Introduction: The aim of this study was to evaluate the practice effect of 5 repetitions of alternate forms of Colour Word Stroop test
(CWST) and effect of order. This was aimed at determining the number of efforts required to attenuate the practice effect. Material
and methods: 5 alternate versions of the CWST were administered to 43 young healthy adult males and female who were divided
into 5 different groups randomly on the basis of the sequence of administration of 5 different versions of CWST. Results: Repeated
measure ANOVA revealed that practice effect occurred on consecutive administration of the test, but its effect diminished after 4
repetitions. No significant difference between orders of administration of 5 versions was found. Conclusion: Minimum 4 sessions of
practice should be given with the alternate forms of CWST to diminish the effect of learning.
Keywords: Practice effect; Stroop test; Neuropsychological; Cognitive interference; Colour word test