Objects exhibit body model like shape distortions

Saulton, Aurelie; Dodds, Trevor J.; Bülthoff, HH; Rosa, S de la

doi:10.1007/s00221-015-4221-0

Cited by 43 publications

(77 citation statements)

References 33 publications

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“…Subsequent studies using this paradigm have replicated this basic pattern of results and extended them in several ways (e.g., Ferrè, Vagnoni, & Haggard, 2013;Longo, 2014Longo, , 2015bLongo & Haggard, 2012a, 2012bLongo, Long, & Haggard, 2012;Longo, Mancini, & Haggard, 2015b;Mattioni & Longo, 2014;Saulton, Dodds, Bülthoff, & de la Rosa, 2015). For example, Longo and Haggard (2012a) found that these distortions were smaller in magnitude when participants judged locations on the palmar surface of the hand.…”

Section: Distortions In Position Sensementioning

confidence: 53%

Distorted Body Representations in Healthy Cognition

Longo

2017

Quarterly Journal of Experimental Psychology

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Delusions and misperceptions about the body are a conspicuous feature of numerous neurological and psychiatric conditions. In stark contrast to such pathological cases, the immediacy and familiarity of our ordinary experience of our body can make it seem as if our representation of our body is highly accurate, even infallible. Recent research has begun to demonstrate, however, that large and systematic distortions of body representation are a normal part of healthy cognition. Here, I will describe this research, focusing on distortions of body representations underlying tactile distance perception and position sense. I will also discuss evidence for distortions of higherorder body representations, such as the conscious body image. Finally, I will end with a discussion of the potential relations among different body representations and their distortions. Distortions of Body Representations 3Our body is the core of our sense of self, and central to our personal identity as an individual. We experience our body from the outside, as a physical object in the world like any other, but also from the inside, as an object of immediate experience (Bermúdez, Marcel, & Eilan, 1995). The intimate and direct connection we have with our own body can make knowledge of our body seem immune to the usual sources of perceptual error and illusion. Indeed, the very fact that we have multiple ways of knowing about our body (from inside, and from outside) could very well contribute to making the overall perception of the body highly reliable. While distortions and misperceptions of the body are a familiar result of several psychiatric and neurological conditions, it is natural to suppose that healthy adults have highly accurate -even infallible -knowledge about the physical structure of their bodies. In this paper, I will describe recent research that has begun to question this assumption, showing large and systematic distortions of body representation in healthy adults. After giving a brief summary of the varied distortions of body representation found in pathological conditions, I will describe research showing large distortions of body representations

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Section: Distortions In Position Sensementioning

confidence: 53%

Distorted Body Representations in Healthy Cognition

Longo

2017

Quarterly Journal of Experimental Psychology

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“…Previous work suggests the presence of viewercentered biases and immediate vision on hand distortions in localization tasks (Longo, 2014;Saulton et al, 2015). In line with these ideas, people might also partially rely on a general form of memory (e.g.…”

Section: Introductionmentioning

confidence: 54%

“…Indeed, localization tasks distortions were not limited to the hand and appeared to generalize onto certain types of objects, particularly in the case of a rake (Saulton et al, 2015) Distortions measured on the rake item were more similar to the one found on the participant's hand than on other objects depicting square and rectangular shapes. Although the amount of distortion was significantly smaller on the rake than on the hand, it was also characterized by an overestimation of the width axis compared to a large underestimation of the length.…”

Section: Introductionmentioning

confidence: 92%

“…However, multiple studies indicate the presence of systematic distortions in the perception of bodily proportions (Linkenauger et al, 2015;, 2011Saulton, Dodds, Bülthoff, & Rosa, 2015). Those distortions were demonstrated in visual estimations tasks (Linkenauger et al, 2015;Longo & Haggard, 2012) as well as in tactile and localization tasks , 2011.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, the localization task does not involve tactile perception, as the hand is not touched during the experimentation (see method in, Saulton et al, 2015). As such, there may be no direct link between anisotropic tactile sensitivity of the hand and hand shape distortions measured in localization tasks.…”

Section: Introductionmentioning

confidence: 99%

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The role of visual similarity and memory in body model distortions

et al. 2016

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Several studies have shown that the perception of one's own hand size is distorted in proprioceptive localization tasks. It has been suggested that those distortions mirror somatosensory anisotropies. Recent research suggests that non-corporeal items also show some spatial distortions. In order to investigate the psychological processes underlying the localization task, we investigated the influences of visual similarity and memory on distortions observed on corporeal and non-corporeal items. In experiment 1, participants indicated the location of landmarks on: their own hand, a rubber hand (rated as most similar to the real hand), and a rake (rated as least similar to the real hand). Results show no significant differences between rake and rubber hand distortions but both items were significantly less distorted than the hand. Experiment 2 and 3 explored the role of memory in spatial distance judgments of the hand, the rake and the rubber hand. Spatial representations of items measured in experiment 2 and 3 were also distorted but showed the tendency to be smaller than in localization tasks. While memory and visual similarity seem to contribute to explain qualitative similarities in distortions between the hand and non-corporeal items, those factors cannot explain the larger magnitude observed in hand distortions.

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The effects of instrumental action on perceptual hand maps

Longo

2018

Exp Brain Res

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Perceiving the external spatial location of body parts using position sense requires that immediate proprioceptive afferent signals be integrated with information about body size and shape. Longo and Haggard (Proc Natl Acad Sci 107:11727-11732, 2010) developed a method to measure perceptual hand maps reflecting this metric information about body size and shape. In this paradigm, participants indicate the perceived location of landmarks on their occluded hand by pointing with a long baton held in their other hand. By comparing the relative location of judgments of different hand landmarks, perceptual hand maps can be constructed and compared to actual hand structure. The maps show large and highly stereotyped distortions. Here, I investigated the potential effect of biases related to active motor control of the hand doing the pointing in these distortions. Participants localized the fingertip and knuckle of each finger on their occluded left hand either by actively pointing with a baton held in their right hand (pointing condition) or by giving verbal commands to an experimenter on how to move the baton (verbal condition). Similar distortions were clearly apparent in both conditions, suggesting that they are not an artifact of motor control biases related to the pointing hand.

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Objects exhibit body model like shape distortions

Cited by 43 publications

References 33 publications

Distorted Body Representations in Healthy Cognition

Distorted Body Representations in Healthy Cognition

The role of visual similarity and memory in body model distortions

The effects of instrumental action on perceptual hand maps

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