PMID: 2096363Jan 1, 1990Paper

The magic wand: a new stereokinetic anomalous surface

Perception
M Zanforlin, G Vallortigara

Abstract

When a disc with two dots stuck on it a few centimetres apart is set in slow rotatory motion, the two dots appear displaced in depth and rigidly connected to form the two extremities of a rod. The rod appears as a diaphanous transparent object, slightly tinted to the same colour as the dots. Experimental analysis of the phenomenon shows that it is different from previously observed 'moving phantoms', 'motion-induced contours', and 'stereokinetic induced phantoms'. But it shows similarities with all three phenomena: the colour spreading along the apparent rod is facilitated by low illumination and is clearly visible under high illumination with bright colours only; it is seen only when the two dots appear to move with apparent displacement in depth and not when they appear to lie on the plane of the disc. When line-drawn circles instead of full colour dots are used, the anomalous surface of the rod appears to have colourless vitreous transparency. With half-line circles it is clearly visible as an opaque rod of the same colour as the background. When squares or diamonds are used instead of dots, a three-dimensional prism can be observed which has similar appearance to the rod.

References

May 30, 1975·Science·P Tynan, R Sekular
Nov 1, 1988·Perception & Psychophysics·M Zanforlin, G Vallortigara
May 1, 1988·Perception & Psychophysics·A Ishiguchi
Jan 1, 1987·Perception·P Bressan, G Vallortigara
Jan 1, 1986·Vision Research·G VallortigaraM Zanforlin
Jan 1, 1984·Vision Research·C RediesK Kunz
Jan 1, 1984·Perception·S C Masin
Aug 1, 1983·Perception & Psychophysics·V Klymenko, N Weisstein
Jan 1, 1982·Perception·V Klymenko, N Weisstein
Jan 1, 1982·Perception·C Redies, L Spillman

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Citations

Sep 1, 1995·Psychonomic Bulletin & Review·G W Lesher
Mar 1, 1992·Perception & Psychophysics·F Purghé, S Coren
Aug 9, 2001·Journal of Mathematical Psychology·E. XausaL. M. Zanforlin
Jan 1, 1997·Perception·S C Masin

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