An implicit body representation underlying human position sense

Longo, Matthew R.; Haggard, Patrick

doi:10.1073/pnas.1003483107

Cited by 309 publications

(478 citation statements)

References 34 publications

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“…Intriguingly, 1 these maps showed several large and stereotyped biases, including an overall overestimation of 2 hand width and an overall underestimation of finger length. Longo and Haggard (2010) interpreted 3 these results as evidence for perceptual distortions of the metric properties of the body. The present 4 finding that participants explicitly judge their knuckles as being more distal on the hand than they 5 actually are suggests that the underestimation of finger length found in their localisation task may 6 reflect a conceptual misunderstanding of hand configuration, rather a perceptual distortion of finger 7 length.…”

Section: Materials and Procedures 23mentioning

confidence: 96%

Visual detail about the body modulates tactile localisation biases

Margolis

Longo

2014

Exp Brain Res

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1The localisation of tactile stimuli requires the integration of visual and somatosensory inputs within 2 an internal representation of the body surface, and is prone to consistent bias. Joints may play a role 3 in segmenting such internal body representations, and may therefore influence tactile localisation 4 biases, although the nature of this influence remains unclear. Here, we investigate the relationship 5 between conceptual knowledge of joint locations and tactile localisation biases on the hand. In one 6 task, participants localised tactile stimuli applied to the dorsum of their hand. A distal localisation 7 bias was observed in all participants, consistent with previous results. We also manipulated the 8 availability of visual information during this task, to determine whether the absence of this 9 information could account for the distal bias observed here and by Mancini and colleagues (2011). 10The observed distal bias increased in magnitude when visual information was restricted, without a 11 corresponding decrease in precision. In a separate task, the same participants indicated, from 12 memory, knuckle locations on a silhouette image of their hand. Analogous distal biases were also 13 seen in the knuckle localisation task. The accuracy of conceptual joint knowledge was not 14 correlated with tactile localisation bias magnitude, although a similarity in observed bias direction 15 suggests that both tasks may rely on a common, higher-order body representation. These results also 16 suggest that distortions of conceptual body representation may be more common in healthy 17 individuals than previously thought. 18 19

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Section: Materials and Procedures 23mentioning

confidence: 96%

Visual detail about the body modulates tactile localisation biases

Margolis

Longo

2014

Exp Brain Res

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“…These maps show massive distortions, which are highly stereotyped across people, for example, overall underestimation of finger length and overestimation of hand width. Longo and Haggard (2010) interpreted this result as suggesting that immediate proprioceptive signals are combined with a distorted mental representation of body size and shape, which they called the body model. This task is unusually suited to studies of mental imagery in that The Body and Proprioceptive Imagery 5 it does not require any stimulation to be delivered to the judged body part, or even for that part to exist at all.…”

Section: Introductionmentioning

confidence: 99%

“…We employed a paradigm we recently developed to construct perceptual maps of hand size and shape underlying proprioception (Longo & Haggard, 2010). Participants use a long baton to indicate the perceived location of landmarks (i.e., fingertips and knuckles) of their occluded hand.…”

Section: Introductionmentioning

confidence: 99%

“…In Experiment 1, we used the pointing task developed by Longo and Haggard (2010) to construct perceptual hand maps both when the hand was on table, underneath the occluding board (real condition), and when the participant merely imagined the hand as being there (imagined condition). Based on previous imagery research, which has found that imagery preserves metric relations, we predicted the same stereotyped pattern of distortions (i.e., an underestimation of finger length and overestimation of knuckle spacing) in both conditions.…”

Section: Introductionmentioning

confidence: 99%

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Projecting the self outside the body: Body representations underlying proprioceptive imagery

Ganea

Longo

2017

Cognition

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Recent research has shown that proprioception relies on distorted representations of body size and shape. By asking participants to localise multiple landmarks on their occluded hand, perceptual maps of hand size and shape can be constructed and compared to actual hand structure. These maps are different from the actual size and shape of the occluded hand, revealing underestimation of finger length and overestimation of hand width. Here we tested whether the same distorted body model underlies proprioceptive imagery (i.e. imagining the hand at a specific location, and in a different posture than it actually is). In Experiment 1, participants placed their left hand under an occluding board (real condition) or imagined their left hand under the board (imagined condition). Highly similar distortions were found in both conditions. Furthermore, results across the two conditions were strongly correlated. In Experiment 2, participants completed the real condition and two imagined conditions. In the imagined-fist condition, participants held their left hand in a fist, in their lap, while in the imagined-flat condition, participants held their left hand flat, with palm down, in their lap. In both imagined conditions, participants were asked to imagine their left hand lying flat, with palm down, under the occluding board. A similar pattern of distortions was found in all three conditions. These results suggest that both proprioception and proprioceptive imagery reply on a common stored model of the body's metric properties.The Body and Proprioceptive Imagery 3

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“…Humans often have a distorted perception of their posture, position, body size, or body shape [2][3][4] . Divergence between the perceived and the actual body is a possible reason for worse performance in athletes.…”

Section: Introductionmentioning

confidence: 99%

The role of sensory signals in perception of the body

Sakamoto

2017

JPFSM

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Humans perceive their body posture, size, and position in space even when they do not look at their body. The ability to perceive the body correctly is essential to move accurately in space. The purpose of this review is to introduce the reader to the latest views on the role of peripheral afferent signals in the generation and alteration of perception of the body. First, the contribution of proprioceptive and cutaneous signals to perception of the body is introduced. Common methods to investigate these signals are muscle vibration, skin stretch, or electrical stimulation. These methods provide evidence that the perception of the body is flexible. Second, effects of multisensory integration on perception of the body are described. The combination of visual, tactile, proprioceptive, and auditory signals alter the perception of the body, suggesting that multiple sensory signals contribute to perception of the body. Third, the distortion of perception of the body after the loss of sensory signals is reviewed. Anesthesia or amputation of limbs, as well as experimentally-induced disintegration of sensory signals drastically alter the perception of the body. Fourth, neural mechanisms underlying the generation, or alteration, of perception of the body is described. The premotor and parietal cortices play a key role in perception of the body, as they are involved in multisensory integration. In the final section of the review, implications of the ways sensory information shapes perception of our body are discussed for athletic performance.

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An implicit body representation underlying human position sense

Cited by 309 publications

References 34 publications

Visual detail about the body modulates tactile localisation biases

Visual detail about the body modulates tactile localisation biases

Projecting the self outside the body: Body representations underlying proprioceptive imagery

The role of sensory signals in perception of the body

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