Direct and pairwise area estimation of physical shapes through vision and touch
Brown University, Rhode Island, USA.Perceptual and Motor Skills (Impact Factor: 0.66). 04/2012; 114(2):391-6. DOI: 10.2466/27.PMS.114.2.391-396
On a perceptual task in which a participant estimated areas of five physical rigid shapes, participants could view and touch the shapes, using one of two estimation methods, direct or pairwise. For the direct method, participants held one shape at a time and estimated the area based on a unit square (equal to 1/10 of the actual area). Mean error by participants was 14.4%. In the pairwise method, when participants were simultaneously handed two shapes, their error was 0.3%. Both direct and pairwise errors for vision plus touch of physical stimuli were considerably lower than previous errors made when viewing with an overhead projector screen.
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ABSTRACT: The number of studies related to visual perception has been plentiful in recent years. Participants rated the areas of five randomly generated shapes of equal area, using a reference unit area that was displayed together with the shapes. Respondents were 179 university students from Canada and Poland. The average error estimated by respondents using the unit square was 25.75%. The error was substantially decreased to 5.51% when the shapes were compared to one another in pairs. This gain of 20.24% for this two-dimensional experiment was substantially better than the 11.78% gain reported in the previous one-dimensional experiments. This is the first statistically sound two-dimensional experiment demonstrating that pairwise comparisons improve accuracy.Perceptual and Motor Skills 03/2009; 108(1):37-42. DOI:10.2466/PMS.108.1.37-42 · 0.66 Impact Factor
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