Are the obtuse angles the key components of the Poggendorff illusion

Peter Wenderoth, Michael Johnson

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)165-172
Number of pages8
Issue number2
Publication statusPublished - 1981
Externally publishedYes


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