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. 2019 Jul 8;4:21. doi: 10.1186/s41235-019-0171-6

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — How useful field of view (UFOV) is defined (in terms of degrees of visual angle (dva)) directly influences the outcome of downstream analyses, such as error classification and image coverage. In this hypothetical example, an observer fixated three times (represented by concentric circles) on an image with a visible lung-nodule (located in the red box) but failed to report it. Using a smaller UFOV, the missed abnormality would be considered a search error. However, it would be classified as a recognition or decision error using the largest UFOV estimate. Similarly, estimated image coverage varies considerably with UFOV size. Critically, the size of the UFOV is both task-dependent and observer-dependent (Drew, Boettcher & Wolfe 2017; Young & Hulleman, 2013; Ebner et al., 2017)