A new interference score for the Stroop test.

A New interference calculation method for the Stroop test was developed based upon a neuropsychological model of the suppression of word reading in favor of color naming. Polynomial regression equations show a significant relationship between word reading and the New interference score that closely fits the underlying prediction of the New model, while the Golden [Stroop Color and Word Test, Stoelting Co., IL, Wood Dale, 1978] model (Old) produces only a random relationship. Constructs of developmental maturation and lateralized brain damage are supported by the New but not the Old method. The New compared to the Old method also gives a significant reduction in scores in a small sample of demented patients. It would be advisable to use this New model in both cognitive and neuropsychological comparisons of different lesions or different stimulus and response demands. The New model will also help promote finer clinical inferences when an understanding relative to the patient's own baselines is necessary. Copyright 2003 National Academy of Neuropsychology