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Abstract

We consider the shape of “visual space”. One immediate complication is that there are numerous “visual spaces”, often confused in the literature. Here we focus on visual awareness, rather than optically guided behavior, and “contemplative”, rather than “enactive” vision. Even so, the number of conceptually different “visual spaces” is appreciable. Important distinctions are between visual space as a rigid image of physical space, and visual space as an entity that depends critically upon an observer’s present state. For instance, in judging the relation between two locations, an observer may fixate one or the other. Conceivably, “visual space” will change the moment the observer swaps fixations. If that is indeed the case, then many of the conventional ways to address visual space, or to analyze raw psychophysical data, become effectively invalid. Here we re-analyze a number of available data-sets from such a perspective. We suggest that our notions of “the shape of visual space” need revision and re-investigation.

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Notes

  1. 1.

    “Enaction” was introduced by Jerome Bruner [2, 3] who distinguished between iconic and symbolic knowledge. It is presently (also by us) used for knowledge that comes through action. It is acquired through motor skilled motor actions, such as handling objects and locomotion. Enactive vision is not necessarily accompanied by any acute visual awareness.

  2. 2.

    “Contemplation” is commonly defined as “to admire something and think about it”. It typically involves no motor action, but acute awareness, and is akin to meditation. Contemplative vision is also akin to artistic vision, and is so described in Hildebrand [10] with the notion of “far image” (G. Fernbild), and “serenely viewing eye” (G. das ruhig schauende Auge).

  3. 3.

    One distinguishes “interospecific” and “exterospecific” information. We don’t use the origin of the terms, but they were used by Gibson [7] to differentiate between information that relates to the observer and to the external world. For an ideal camera–eye eye–movements do not reveal any novel information about the scene, since no novel perspectives are gained. They lead to pure interospecific information. (E.g., the optic nerve activity may be used to monitor eye movements.)

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Acknowledgement

This work was supported by the Methusalem program by the Flemish Government (METH/08/02), awarded to Johan Wagemans.

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Correspondence to Jan Koenderink .

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Koenderink, J., van Doorn, A. (2013). The Shape of Space. In: Dickinson, S., Pizlo, Z. (eds) Shape Perception in Human and Computer Vision. Advances in Computer Vision and Pattern Recognition. Springer, London. https://doi.org/10.1007/978-1-4471-5195-1_10

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  • DOI: https://doi.org/10.1007/978-1-4471-5195-1_10

  • Publisher Name: Springer, London

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