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Integration of stimulus dimensions in judgments of area and shape: Modeling guided by level curves
Stockholm University, Faculty of Social Sciences, Department of Psychology.
2015 (English)In: Fechner Day 2015: Proceedings of the 31st Annual Meeting of The International Society for Psychophysics / [ed] S. Grondin & V. Laflamme, Québec, Canada: International Society for Psychophysics , 2015, 17-17 p.Conference paper, Poster (Refereed)
Abstract [en]

In the horizontal-vertical (H-V) illusion (Künnapas, 1958) the judged V/H ratio is larger than the physical ratio. This tendency is not found in V/H ratio judgments of rectangles (Gärling & Dalkvist, 1977), but these judgments are not based on the simple ratio of V and H: Level-curves (iso-judgment contours) of logarithmized data show that the larger dimension is more important than the smaller. Developmentally, judgments of rectangular area have been described as changing from adding V and H in children to multiplying  them in adults (Wilkening, 1979). However, level curves demonstrate deviations from simple models at all ages. Adults’ area judgments show a greater importance of the larger dimension, and also a greater importance of H than of V, but accurate modeling is difficult. Here, level-curve plots (using R’s contour function) prove invaluable for graphic guidance of modeling by displaying systematic judgment tendencies that go unnoticed with conventional factorial plots.

Place, publisher, year, edition, pages
Québec, Canada: International Society for Psychophysics , 2015. 17-17 p.
Keyword [en]
area judgment, shape judgment, level curves, mathematical modeling
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Research subject
URN: urn:nbn:se:su:diva-126035OAI: diva2:896953
Fechner Day 2015: 31st Annual Meeting of The International Society for Psychophysics
Available from: 2016-01-22 Created: 2016-01-22 Last updated: 2016-01-22

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Hellström, Åke
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