF03202431|pmid=7132716|doi-access=free}}</ref>