Sterchi, Yanik

Sterchi, Yanik


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  • Publikation
    Traditional visual search vs. X-ray image inspection in students and professionals: Are the same visual-cognitive abilities needed?
    (Frontiers, 2019) Hättenschwiler, Nicole; Merks, Sarah; Sterchi, Yanik; Schwaninger, Adrian [in: Frontiers in Psychology]
    The act of looking for targets amongst an array of distractors is a cognitive task that has been studied extensively over many decades and has many real-world applications. Research shows that specific visual-cognitive abilities are needed to efficiently and effectively locate a target among distractors. It is, however, not always clear whether the results from traditional, simplified visual search tasks conducted by students will extrapolate to an applied inspection tasks in which professionals search for targets that are more complex, ambiguous, and less salient. More concretely, there are several potential challenges when interpreting traditional visual search results in terms of their implications for the X-ray image inspection task. In this study, we tested whether a theoretical intelligence model with known facets of visual-cognitive abilities (visual processing Gv, short-term memory Gsm, and processing speed Gs) can predict performance in both a traditional visual search task and an X-ray image inspection task in both students and professionals. Results showed that visual search ability as measured with a traditional visual search task is not comparable to an applied X-ray image inspection task. Even though both tasks require aspects of the same visual-cognitive abilities, the overlap between the tasks was small. We concluded that different aspects of visual-cognitive abilities predict performance on the measured tasks. Furthermore, although our tested populations were comparable in terms of performance predictors based on visual-cognitive abilities, professionals outperformed students on an applied X-ray image inspection task. Hence, inferences from our research questions have to be treated with caution, because the comparability of the two populations depends on the task.
    01A - Beitrag in wissenschaftlicher Zeitschrift
  • Publikation
    Effects of time on task, breaks, and target prevalence on screener performance in an X-ray image inspection task
    (2019) Buser, Daniela; Sterchi, Yanik; Schwaninger, Adrian; John, Mala [in: 53rd IEEE International Carnahan Conference on Security Technology]
    Currently, it is not clear how long security officers can maintain their performance when inspecting X-ray images of passenger bags for prohibited items. New technologies and working environments in airport security screening could profit from longer screening durations, and they might also facilitate performance upkeep. In our study, two groups of security officers conducted a one-hour simulated cabin baggage screening task. One group took 10-minute breaks every 20 minutes; the other worked continuously. Both groups worked under two different target prevalence conditions. Results showed a shift in response tendency that developed at the beginning of the task. Moreover, security officers were able to maintain their visual inspection performance over the course of one hour. There was no difference in performance between the group with breaks and the group without breaks. These results lay the groundwork for further testing longer screening durations in the field.
    04 - Beitrag Sammelband oder Konferenzschrift