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Mora L, Committeri G, L'Abbate T, Cocchini G. Unlocking the potential of 'passive' modulation: How sensory stimulation shapes hand and face size. J Neuropsychol 2024. [PMID: 38877675 DOI: 10.1111/jnp.12379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 05/30/2024] [Accepted: 06/03/2024] [Indexed: 06/16/2024]
Abstract
Knowledge of the body size is intricately tied to multisensory integration processes that rely on the dynamic interplay of top-down and bottom-up mechanisms. Recent years have seen the development of passive sensory stimulation protocols aimed at investigating the modulation of various cognitive functions, primarily inducing perceptual learning and behaviour change without the need for extensive training. Given that reductions in sensory input have been associated with alterations in body size perception, it is reasonable to hypothesize that increasing sensory information through passive sensory stimulation could similarly influence the perception of the size of body parts. The primary aim of this study was to investigate the potential modulatory effects of passive sensory stimulation on the perception of hand and face size in a group of young adults. Passive sensory stimulation effectively modulated the size representation of the stimulated hand, supporting the notion that access to somatosensory and proprioceptive information is prioritised for the hands but may not extend to the face. Increased somatosensory input resulted in a reduction of distortion, providing evidence for bottom-up modulation of size representation. Passive sensory stimulation can induce subjective changes in body size perception without the need for extensive training. This paradigm holds promise as a potential alternative for modulating distorted size representation in individuals with body representational deficits.
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Affiliation(s)
- Laura Mora
- Psychology Department, Goldsmiths University of London, London, UK
| | - Giorgia Committeri
- Institute of Advanced Biomedical Technologies, University "G. d'Annunzio", Chieti-Pescara, Italy
| | - Teresa L'Abbate
- Department of Psychology, International Telematic University Uninettuno, Rome, Italy
| | - Gianna Cocchini
- Psychology Department, Goldsmiths University of London, London, UK
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2
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D'Amour S, Alexe D, Harris LR. Changes in the perceived size of the body following exposure to distorted self-body images. ROYAL SOCIETY OPEN SCIENCE 2022; 9:210722. [PMID: 35462776 PMCID: PMC9019518 DOI: 10.1098/rsos.210722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 03/22/2022] [Indexed: 06/14/2023]
Abstract
Inaccurate perceptions, such as under- or over-estimation of body size are often found in clinical eating disorder populations but have recently been shown also in healthy people. However, it is not yet clear how body size perception may be affected when the internal body representation is manipulated. In this study, visual adaptation was used to investigate whether exposure to distorted visual feedback alters the representation of body size and how long any such effects might last. Participants were exposed for five minutes to a distorted life-size image of themselves that was either 20% wider or 20% narrower than their normal size. Accuracy was measured using our novel psychophysical method that taps into the implicit body representation. The accuracy of the representation was assessed at 6, 12 and 18 min following exposure to adaptation. Altered visual feedback caused changes in participants' judgements of their body size: adapting to a wider body resulted in size overestimation whereas underestimations occurred after adapting to a narrower body. These distortions lasted throughout testing and did not fully return back to normal within 18 min. The results are discussed in terms of the emerging literature indicating that the internal representation of the body is dynamic and flexible.
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Affiliation(s)
- Sarah D'Amour
- Centre for Vision Research, York University, Toronto, Canada
| | - Deborah Alexe
- Centre for Vision Research, York University, Toronto, Canada
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3
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Engel MM, Gadsby S, Corcoran AW, Keizer A, Dijkerman HC, Hohwy J. Waiting longer, feeling fatter: Effects of response delay on tactile distance estimation and confidence in females with anorexia nervosa. Brain Behav 2022; 12:e2422. [PMID: 34841723 PMCID: PMC8933789 DOI: 10.1002/brb3.2422] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 09/03/2021] [Accepted: 10/10/2021] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Research suggests that patients with anorexia nervosa (AN) exhibit differences in the perceptual processing of their own bodies. However, some researchers suggest that these differences are better explained with reference to non-perceptual factors, such as demand characteristics or emotional responses to the task. In this study, we investigated whether overestimation of tactile distances in participants with AN results from differences in tactile processing or non-perceptual factors, by measuring the role of allowed response time in an adapted version of the tactile distance estimation task (TDE-D). We further investigated the relationship between allowed response time and participants' confidence in their tactile judgments. METHOD Our sample consisted of females: participants with AN (n = 30), recovered (REC) participants (n = 29) and healthy controls (HC) (n = 31). Participants were asked to estimate tactile distances presented on the skin of either a salient (abdomen) or non-salient (arm) body part, either directly after stimulus presentation (direct condition) or after a 5 s delay (delayed condition). Confidence of estimation accuracy was measured after each response. RESULTS Results showed that allowing AN and REC more time to respond caused them to estimate tactile distances as larger. Additionally, participants with AN became less confident when given more time to respond. CONCLUSIONS These results suggest that non-perceptual influences cause participants with AN to increase their estimates of tactile distances and become less certain of these estimates. We speculate that previous findings-where participants with AN estimate tactile distances as larger than HC-may be due to non-perceptual differences.
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Affiliation(s)
- Manja M Engel
- Dijkermanlab, Department of Experimental Psychology, Faculty of Social and Behavioural Sciences, Heidelberglaan 1, Utrecht, 3584 CS, The Netherlands
| | - Stephen Gadsby
- Cognition and Philosophy Lab, Department of Philosophy, Monash University, 20 Chancellors Walk, Clayton, Victoria, 3800, Australia
| | - Andrew W Corcoran
- Cognition and Philosophy Lab, Department of Philosophy, Monash University, 20 Chancellors Walk, Clayton, Victoria, 3800, Australia
| | - Anouk Keizer
- Dijkermanlab, Department of Experimental Psychology, Faculty of Social and Behavioural Sciences, Heidelberglaan 1, Utrecht, 3584 CS, The Netherlands
| | - H Chris Dijkerman
- Dijkermanlab, Department of Experimental Psychology, Faculty of Social and Behavioural Sciences, Heidelberglaan 1, Utrecht, 3584 CS, The Netherlands
| | - Jakob Hohwy
- Cognition and Philosophy Lab, Department of Philosophy, Monash University, 20 Chancellors Walk, Clayton, Victoria, 3800, Australia
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Longo MR. No evidence for sex differences in tactile distance anisotropy. Exp Brain Res 2022; 240:591-600. [PMID: 34984563 DOI: 10.1007/s00221-021-06301-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 12/23/2021] [Indexed: 11/30/2022]
Abstract
Perceptual illusions of the distance between two touches have been used to study mental representations of the body since E. H. Weber's classic studies in the nineteenth century. For example, on many body parts tactile distance is anisotropic, with distances aligned with body width being perceived as larger than distances aligned with body length on several skin regions. Recent work has demonstrated sex differences in other distortions of mental body representations, such as proprioceptive hand maps. Given such findings, I analysed the results of 24 experiments, conducted by myself and my colleagues, measuring tactile distance anisotropy on the hand dorsum in both women and men. The results showed clear, and highly consistent anisotropy in both women and men, with no evidence for any sex difference.
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Affiliation(s)
- Matthew R Longo
- Department of Psychological Sciences, Birkbeck, University of London, Malet Street, London, WC1E 7HX, UK.
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Mora L, Committeri G, Ciavarro M, Cocchini G. Selective effects of a brain tumor on the metric representation of the hand: a pre- versus post-surgery comparison. Exp Brain Res 2022; 240:3183-3192. [PMID: 36260096 PMCID: PMC9678987 DOI: 10.1007/s00221-022-06475-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 09/30/2022] [Indexed: 01/15/2023]
Abstract
Body representation disorders are complex, varied, striking, and very disabling in most cases. Deficits of body representation have been described after lesions to multimodal and sensorimotor cortical areas. A few studies have reported the effects of tumors on the representation of the body, but little is known about the changes after tumor resection. Moreover, the impact of brain lesions on the hand size representation has been investigated in few clinical cases. Hands are of special importance, as no other body part has the ability for movement and interaction with the environment that the hands have, and we use them for a multitude of daily activities. Studies with clinical population can add further knowledge into the way hands are represented. Here, we report a single case study of a patient (AM) who was an expert bodybuilder and underwent a surgery to remove a glioblastoma in the left posterior prefrontal and precentral cortex at the level of the hand's motor region. Pre- (20 days) and post- (4 months) surgery assessment did not show any motor or cognitive impairments. A hand localization task was used, before and after surgery (12 months), to measure possible changes of the metric representation of his right hand. Results showed a post-surgery modulation of the typically distorted hand representation, with an overall accuracy improvement, especially on width dimension. These findings support the direct involvement of sensorimotor areas in the implicit representation of the body size and its relevance on defining specific size representation dimensions.
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Affiliation(s)
- Laura Mora
- grid.15874.3f0000 0001 2191 6040Psychology Department, Goldsmiths University of London, London, SE14 6NW UK
| | - Giorgia Committeri
- grid.412451.70000 0001 2181 4941Institute of Advanced Biomedical Technologies, University “G. d’Annunzio”, Chieti-Pescara, Italy
| | - Marco Ciavarro
- grid.419543.e0000 0004 1760 3561IRCCS Neuromed, Pozzilli, Italy
| | - Gianna Cocchini
- grid.15874.3f0000 0001 2191 6040Psychology Department, Goldsmiths University of London, London, SE14 6NW UK
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The signing body: extensive sign language practice shapes the size of hands and face. Exp Brain Res 2021; 239:2233-2249. [PMID: 34028597 PMCID: PMC8282562 DOI: 10.1007/s00221-021-06121-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 04/21/2021] [Indexed: 11/20/2022]
Abstract
The representation of the metrics of the hands is distorted, but is susceptible to malleability due to expert dexterity (magicians) and long-term tool use (baseball players). However, it remains unclear whether modulation leads to a stable representation of the hand that is adopted in every circumstance, or whether the modulation is closely linked to the spatial context where the expertise occurs. To this aim, a group of 10 experienced Sign Language (SL) interpreters were recruited to study the selective influence of expertise and space localisation in the metric representation of hands. Experiment 1 explored differences in hands’ size representation between the SL interpreters and 10 age-matched controls in near-reaching (Condition 1) and far-reaching space (Condition 2), using the localisation task. SL interpreters presented reduced hand size in near-reaching condition, with characteristic underestimation of finger lengths, and reduced overestimation of hands and wrists widths in comparison with controls. This difference was lost in far-reaching space, confirming the effect of expertise on hand representations is closely linked to the spatial context where an action is performed. As SL interpreters are also experts in the use of their face with communication purposes, the effects of expertise in the metrics of the face were also studied (Experiment 2). SL interpreters were more accurate than controls, with overall reduction of width overestimation. Overall, expertise modifies the representation of relevant body parts in a specific and context-dependent manner. Hence, different representations of the same body part can coexist simultaneously.
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Longo MR, Holmes M. Distorted perceptual face maps. Acta Psychol (Amst) 2020; 208:103128. [PMID: 32585432 DOI: 10.1016/j.actpsy.2020.103128] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 06/17/2020] [Accepted: 06/17/2020] [Indexed: 11/15/2022] Open
Abstract
Recent research has shown that proprioception relies on distorted representations of body size and shape. By asking participants to localise multiple landmarks in space, perceptual body maps can be constructed. Such maps of the hand and forearm is highly distorted, with large overestimation of limb width compared to length. Here, we investigated perceptual maps of the face, a body part central to our sense of self and personal identity. Participants localised 19 facial landmarks by pointing on a board covering their face. By comparing the relative location of judgments, we constructed perceptual face maps and compared them to actual face structure. These maps were massively distorted, with large overestimation of face width, but not length. This shows that distortions in perceptual body maps are not unique to the hand, but widespread on the body, including parts like the face at the core of our personal identity.
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Affiliation(s)
- Matthew R Longo
- Department of Psychological Sciences, Birkbeck, University of London, United Kingdom.
| | - Marie Holmes
- Department of Psychological Sciences, Birkbeck, University of London, United Kingdom
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D’Amour S, Harris LR. The perceived size of the implicit representation of the dorsum and palm of the hand. PLoS One 2020; 15:e0230624. [PMID: 32203552 PMCID: PMC7089569 DOI: 10.1371/journal.pone.0230624] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 03/04/2020] [Indexed: 12/01/2022] Open
Abstract
The perception of the body and its parts has traditionally been studied using the conscious body image. Here, we determine the implicit representation of the hand. Participants were sequentially shown two life-size images of either the dorsal or palmar surface of their hand. In one interval either the horizontal or vertical dimension of the image was varied using an adaptive staircase, while the other interval contained the full-size, undistorted image. Participants reported which image most closely matched their hand. The staircase honed in on the distorted image that was equally likely to be judged as matching their own hand as the accurate image. The implicit representation was taken as midway between these two images. The experiment was repeated with different hand orientations. Perceived width depended on the orientation, with differences found between the upright and right orientations. Interestingly, the perceived length of the dorsum and palm were different from each other—length of the dorsum was overestimated whereas palm length was perceived accurately. This study reveals distortions of the implicit representation of the hands in healthy individuals.
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Affiliation(s)
- Sarah D’Amour
- Centre for Vision Research, York University, Toronto, Canada
- * E-mail:
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Nazareth ACDP, Escobar VS, DeCastro TG. Body Size Judgments at 17 ms: Evidence From Perceptual and Attitudinal Body Image Indexes. Front Psychol 2020; 10:3018. [PMID: 32010033 PMCID: PMC6978682 DOI: 10.3389/fpsyg.2019.03018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 12/19/2019] [Indexed: 11/13/2022] Open
Abstract
Evidence related to temporal control for stimuli presentation of whole-body image is generally associated with attentional bias to ideal thin bodies. Few studies present evidence concerning whole-body stimuli recognition during fast visual exposure intervals. The aim of this study was to evaluate the accuracy and reaction times for the judgment of different sized body silhouettes presented at 17 ms in a non-clinical sample. Thirty-one participants were divided in attitudinal and perceptual body image groups based on Figure Rating Scale output and performed two experiments. First experiment assessed perception and the clarity of visual experience for human and non-human body stimuli at 17 ms. A general accuracy of 69.17% was registered with no differences between perceptual and attitudinal body image groups. These results indicated that the way participants perceive their own bodies does not influence the recognition of general visual silhouette stimuli. It was also observed that the clarity of visual experience is positively correlated to stimuli recognition accuracy. In the second experiment participants had to respond in a seven-point Likert scale if the presented image of body silhouettes were bigger, equal or thinner than their own bodies. Trials were divided in two blocks based on spatial rotation, half at 0° and half at 180°. General accuracy for body silhouettes recognition was 41.1%. Greater accuracy recognition for regular positioned stimuli was observed. Attitudinal dimension of body image was not a predictor of differential performance whereas perceptual body image groups recorded contrasting recognition performance. Distorted body image participants presented higher accuracy than undistorted body image participants, with greater accuracy to thinner silhouette figures. Women had significantly higher overall accuracy than men considering both experimental blocks. When comparing the cumulative accuracy curves across experimental trials, an exposure effect was registered only for the first experiment. Results showed that body silhouette stimuli were judged in a fast exposure interval with differential accuracy rates only for perceptual body image groups. Such evidence signals that conscious body image can be associated to implicit detection of visual human body stimuli. Future studies should further test how traditional explicit body image outputs perform within experimental approaches.
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Affiliation(s)
- Ana Clara de Paula Nazareth
- Laboratory of Experimental Phenomenology and Cognition, Institute of Psychology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Vinícius Spencer Escobar
- Laboratory of Experimental Phenomenology and Cognition, Institute of Psychology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Thiago Gomes DeCastro
- Laboratory of Experimental Phenomenology and Cognition, Institute of Psychology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
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D'Amour S, Harris LR. The Representation of Body Size: Variations With Viewpoint and Sex. Front Psychol 2020; 10:2805. [PMID: 31920848 PMCID: PMC6929680 DOI: 10.3389/fpsyg.2019.02805] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Accepted: 11/28/2019] [Indexed: 11/22/2022] Open
Abstract
Perceived body size is a fundamental construct that reflects our knowledge of self and is important for all aspects of perception, yet how we perceive our bodies and how the body is represented in the brain is not yet fully understood. In order to understand how the brain perceives and represents the body, we need an objective method that is not vulnerable to affective or cognitive influences. Here, we achieve this by assessing the accuracy of full-body size perception using a novel psychophysical method that taps into the implicit body representation for determining perceived size. Participants were tested with life-size images of their body as seen from different viewpoints with the expectation that greater distortions would occur for unfamiliar views. The Body Shape Questionnaire was also administered. Using a two-alternative forced choice design, participants were sequentially shown two life-size images of their whole body dressed in a standardized tight-fitting outfit seen from the front, side, or back. In one image, the aspect ratio (with the horizontal or vertical dimension fixed) was varied using an adaptive staircase, while the other was undistorted. Participants reported which image most closely matched their own body size. The staircase honed in on the distorted image that was equally likely as the undistorted photo to be judged as matching their perception of themselves. From this, the perceived size of their internal body representation could be calculated. Underestimation of body width was found when the body was viewed from the front or back in both sexes. However, females, but not males, overestimated their width when the body was viewed from the side. Height was perceived accurately in all views. These findings reveal distortions in perceived size for healthy populations and show that both viewpoint and sex matter for the implicit body representation. Though the back view of one’s body is rarely–if ever–seen, perceptual distortions were the same as for the front view. This provides insight into how the brain might construct its representation of three-dimensional body shape.
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Affiliation(s)
- Sarah D'Amour
- Department of Psychology, Centre for Vision Research, York University, Toronto, ON, Canada
| | - Laurence R Harris
- Department of Psychology, Centre for Vision Research, York University, Toronto, ON, Canada
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12
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Abstract
Our body is a volumetric, three-dimensional (3-D) object in the world, and we experience it as such. Existing methods for measuring the perceptual body image, however, have been based on judgments of one-dimensional (1-D) length or two-dimensional images. We developed a new approach to the 3-D perceptual body image of the fingers by asking people to judge whether each finger would fit through rings of varying diameter. This task requires participants to conceptualize their finger as a volumetric object entering the ring. In two experiments, we used an adaptive staircase procedure to estimate the perceived size of each finger. There were systematic distortions of perceived 3-D finger size, with the size of index finger and (to a lesser extent) the middle finger underestimated. These distortions were unaffected by changes in hand posture. Notably, the pattern of distortions is qualitatively different from that found in previous research investigating 1-D finger length, suggesting that 3-D judgments of the body may differ in fundamental ways from 1-D judgments of individual body dimensions.
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Affiliation(s)
- Ebru Ecem Tavacioglu
- Department of Psychological Sciences, Birkbeck, University of London, UK; Department of Psychology, Ludwig-Maximilians-Universität Munchen, Munich, Germany; Psychology Department, Istanbul Sehir University, Turkey
| | - Elena Azañón
- Department of Psychological Sciences, Birkbeck, University of London, UK; Institute of Psychology, Otto von Guericke University Magdeburg, Germany; Center for Behavioral Brain Sciences, Otto von Guericke University Magdeburg, Germany; Department of Behavioral Neurology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Matthew R Longo
- Department of Psychological Sciences, Birkbeck, University of London, UK
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Tamè L, Azañón E, Longo MR. A Conceptual Model of Tactile Processing across Body Features of Size, Shape, Side, and Spatial Location. Front Psychol 2019; 10:291. [PMID: 30863333 PMCID: PMC6399380 DOI: 10.3389/fpsyg.2019.00291] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 01/29/2019] [Indexed: 11/30/2022] Open
Abstract
The processing of touch depends of multiple factors, such as the properties of the skin and type of receptors stimulated, as well as features related to the actual configuration and shape of the body itself. A large body of research has focused on the effect that the nature of the stimuli has on tactile processing. Less research, however, has focused on features beyond the nature of the touch. In this review, we focus on some features related to the body that have been investigated for less time and in a more fragmented way. These include the symmetrical quality of the two sides of the body, the postural configuration of the body, as well as the size and shape of different body parts. We will describe what we consider three key aspects: (1) how and at which stages tactile information is integrated between different parts and sides of the body; (2) how tactile signals are integrated with online and stored postural configurations of the body, regarded as priors; (3) and how tactile signals are integrated with representations of body size and shape. Here, we describe how these different body dimensions affect integration of tactile information as well as guide motor behavior by integrating them in a single model of tactile processing. We review a wide range of neuropsychological, neuroimaging, and neurophysiological data and suggest a revised model of tactile integration on the basis of the one proposed previously by Longo et al.
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Affiliation(s)
- Luigi Tamè
- Department of Psychological Sciences, Birkbeck University of London, London, United Kingdom.,School of Psychology, University of Kent, Canterbury, United Kingdom
| | - Elena Azañón
- Institute of Psychology, Otto von Guericke University Magdeburg, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany.,Department of Behavioral Neurology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Matthew R Longo
- Department of Psychological Sciences, Birkbeck University of London, London, United Kingdom
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Conceptual distortions of hand structure are robust to changes in stimulus information. Conscious Cogn 2018; 61:107-116. [DOI: 10.1016/j.concog.2018.01.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 11/10/2017] [Accepted: 01/08/2018] [Indexed: 12/18/2022]
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