“…For aviation security, identification of determinants of x-ray screening performance is of particular importance. Hitherto, selection of the most "talented" x-ray screening applicants (in terms of visual abilities needed to cope with image-based factors) and training of visual knowledge is practiced (Bolfing & Schwaninger, 2009;Halbherr, Schwaninger, Budgell, & Wales, 2013). However, as shown by covert tests, these activities are insufficient to guarantee that screeners act correctly when confronted with real threat items at a security checkpoint, especially when exposed to something unexpected (Schwaninger, 2009;Wetter, Hardmeier, & Hofer, 2008).…”