Cite as:
Wenderoth P, Johnson M, 1981, "Are the obtuse angles the key components of the Poggendorff illusion?" Perception 10(2) 165 – 172
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Are the obtuse angles the key components of the Poggendorff illusion?

Peter Wenderoth, Michael Johnson

Received 21 November 1980, in revised form 16 January 1981

Abstract. An experiment is reported which confirms and extends a previous finding that amputations of the Poggendorff figure do not necessarily result in large positive effects with obtuse-angle stimuli, and small or even negative effects with acute-angle stimuli. Indeed, the acute-angle effects found were significantly greater than the obtuse-angle effects, and the full Poggendorff error was not explicable in terms of the linear summation of the component-angle effects. An 'alignment displacement effect' reported earlier by Hotopf and Obonai was shown to occur, but could not be an important component of the Poggendorff illusion.

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