New research sheds light on how humanvision perceives scale astonuniversity PLOSONE
] found that the orientation of the blur gradient was unimportant. Unfortunately, however, since there was no condition of uniform blur, it is not clear whether the inclusion of blurwas the important factor in their study—it is possible, in principle, that merely blurring their images was sufficient to achieve their subjective effects. This would also explain the failure to find a blur orientation effect.
To meet our design criteria, we devised a two-alternative, forced-choice task in which our participants made judgements about which one of two images was a photograph of a full-scale scene and which was a small scale model. . In 2AFC, as defined by Green and Swets [], there is ground truth, and the results provide an objective performance measure that relates to the observer’s sensitivity to the target which is randomly allocated to one of the two response intervals.
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