Abstract

Free modulus magnitude estimation was used to assess the perceived urgency of speech and non-speech warnings. Three nonspeech warnings (Priority 1, Priority 2 and Priority 3) and three speech warnings (‘Deadly’, ‘Warning’ and ‘Note’) were selected and three versions of each warning were generated which differed in their level of urgency. The results indicated that there was no significant difference overall between the two modes of warning. A main effect for priority was found, with higher priority warnings being rated as more urgent, and urgency within each warning had an overall significant effect. Priority and mode interacted, showing that the range of urgency ratings given to the nonspeech warnings was higher than for the speech warnings.

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