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

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Styrkowiec P., Kras D.

Polish Psychological Bulletin

2015

vol. 46

issue 4

633-646

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.

Vizuální percepce a její narušení u schizofrenního onemocnění : přehledová studie

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Paštrnák M., Dorazilová A., Rodriguez M.

Československá psychologie (Czechoslovak Psychology)

2017

vol. 61

issue 6

593-604

Research on visual perception in schizophrenia has brought a large amount of data showing perceptual impairments in patients suffering from schizophrenia. These impairments manifest in abnormalities in perceptual organization as well as in more subtle symptoms such as contrast sensitivity, form and motion perception. They are present even in patients in remission and in their relatives and they change during the course of the illness. Considering that they are partial manifestations of neurobiological abnormalities and alterations in connectivity in the brain, investigating them might contribute to better understanding of the illness. The article presents a summary of major research in visual perception impairments in schizophrenia.

Výzkum vizuální percepce u schizofrenie přinesl mnoho poznatků naznačujících narušení percepce u pacientů trpících schizofrenií. Tato narušení se projevují v abnormalitách v percepční organizaci, ale i v subtilnějších symptomech, jako v senzitivitě ke kontrastu, v percepci tvaru či pohybu. Tato narušení jsou přítomna jak u pacientů v remisi, tak u jejich příbuzných a mění se v průběhu nemoci. Předpokládá se, že jsou dílčí manifestací neurobiologických abnormalit a změn konektivity v mozku, a proto jejich zkoumání může přispět k lepšímu porozumění onemocnění. Příspěvek přináší přehled nejdůležitějších výzkumných zjištění týkajících se narušení vizuální percepce u schizofrenie.

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1 Polish Psychological Bulletin

1 Československá psychologie (Czechoslovak Psychology)

1 Dorazilová A.

1 Kras D.

1 Paštrnák M.

1 Rodriguez M.

1 Styrkowiec P.

1 2017

1 2015

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

Vizuální percepce a její narušení u schizofrenního onemocnění : přehledová studie