# Human factors in X-ray image inspection of passenger Baggage – Basic and applied perspectives

Sterchi, Yanik. Human factors in X-ray image inspection of passenger Baggage – Basic and applied perspectives. 2019, Doctoral Thesis, University of Basel, Faculty of Psychology.

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Official URL: http://edoc.unibas.ch/diss/DissB_13243

Because there is some freedom in the decision whether a suspicious object should be declared as a threat or as harmless, the results of X-ray image inspection in terms of hit and false alarm rate depend on the screeners’ response tendency. Manuscript 2 evaluated whether three commonly used detection measures – ${d}'$, ${A}'$, and ${d}_{a}$ – are a valid representation of detection performance that is independent from response tendency. The results were consistently in favor of da with a slope parameter of around 0.6. In Manuscript 3 it was further shown that screeners can change their response tendency to increase the detection of novel threats. Also, screeners with a high ability to recognize everyday objects detected more novel threats when their response tendency was manipulated.