Mapping the Invisible Hand

Longo, Matthew R.; Long, C.; Haggard, Patrick

doi:10.1177/0956797612441219

Cited by 45 publications

(25 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies using the localization task (Longo, 2014;, 2012bLongo et al, 2012) have shown large distortions of the implicit body representation of the hand, including: (1) overall underestimation of finger length, (2) a radial-ulnar gradient with underestimation increasing from the thumb to the little finger, and (3) overestimation of hand width. All of these biases were apparent in the present study in both the apparent and objective conditions.…”

Section: Resultsmentioning

confidence: 99%

“…Distorted maps of the hand are present also when participants have both visual and proprioceptive feedback about the location of their responses , when they have only proprioceptive feedback (Longo, 2014), and when they have only visual feedback (Longo et al, 2012). In addition, distortions persist even when individuals estimate the dimensions of their hands under magnification .…”

Section: Discussionmentioning

confidence: 98%

“…Procedures for this task were similar to those we have used previously (Longo, 2014;, 2012bLongo et al, 2012). Participants placed their left hand palmdown on a table, aligned with their body midline, the hand flat and fingers straight.…”

Section: Methodsmentioning

confidence: 99%

“…These maps were drastically distorted, in a highly consistent manner across individuals. Specifically, across a number of studies, three characteristic patterns of distortions are apparent: underestimation of finger length (i.e., the distance between the knuckles and tip of the fingers), overestimation of the hand width (i.e., distance between pairs of knuckles), and a radio-ulnar gradient with underestimation of finger length increasing systematically from the thumb to the little finger (Ferrè, Vagnoni, & Haggard, 2013;Longo, 2014;, 2012a, 2012bLongo, Long, & Haggard, 2012;Lopez, Schreyer, Preuss, & Mast, 2012;Mattioni & Longo, 2014).…”

Section: Distorted Body Representations In Healthy Adultsmentioning

confidence: 99%

“…They found that participants showed systematic distortions in the perception of bodily proportions that were a function of each body part's relative tactile sensitivity and physical size. Finally, Longo and Haggard (2012) used a visual comparison task to obtain estimates of perceived finger length. They found clear underestimation of finger length analogous to those they had previously found for position sense , though smaller in magnitude.…”

Section: Distorted Body Representations In Healthy Adultsmentioning

confidence: 99%

See 4 more Smart Citations

Distorted body representations are robust to differences in experimental instructions

Tamè

Bumpus

Linkenauger

et al. 2017

Atten Percept Psychophys

Self Cite

View full text Add to dashboard Cite

Several recent reports have shown that even healthy adults maintain highly distorted representations of the size and shape of their body. These distortions have been shown to be highly consistent across different study designs and dependent measures. However, previous studies have found that visual judgments of size can be modulated by the experimental instructions used, for example, by asking for judgments of the participant's subjective experience of stimulus size (i.e., apparent instructions) versus judgments of actual stimulus properties (i.e., objective instructions).Previous studies investigating internal body representations have relied exclusively on 'apparent' instructions. Here, we investigated whether apparent versus objective instructions modulate findings of distorted body representations underlying position sense (Exp. 1), tactile distance perception (Exp. 2), as well as the conscious body image (Exp. 3). Our results replicate the characteristic distortions previously reported for each of these tasks and further show that these distortions are not affected by instruction type (i.e., apparent vs. objective). These results show that the distortions measured with these paradigms are robust to differences in instructions and do not reflect a dissociation between perception and belief.3

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Distorted Body Representations In Healthy Adultsmentioning

confidence: 99%

Section: Distorted Body Representations In Healthy Adultsmentioning

confidence: 99%

See 3 more Smart Citations

Distorted body representations are robust to differences in experimental instructions

Tamè

Bumpus

Linkenauger

et al. 2017

Atten Percept Psychophys

Self Cite

View full text Add to dashboard Cite

show abstract

Somatosensory cortical representation of the body size

Giurgola

Pisoni

Maravita

et al. 2019

Human Brain Mapping

View full text Add to dashboard Cite

The knowledge of the size of our own body parts is essential for accurately moving in space and efficiently interact with objects. A distorted perceptual representation of the body size often represents a core diagnostic criterion for some psychopathological conditions. The metric representation of the body was shown to depend on somatosensory afferences: local deafferentation indeed causes a perceptual distortion of the size of the anesthetized body part. A specular effect can be induced by altering the cortical map of body parts in the primary somatosensory cortex. Indeed, the present study demonstrates, in healthy adult participants, that repetitive Transcranial Magnetic Stimulation to the somatosensory cortical map of the hand in both hemispheres causes a perceptual distortion (i.e., an overestimation) of the size of the participants' own hand (Experiments 1–3), which does not involve other body parts (i.e., the foot, Experiment 2). Instead, the stimulation of the inferior parietal lobule of both hemispheres does not affect the perception of the own body size (Experiment 4). These results highlight the role of the primary somatosensory cortex in the building up and updating of the metric of body parts: somatosensory cortical activity not only shapes our somatosensation, it also affects how we perceive the dimension of our body.

show abstract

Body Representation and Neuroprosthetics

Hagura

Haggard

2014

Clinical Systems Neuroscience

View full text Add to dashboard Cite

Mapping the Invisible Hand

Cited by 45 publications

References 11 publications

Distorted body representations are robust to differences in experimental instructions

Distorted body representations are robust to differences in experimental instructions

Somatosensory cortical representation of the body size

Body Representation and Neuroprosthetics

Contact Info

Product

Resources

About