The three items of the Cognitive Reflection Test (CRT) were presented to all participants via Apple Macintosh computers (Lancaster University) and PC machines (University of Derby). CRT items were presented one at a time in a randomized order.  Responses for each item were recorded after participants had entered an answer in an on-screen field and had then clicked on a button to move to the next screen. Response times for each item reflected the total duration from its initial presentation to the submission of a response. Participants were excluded if they were familiar with the task and were replaced.