Mathey & Gobin, 2010 found that, though a word's emotional valence influences visual identification, its orthographic neighbours are also a factor in processing speed; they suggest further investigation on this issue. A primary finding of the study was that words with a negative, higher-frequency orthographic neighbour were recognised more slowly than those with a neutral one. This once again is an additional factor that should be controlled for when using an emotional Stroop test in research. See also Cognition Cognitive bias Cognitive neuropsychology Neuropsychology References Psychological tests and scales