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. 2017 Nov 29;8(6):2041669517735541. doi: 10.1177/2041669517735541

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© The Author(s) 2017

This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 6. — Comparison of distance functions. (a) Hyperbolic functions (red) are fitted to power functions (green) predicting relationships between visual (Z_v) and physical (Z_p) distance. Distances of the vanishing point (VP) specify the hyperbolic functions. (b) Linear contraction functions (blue) are fitted to power (green) and hyperbolic functions (red). Z_v, Z_p, and VP are distances expressed in meters.