Visual orientation illusions: Global mechanisms involved in hierarchical effects and frames of reference

Roberta Daini*, Peter Wenderoth, Stuart Smith

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    Five experiments were conducted in order to determine which of two hypotheses, initially proposed by Rock (1990), accounts for interactions between oriented elements in a visual scene. We also explored the suggestion that two hypothetical processes - namely, frame of reference and hierarchical organization describe phenomena arising from distinct mechanisms (Spinelli, Antonucci, Daini, Martelli, & Zoccolotti, 1999). Double inducing stimulus versions of one-dimensional and two-dimensional tilt illusions, the rod-and-frame illusion, and combinations of these were used. Our data suggest that both hypotheses can predict orientation interactions in conditions in which only one mechanism-namely, the global visual mechanism of symmetry axes extraction (Wenderoth & Beh, 1977) - is activated. Which hypothesis is appropriate to predict the perceived orientation depends on some physical features of the objects.

    Original languageEnglish
    Pages (from-to)770-778
    Number of pages9
    JournalPerception and Psychophysics
    Volume65
    Issue number5
    Publication statusPublished - Jul 2003

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