On the stability of the arousal strength of warning signal words

Studies are reported that demonstrate the stability of scales of the arousal strength of warning signal words. We demonstrate that these scales are not an artefact of the measurement technique employed, nor are they influenced by the effects of experimental context. In addition, we generalize previous findings on the arousal strength of signal words to the UK population. Separate studies revealed a high level of agreement in signal word arousal strengths derived from magnitude estimation, category estimation, and cross-modality matching. In addition, the relative arousal strengths of signal words were shown to be independent of the composition of the warning stimulus set. These findings suggest that arousal strength scales of signal words are robust and that signal words can be used with confidence to achieve hazard matching between the hazard inherent in a product/situation and the hazard implied by the associated warning.