Characterization of the Haptic Shape-Weight Illusion with 3D Objects

Kahrimanovic, M.; Tiest, Wouters Bergmann; Kappers, Astrid M. L.

doi:10.1109/toh.2011.22

Cited by 12 publications

(16 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When participants were asked to enclose the objects (sphere, cubes or tetrahedrons), Weber fractions for weight discrimination were even higher (0.29). They were also higher than volume discrimination thresholds obtained with the same objects, so apparently weight information could not be the determining factor in volume discrimination (Kahrimanovic et al, 2011a).…”

Section: Weightmentioning

confidence: 61%

Tactile and Haptic Perceptual Organization

Kappers¹,

Tiest²

2014

Oxford Handbooks Online

View full text Add to dashboard Cite

Section: Weightmentioning

confidence: 61%

Tactile and Haptic Perceptual Organization

Kappers¹,

Tiest²

2014

Oxford Handbooks Online

View full text Add to dashboard Cite

“…It may be that information of a mechanical nature has a stronger effect on the volume percept than does information of a thermal nature, due to the level of processing at which the effect manifests itself. Previously, we have shown that the shape of three-dimensional objects has a weaker effect on haptic bimanual volume perception of large objects than on unimanual volume perception of small objects (Kahrimanovic, Bergmann Tiest, & Kappers, 2011). Volume processing of the small stimuli may occur early in processing, in the primary sensory cortex, which contains cortical areas that receive information from receptors in the skin as well as areas that receive information from receptors in muscles and joints.…”

Section: General Discussion and Conclusionmentioning

confidence: 97%

Salient material properties and haptic volume perception: The influences of surface texture, thermal conductivity, and compliance

Tiest

Kahrimanovic

Niemantsverdriet

et al. 2012

Atten Percept Psychophys

Self Cite

View full text Add to dashboard Cite

We investigated the influences of surface texture, thermal conductivity, and compliance on the haptic perception of the volume of small cubes. It was hypothesized that an object containing highly salient material properties would be perceived as larger in volume than the same object without these properties. Blindfolded subjects were asked to explore pairs of cubes differing in their material properties and to select the one with the larger volume. The results showed that, counterintuitively, a smooth cube was perceived as being significantly larger than a rough cube of the same physical volume, with average biases of about 19 %. Furthermore, cubes with a higher thermal conductivity were perceived as significantly larger than cubes with a lower thermal conductivity (average bias of about 7 %). In addition, the magnitude of the bias in this condition was not changed by increasing or decreasing the temperature of the test objects, suggesting that the effect of thermal conductivity could not be attributed directly to the heat flow. Finally, a hard cube was perceived as significantly larger than a soft cube of equal physical volume, with an average bias of about 25 %. These results reveal that the studied material properties have significant and consistent influences on the haptic perception of volume. The observed biases provide an indication of the levels at which the processing of haptic information on volume and material properties occurs.Keywords Haptics . Roughness . Coldness . HardnessObjects that we encounter in our environment can differ along a number of dimensions, like shape, size, and material. Each dimension contributes in its own way to the percept of the object, and the perception of one particular dimension may be influenced by the presence of other physical object properties. The present study focuses on the influence of salient material properties on haptic perception of the volumes of objects. Previous studies have shown that volume perception is not veridical. We have shown that small threedimensional objects with the same physical size (i.e., volume) but differing in shape are perceived as being different in size (Kahrimanovic, Bergmann Tiest, & Kappers, 2010). In that study, blindfolded subjects had to explore tetrahedrons, cubes, and spheres by touch. On each trial, they were asked to compare two differently shaped objects and to indicate the one that they perceived as being larger in volume. The largest effect of shape on volume perception was found for the comparison of tetrahedrons and spheres. A tetrahedron was perceived as being equal in volume to a sphere that was on average about 48 % larger in volume than the tetrahedron. Similarly, tetrahedrons were perceived as being larger than cubes of the same physical volume, and cubes were perceived as being larger in volume than spheres. Additional analyses of these results showed that the occurrence of these volume biases could be explained by the subjects' tendency to base their volume judgment on the surface areas of the objects. H...

show abstract

“…A contribution to the current debate on the relationship between perceived weight, expected weight, and perceived size [12,17,18,19,22,23,25] may come from the study of two illusions that have been known for a long time but that have remained relatively underexplored, namely the shape–weight illusion [26,27,28] and the brightness–weight illusion [29,30]. The main aim of the current study is to test the extent to which the two illusions can be explained in terms of the contrast between actual and expected weight, and/or in terms of the contrast between actual weight and perceived size.…”

Section: Introductionmentioning

confidence: 99%

Influence of visually perceived shape and brightness on perceived size, expected weight, and perceived weight of 3D objects

2019

View full text Add to dashboard Cite

In the size–weight illusion, when two objects of identical weight but different volume are lifted, the smaller object is typically perceived to weigh more than the larger object. A well-known explanation for this and other weight illusions is provided by the hypothesis that perceived weight results from the contrast between actual and expected weight. More recently, it has been suggested that an object’s size may exert a direct and automatic effect on its perceived weight, independently of expected weight. Here we test these two hypotheses by exploring two illusions that have been known for a long time but have remained relatively underexplored, namely the shape–weight and brightness–weight illusions. Specifically, we measured the influence of visually perceived shape and brightness on the perceived size, the expected weight, and the perceived weight of 3D plastic objects. A numerical rating task was used in Experiment 1, and a paired comparison task was used in Experiment 2. The results showed that spheres were perceived to be heavier than tetrahedrons and cubes, and cubes were perceived to be heavier than tetrahedrons. We did not find any consistent relationship between brightness and perceived weight. A systematic comparison between perceived size, expected weight, and perceived weight showed that the visual shape–weight and brightness–weight illusions are partially inconsistent with the hypothesis that perceived weight results from the contrast between actual and expected weight and with the hypothesis that perceived weight results from the contrast between actual weight and perceived size. The results appear to suggest that there may be a dissociation between the processing of variables that contribute to the conscious experience of size, such as brightness and vertical height, and the processing of variables that contribute to perceived weight, such as surface area.

show abstract

Characterization of the Haptic Shape-Weight Illusion with 3D Objects

Abstract: Abstract-The present study shows an effect of 3D shape on perceived weight of objects. This effect could be explained partly by the size-weight and the shapesize illusions, suggesting that the perceived size is not the only factor responsible for the shape-weight illusion.

Cited by 12 publications

References 17 publications

Tactile and Haptic Perceptual Organization

Tactile and Haptic Perceptual Organization

Salient material properties and haptic volume perception: The influences of surface texture, thermal conductivity, and compliance

Influence of visually perceived shape and brightness on perceived size, expected weight, and perceived weight of 3D objects

Contact Info

Product

Resources

About