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Foreshortening affects both uphill and downhill slope perception at far distances

Published online by Cambridge University Press:  08 October 2013

Helen E. Ross
Helen E. Ross*
Affiliation:
Department of Psychology, University of Stirling, Stirling FK9 4LA, Scotland, United Kingdom. [email protected]/staff/staff-profiles/honorary-staff/helen-ross
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Abstract

Perceived slope varies with the viewing distance, and is consistent with the effects of foreshortening. Distant viewing makes uphill slopes appear steeper and downhill slopes flatter than does near viewing. These effects are obvious to skiers and climbers in mountainous country. They have also been measured in outdoor experiments with controlled viewing distances. There are many other sources of slope illusions.

Type
Open Peer Commentary
Information
Behavioral and Brain Sciences , Volume 36 , Issue 5 , October 2013 , pp. 563 - 564
Copyright
Copyright © Cambridge University Press 2013 

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References

Bressan, P., Garlaschelli, L. & Barracano, M. (2003) Anti-gravity hills are visual illusions. Psychological Science 14:441–49.Google Scholar
Bridgeman, B. & Hoover, M. (2008) Processing spatial layout by perception and sensorimotor interaction. The Quarterly Journal of Experimental Psychology 61(6):851–59.Google Scholar
Creem-Regehr, S. H., Mohler, B. J. & Thompson, W. B. (2004) Perceived slant is greater from far versus near distances. (Abstract). Journal of Vision 4(8):374a. doi:10.1167/4.8.374. Available at: http://journalofvision.org/4/8/374/.Google Scholar
Li, Z. & Durgin, F. H. (2009) Downhill slopes look shallower from the edge. Journal of Vision 9(11):6–15.Google Scholar
O'Shea, R. P. & Ross, H. E. (2007) Judgments of visually perceived eye level (VPEL) in outdoor scenes: Effects of slope and height. Perception 36:1168–78.Google Scholar
Proffitt, D. R., Bhalla, M., Gossweiler, R. & Midgett, J. (1995) Perceiving geographical slant. Psychonomic Bulletin and Review 2(4):409–28.CrossRefGoogle ScholarPubMed
Ross, H. E. (1974) Behaviour and perception in strange environments. Allen & Unwin.Google Scholar
Ross, H. E. (1994) Scaling the heights. Scottish Mountaineering Club Journal 255(185):402–10.Google Scholar
Ross, H. E. (2006) Judgements of frontal slope in nearby outdoor scenes. In: Fechner Day 2006, ed. Kornbrot, D. E., Msetfi, R. M. & MacRae, A. W., pp. 257–62. International Society for Psychophysics.Google Scholar
Ross, H. E. (2010) Perspective effects in frontal slope perception. In: Fechner Day 2010, ed. Bastianelli, A. & Vidotto, G., pp. 87–92. International Society for Psychophysics.Google Scholar
Sabra, A. I. (1989) The Optics of Ibn al-Haytham. Books I-III: On direct vision. Vol. 1, trans. Sabra, A. I., pp. 163–66. The Warburg Institute, University of London.Google Scholar
Yang, Z. & Purves, D. (2003) A statistical explanation of visual space. Nature Neuroscience 6(6):632–40.CrossRefGoogle ScholarPubMed