Forest before illusory trees: illusory contours of local level elements do not influence perceptual global advantage in the hierarchical structure processing

• Authors: Piotr Styrkowiec , Dominika Kras
• Languages of publication: EN

Abstracts

EN

There is a continuing debate in the field of perceptual organization as to whether the locus of global processing is early or late perceptual, as previous studies have yielded contrary results. The conducted behavioural study explored this issue with the paradigm of collating global processing with other process of perceptual organization, namely illusory contours processing. Interaction between these two processes of perceptual organization would indicate that global processing has an early perceptual locus, whereas the lack of such interaction would suggest the late perceptual locus of global processing. In experiment 1, the effect of global dominance was obtained with the use of a compound figure composed of geometrical shapes with real edges. Results showed that the processing of the figure at the global level was faster and that it disrupted the processing of the figures from the local level. In experiment 1b, the compound figure was composed of local geometrical shapes generated with the use of the line-end induced illusory contours (Ehrenstein illusion). Local elements with illusory contours did not affect the processing of the hierarchical structure and the effect of global precedence occurred without any changes. In experiment 2a, a global advantaged effect within a compound figure with local elements with real edges was obtained in the paradigm of attention divided between levels of the hierarchical structure. When illusory contours of local elements of a compound figure were introduced to this paradigm (experiment 2b), this again had no effect on the perceptual global advantage. The results demonstrate the lack of interaction between global processing and illusory contour processing, indicating that the locus of global processing is rather late perceptual.

Keywords

EN

perceptual organization; global and local processing; illusory contours; locus of perceptual global advantage

• Publisher: Polska Akademia Nauk
• Journal: Polish Psychological Bulletin
• Year: 2015
• Volume: 46
• Issue: 4
• Pages: 633-646

Dates

published

2015-12-01

online

2015-11-26

Contributors

author

Piotr Styrkowiec

• Institute of Psychology, University of Wroclaw, Poland

author

Dominika Kras

• Institute of Psychology, University of Wroclaw, Poland

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Identifiers

DOI

10.1515/ppb-2015-0070