Abstract

The Poggendorff illusion is one of the most exhaustively studied illusions. Can it be revived as an interesting problem? Perhaps by moving it to a slightly different domain. Here, we consider the occlusion of a subjectively linear ramp of tonal values. In a simple experiment, we find results closely resembling those of the geometrical Poggendorff. Yet, the “explanations” offered for the latter hardly apply to the former case. Depending upon one's perspective, this may be taken to “revive” the Poggendorff illusion.

Highlights

  • As the authors happened to meet as lecturers at a summer course, sheer serendipity induced them to ask whether the Poggendorff might occur in different sections of the six-dimensional data volume

  • Our question was whether the two visible legs of the ramp would reveal an illusory offset in brightness analogous to the offset in “height” characteristic of the traditional Poggendorff illusion

  • We decided to render the occluder in black–white texture, and the background deep blue (Figure 1) because neither can be comfortably matched to a uniform gray level

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Summary

Introduction

As the authors happened to meet as lecturers at a summer course, sheer serendipity induced them to ask whether the Poggendorff might occur in different sections of the six-dimensional data volume (two spatial, one temporal, and three chromatic degrees of freedom). Our question was whether the two visible legs of the ramp would reveal an illusory offset in brightness analogous to the offset in “height” characteristic of the traditional Poggendorff illusion. The occluder and the background should not offer anchor points for the ramp.

Results
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