Five items measure the extent to which a person had difficulty concentrating on a simulated grocery shopping task. Used across two MTurk experiments in which some participants were exposed to an unrelated phone conversation during the task, the scale source was not identified.
Sciandra, M. R., Inman, J. J., & Stephen, A. T. (2019). Smart phones, bad calls? The influence of consumer mobile phone use, distraction, and phone dependence on adherence to shopping plans. Journal of the Academy of Marketing Science, 47(4), 574–594.
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