Stroop Test - a Reference Stimulus for Psychophysiological Measurements?

Numerous experiments dealing with measuring of changes in human physiology due to mental stress are reported. In these researches, a stimulus is commonly employed to mentally, emotionally or cognitively affect the human subject and hers/his perception, resulting in changes in physiology. When evaluating such experiments from the metrology perspective, there is a clear lack of consistence and knowledge in assessing such psychological stimuli. In this paper we are presenting an attempt to evaluate a commonly used colour word conflict test the Stroop colour test, in several versions. The physiological results indicate that different versions of the Stroop test induce different levels of psychophysiological answer.