Representation Of Body Research Articles

Aging, not Parkinson’s disease, decreases a recalibration of body ownership caused by vision-respiratory interaction

IntroductionRecalibration of body ownership perception occurs through an integration among multiple modalities. A recent study has shown that respiratory rhythm also causes the recalibration of ownership perception. However, the risk factors influencing the recalibration of ownership perception caused by vision-respiratory interaction remain unclear. In this study, focusing on aging and Parkinson’s disease (PD), we examined the effects of those risk factors on the recalibration.MethodsBy applying the rubber hand illusion (RHI), which temporarily alters ownership perception, and using a device that synchronizes the respiratory rhythm with the movement of a mannequin hand, we measured a change in ownership perception in RHI training by vision-respiratory interaction. The changed ownership was compared among the elderly healthy, PD, and young healthy groups.ResultsThe results showed no difference in the changed ownership between the elderly healthy and PD groups, while the two groups decreased the change in the ownership perception compared to the young healthy group.DiscussionThe finding suggests that aging, not PD, related to the recalibration of ownership perception by vision-respiratory interaction. An anomaly in body perception due to aging may be associated with a mechanism in which respiratory rhythm affects the adaptation of body representations.

EXPRESS: Disgust drivers do not impact on the altered body in action representation in anorexia nervosa.

Disgust is a powerful emotion, that evolved to protect us from contamination and diseases; it also cores to very human feelings, such as shame. In anorexia nervosa, most of the knowledge on disgust regards food. However, disgust can be elicited by varied drivers, including body-related self-disgust, which may be more central to this condition. Here, we investigate in depth how disgust triggers related to the body influence altered representations in anorexia nervosa.Women with anorexia nervosa and healthy women performed the Hand Laterality Task, in which they were asked to judge the laterality of hands without and with a disgust charging feature (i.e. with a body product or with a body violation). We computed accuracy and reaction time for the effect of biomechanical constraints, an index of motor imagery. We also measured the general disgust sensitivity through a self-report questionnaire.Participants with anorexia nervosa were overall less accurate and slower compared to controls, suggesting a non-canonical (i.e. not based on motor imagery) approach to solving the task. However, they showed the same pattern of responses as controls for disgust-charged stimuli, despite reporting higher levels of disgust sensitivity.Our results suggested the absence of specific effects of disgust drivers on the (altered) body in action representation in anorexia nervosa. We discuss this evidence focusing on the role of the psychopathological symptoms characterizing anorexia nervosa. We also reflect on the efficacy of experimental methodologies used to detect alterations in body representation in this clinical condition.

Visual experience shapes bodily representation of emotion.

Philosophers and experimentalists have long debated whether bodily representation of emotion is grounded in our sensory experience. Indeed, we are used to observe emotional reactions expressed through the bodies of others, yet it is still unknown whether this observation influences how we experience affective states in our own bodies. To delve into this question, we developed a naturalistic haptic task and asked a group of early (n = 20) and late (n = 20) blind, as well as sighted individuals (n = 20) to indicate where in the body they perceive changes associated with affective states. Our results show that visual experience shapes bodily representation of emotion. Blind and sighted individuals attribute different importance to body regions in relation to specific emotional states, as sighted people focus more on visceral sensations, while blind report as more relevant the mouth and the hand areas. We also observe differences in the coherence of bodily maps of specific emotions, such as aggressiveness, for which early and late blind are homogenous in reporting the mouth, while sighted subjects demonstrate a scattered pattern of activation across the body. Finally, our findings show that blind people rely on a different organization of affect, as only sighted categorize bodily maps of emotion through the valence and arousal dimensions. In summary, we demonstrate that sensory experience impacts the bodily representation of affect by modulating the relevance that different body parts have in emotional reactions, modifying the weights attributed to interoceptive and exteroceptive signals, and changing how emotions are conceptualized in the body. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Innovative Digital Phenotyping Method to Assess Body Representations in Autistic Adults: A Perspective on Multisensor Evaluation.

In this perspective paper, we propose a novel tech-driven method to evaluate body representations (BRs) in autistic individuals. Our goal is to deepen understanding of this complex condition by gaining continuous and real-time insights through digital phenotyping into the behavior of autistic adults. Our innovative method combines cross-sectional and longitudinal data gathering techniques to investigate and identify digital phenotypes related to BRs in autistic adults, diverging from traditional approaches. We incorporate ecological momentary assessment and time series data to capture the dynamic nature of real-life events for these individuals. Statistical techniques, including multivariate regression, time series analysis, and machine learning algorithms, offer a detailed comprehension of the complex elements that influence BRs. Ethical considerations and participant involvement in the development of this method are emphasized, while challenges, such as varying technological adoption rates and usability concerns, are acknowledged. This innovative method not only introduces a novel vision for evaluating BRs but also shows promise in integrating traditional and dynamic assessment approaches, fostering a more supportive atmosphere for autistic individuals during assessments compared to conventional methods.

Supplemental Material for Visual Experience Shapes Bodily Representation of Emotion

Supplemental Material for Visual Experience Shapes Bodily Representation of Emotion

American Arcadia? The Shift of the Homoerotic Gaze in Herbert List’s Work

The German photographer Herbert List (1903–75) is well known for his pictures from the Mediterranean, metaphysical still lives and portraits of young men. The latter, in particular, have garnered continuous attention due to their beauty and as examples of homosexual aesthetics in prewar and postwar Europe. A lesser-known body of work are his photographs taken in the Caribbean in 1957, including portraits of Black men. This article sheds light on List’s different homoerotic images by situating them in their art historical as well as local context. First, in an analysis of his Oriental and Orientalist representations of young men in Tunisia, I delineate his expansion of classical Greco-Roman tropes. Second, I contrast these images with List’s portraits of people of colour in the Caribbean and his critique of their historical exploitation and current living situation. In both contexts, List is complicit with as well as in contradiction to the power dynamics of European imperialism, and both follows and digresses from white European visual traditions. This analysis expands current scholarship by taking into consideration the issues of race, class and postcolonialism and their impact on the representation of bodies of colour.

Lack of visual experience leads to severe distortions in the hand representation of the body model

This study investigates the impact of vision on the maintenance of hand representation in the implicit body model, particularly focusing on congenitally blind individuals. To address this, we performed a hand landmark localization task on blind individuals who lacked visual experience of their bodies and compared their performance to normally sighted and normally sighted but blindfolded participants. Through measurements of finger lengths, hand width, and shape index, we demonstrate that blind participants exhibit significantly greater distortions in their hand representation compared to sighted and blindfolded controls. Notably, blind individuals displayed a marked overestimation of hand width and an underestimation of finger lengths, particularly in digits D2, D3, and D4. Surprisingly, blind subjects with partial vision displayed more severe distortions than those with no residual vision. Furthermore, our findings reveal that late-blind participants exhibit similar levels of distortion as congenitally blind individuals, suggesting an extended period of susceptibility to the lack of visual input in shaping body representations. The Reverse Distortion (RD) hypothesis provides a plausible explanation for these distortions, suggesting that compensatory mechanisms occur within the body model to counteract the anisotropic cortical representations. Our results support this hypothesis: blind individuals have expanded cortical representations processing tactile information, so this could lead to more pronounced distortions in their hand representation of the body model. This underscores the importance of visual input in modulating body representations. Overall, our study highlights the malleability of body representations and the intricate interplay between sensory inputs and cortical processing in shaping the implicit body model.

The Female Body and the Body Politic in Sex Scenes of Lou Ye’s Film: A Multimodal Discourse Analysis of <i>Summer Palace</i>

This article discusses the body politic of Yu Hong in the postsocialist Chinese film–Summer Palace (2006). Director Lou Ye places Yu Hong’s body in the sex scenes that metaphorically expresses a traumatic and sensitive political event, the “June Fourth Incident.” The portrayal of sexual intercourse, nudity, and this historical event is the unspeakable “secret” in mainland Chinese media. Therefore, the authors raise the question that, when sexual intercourse and the female body enter political discourse, how do we deal with the complex and dynamic power structures behind bodily attributes and the “anachronistic” historical objects that do not fit into the mainstream narrative and epistemological spaces? Drawing on body politic theory, feminist film theory, and a semiotic framework, we adopt multimodal critical discourse analysis to assess power relations and ideologies behind Yu’s body attributes in the sex scenes. The findings indicate that Lou constructs a complex communication system, using her body as a carrier of communication to express self-consciousness, constructing female subjectivity through the writing of feminine discourse, with the political purpose of seeking the freedom of the written word. Sexual liberation is sought by establishing a transgressive body that is not accepted by the mainstream and opposes the inherent power of government. Yu’s bodily pleasure is set up as an expression of narcissistic individualism through love, producing a vision of political ecstasy. Her melancholy body metaphor for the discomfort and confusion that preceded the student movement and the post-traumatic ambivalence. Using the female body as a site of political discourse and sexual liberation offers a new reading strategy for analysing the representation of the female body in film and other forms of media. In making the argument, the study contributes valuable scholarship to the film studies focused on sexual, gender, and political marginalised discourse.

Eyes and hand are both reliable at localizing somatosensory targets.

Body representations (BR) for action are critical to perform accurate movements. Yet, behavioral measures suggest that BR are distorted even in healthy people. However, the upper limb has mostly been used as a probe so far, making difficult to decide whether BR are truly distorted or whether this depends on the effector used as a readout. Here, we aimed to assess in healthy humans the accuracy of the eye and hand effectors in localizing somatosensory targets, to determine whether they may probe BR similarly. Twenty-six participants completed two localization tasks in which they had to localize an unseen target (proprioceptive or tactile) with either their eyes or hand. Linear mixed model revealed in both tasks a larger horizontal (but not vertical) localization error for the ocular than for the manual localization performance. However, despite better hand mean accuracy, manual and ocular localization performance positively correlated to each other in both tasks. Moreover, target position also affected localization performance for both eye and hand responses: accuracy was higher for the more flexed position of the elbow in the proprioceptive task and for the thumb than for the index finger in the tactile task, thus confirming previous results of better performance for the thumb. These findings indicate that the hand seems to beat the eyes along the horizontal axis when localizing somatosensory targets, but the localization patterns revealed by the two effectors seemed to be related and characterized by the same target effect, opening the way to assess BR with the eyes when upper limb motor control is disturbed.

Artificial embodiment displaces cortical neuromagnetic somatosensory responses

Integrating artificial limbs as part of one's body involves complex neuroplastic changes resulting from various sensory inputs. While somatosensory feedback is crucial, plastic processes that enable embodiment remain unknown. We investigated this using somatosensory evoked fields (SEFs) in the primary somatosensory cortex (S1) following the Rubber Hand Illusion (RHI), known to quickly induce artificial limb embodiment. During electrical stimulation of the little finger and thumb, 19 adults underwent neuromagnetic recordings before and after the RHI. We found early SEF displacement, including an illusion-brain correlation between extent of embodiment and specific changes to the first cortical response at 20 ms in Area 3b, within S1. Furthermore, we observed a posteriorly directed displacement at 35 ms towards Area 1, known to be important for visual integration during touch perception. That this second displacement was unrelated to extent of embodiment implies a functional distinction between neuroplastic changes of these components and areas. The earlier shift in Area 3b may shape extent of limb ownership, while subsequent displacement into Area 1 may relate to early visual-tactile integration that initiates embodiment. Here we provide evidence for multiple neuroplastic processes in S1—lasting beyond the illusion—supporting integration of artificial limbs like prostheses within the body representation.

Anatomage virtual dissection versus traditional human body dissection in anatomy pedagogy: insights from Ghanaian medical students

BackgroundAlthough traditional human body dissection has been the mainstay method for gross anatomy pedagogy, the popularity of virtual teaching methods has increased in recent years. The Anatomage table offers a life-size digital representation of the human body and allows visualization, manipulation, and virtual dissection. This study investigated the perception of medical students towards virtual dissection vis-à-vis traditional dissection in anatomy pedagogy.MethodsThe cross-sectional survey included medical students at the University of Ghana who completed an internet-based questionnaire administered using Google® Forms. The questionnaire comprised 20 close-ended questions that solicited information on demographics, experience with traditional human body dissection and virtual dissection, and perception of virtual dissection. Data was summarized as frequencies and percentages with 95% confidence intervals.ResultsOf the 297 participants, 295 [99.4% (95% CI = 97.3–99.9)] participated in human body dissection from which 93.2% had a positive and 6.8% had poor experiences. Whereas 223 [75.1% (95% CI = 69.7–79.8)] of the participants would participate in dissection again given the opportunity, 74 [24.9% (95% CI = 20.2–30.3)] were unwilling. Of 297 participants, 205 [69.0% (95% CI = 69.7–74.2)] had used Anatomage table, while 92 [31.0% (95% CI = 25.8–36.6)] had not. About 68% (95% CI = 60.8–74.0) of the 205 agreed with the relative ease of operation and use of the Anatomage table compared to traditional human body dissection while 9.4% disagreed. Inadequate operational skills [51% (95% CI = 48.9–53.4)] and limited accessibility [39% (95% CI = 35.2–42.3)] were limitations to Anatomage use. 66.8% (95% CI = 59.9–73.1) of participants agreed virtual dissection had a positive influence on learning anatomy while 6.6% disagreed. Of the 205, 87.9% (95% CI = 82.3–91.8) discouraged virtual anatomy dissection completely replacing traditional human body dissection.ConclusionVirtual dissection is an effective supplement to traditional body dissection but not a replacement. Its use alongside traditional methods improves anatomy learning. Integrating technology into anatomy education will enhance student engagement and learning.

Clinical Significance of Pose Estimation Methods Compared with Radiographic Parameters in Adolescent Patients with Idiopathic Scoliosis.

Human pose estimation, a computer vision technique that identifies body parts and constructs human body representations from images and videos, has recently demonstrated high performance through deep learning. However, its potential application in clinical photography remains underexplored. This study aimed to establish photographic parameters for patients with adolescent idiopathic scoliosis (AIS) using pose estimation and to determine correlations between these photographic parameters and corresponding radiographic measures. We conducted a study involving 42 patients with AIS who had undergone spinal correction surgery and conservative treatment. Preoperative photographs were captured using an iPhone 13 Pro mounted on a tripod positioned at the head of an X-ray tube. From the outputs of pose estimation, we derived five photographic parameters and subsequently conducted a statistical analysis to assess their correlations with relevant conventional radiographic parameters. In the sagittal plane, we identified significant correlations between photographic and radiographic parameters measuring trunk tilt angles. In the coronal plane, significant correlations were found between photographic parameters measuring shoulder height and trunk tilt and corresponding radiographic measurements. The results suggest that pose estimation, achievable with common mobile devices, offers potential for AIS screening, early detection, and continuous posture monitoring, effectively mitigating the need for X-ray radiation exposure. Level of Evidence: 3.

A Network Analytic Approach to Dissociation: New Insights from Clinical Data

ABSTRACT The transdiagnostic construct of dissociation, characterized by a disintegration of specific psychological functions such as consciousness, memory, identity, perception, body representation, and behavior, remains elusive to a unified conceptualization. Specifically, its dimensionality is a matter of ongoing controversy. Empirical approaches applying factor analyses to the Dissociative Experiences Scale (DES) have yielded inconsistent findings. This study adopts a novel methodological approach, utilizing Exploratory Graph Analysis (EGA) to address this issue. In a sample of 668 day-hospital patients undergoing psychotherapy for a variety of mental disorders, a Gaussian graphical model was estimated for the 28 items of the DES. Additionally, the stability of the results was ensured by bootstrap procedures. While both the original EGA and the bootstrap EGA suggested four dimensions, the structural consistency of this solution was low due to an instability of 12 items. After excluding 10 of these unstable items, re-analyses again revealed a four-factor structure, but boot EGA indicated that one factor had unsatisfactory structural consistency due to the multidimensionality of its two items. Upon removing these, our final network consisted of 16 items mapping onto 3 dimensions. Our study, using data from a diagnostically heterogeneous sample, replicates and extends previous findings on the dimensionality of dissociation as captured by the DES. The three dimensions identified correspond to segregated processes, derealization/depersonalization, and absorption. This solution aligns with a bipartite model of dissociation with two broader categories referring to either altered states of consciousness (often named detachment) or to non-integrated mental modules (labeled as compartmentalization).

Somatosensory cortex and body representation: Updating the motor system during a visuo-proprioceptive cue conflict.

The brain's representation of hand position is critical for voluntary movement. Representation is multisensory, relying on both visual and proprioceptive cues. When these cues conflict, the brain recalibrates its unimodal estimates, shifting them closer together to compensate. Converging lines of evidence from research in perception, behavior, and neurophysiology suggest that such updates to body representation must be communicated to the motor system to keep hand movements accurate. We hypothesized that primary somatosensory cortex (S1) plays a crucial role in conveying the proprioceptive aspects of the updated body representation to the motor system. We tested this hypothesis in two experiments. We predicted that proprioceptive, but not visual, recalibration would be associated with change in short latency afferent inhibition (SAI), a measure of sensorimotor integration (influence of sensory input on motor output) (Expt. 1). We further predicted that modulating S1 activity with repetitive transcranial magnetic stimulation (TMS) should affect variance and recalibration associated with the proprioceptive estimate of hand position, but have no effect on the visual estimate (Expt. 2). Our results are consistent with these predictions, supporting the idea that (1) S1 is indeed a key region in facilitating motor system updates based on changes in body representation, and (2) this function is mediated by unisensory (proprioceptive) processing, upstream of multisensory visuo-proprioceptive computations. Other aspects of the body representation (visual and multisensory) may be conveyed to the motor system via separate pathways, e.g. from posterior parietal regions to motor cortex.

From neuropsychology to embodied neuroscience: Introduction to the special issue on body representation and body transformations

From neuropsychology to embodied neuroscience: Introduction to the special issue on body representation and body transformations

Characterization of Water Bodies through Hydro-Physical Indices and Anthropogenic Effects in the Eastern Northeast of Brazil

Brazil, despite possessing the largest renewable freshwater reserves in the world (8.65 trillion m3 annually), faces growing challenges in water management due to increasing demand. Agriculture, responsible for 68.4% of water consumption, is one of the main drivers of this demand, especially in the São Francisco River Basin, where irrigation accounts for 81% of total water withdrawals. Water bodies play a crucial role in sustaining ecosystems and supporting life, particularly along the East-West axis of Alagoas, a water-rich region in the ENEB. This study aimed to map and quantify the spatiotemporal variations of water bodies in the ENEB region and assess the impacts of human activities using MODIS satellite data, applying hydrological indices such as NDWI, MNDWI, and AWEI. Between 2003 and 2022, significant variations in the extent of water bodies were observed, with reductions of up to 100 km2 during dry periods and expansions of up to 300 km2 during wet seasons compared to dry periods. AWEI and MNDWI proved to be the most effective indices for detecting water bodies with MODIS data, providing accurate insights into water dynamics. Additionally, the MapBiomas Rios dataset, despite being resampled from a 30 m to a 500 m resolution, offered the most accurate representation of water bodies due to its methodology for data acquisition. Changes in albedo and surface temperature were also detected, highlighting the influence of climate change on the region’s water resources. These findings are crucial for guiding the sustainable management of water resources, not only in Alagoas but also in other regions of Brazil and similar semi-arid areas around the world. The study demonstrates the hydrological variability in the state of Alagoas, indicating the need for adaptive strategies to mitigate the impacts of climate change and anthropogenic pressures, supporting the need for informed decision-making in water resource management at both local and national levels.

To be fit, or not to be: How influencer-driven advertising reinforces idealized beauty standards in adolescents

ABSTRACT This study examines adolescents’ perceptions of body image advertising portrayed by social media influencers. Through discourse analysis, the research explores how participants interpret messages conveyed through influencer advertising content. The analysis reveals a discrepancy between adolescents’ understanding of ideal body representations and the descriptors used in advertising, shedding light on societal pressures surrounding body norms within social media. These findings underscore the pervasive influence of social media and advertising on adolescent body image constructs, highlighting the importance of cultivating critical advertising literacy skills among adolescents. Additionally, the study reveals that influencers affiliated with advertising perpetuate the stereotypical ideals of the body, emphasizing the need for educational and policymaker initiatives to promote healthy self-image.

Unveiling The Corporeal: The Female Body, Subjectivity and Politics of Visibility in Maryam Touzani’s Film Adam

Throughout the history of cinema, the female body has often been a scopic site of pleasure and subjugation. Female filmmakers have long sought to refute the sexist scrutiny of women onscreen and work for healthier cinematic representations of the female body. This article aims to cast light on the different textual and visual tactics and aesthetics employed by the transnational Moroccan filmmaker Mariam Touzani in her film Adam (2020) to de-romanticize women and deconstruct the conventional cinematic framework where the female body is restrained to adhere to the patriarchal ideologies. The female protagonists Samia and Abla reflect the determination of the filmmaker Mariam Touzani to provide an understanding of the female body as an organism full of life, emotions, and agency, rather than an erotic, static icon. In analysing the film, the article embraces a feminist discourse to highlight the multifaceted dimensions of womanhood and contemplate the complexities surrounding the female body. Adam is a feminist firebrand against the alienating conditions of women and the objectification of the female body.

Slim and slender: homoerotic images of young men in the 1980s Thai gay magazines

ABSTRACT This article aims to explain how masculine images of Thai slim and slender young men are constructed as homoerotic and homosexual desires focusing on the first generation of commercial gay magazines in the 1980s. Questioning the role of media in the formation of Thai gay culture, the paper explores the connection between consumer culture and the emergence of the modern Thai gay community during the 1980s. Not only do the text/articles in Thai gay magazines tell us about Thai gay culture and history, but the images of men whose photographs appear in Thai magazines also tell us much about the culture of masculinity in Thailand. Thai urban gay people perceived this masculine image and used it to achieve and sustain their sexual imagination. The article demonstrates the representation of male slim and slender bodies in specific social and cultural contexts, which Thai gay men had gradually learned about homoeroticism. It has been found that the homosexual attraction to the slim body image of Thai young men is culturally different from the Western paradigm of big-body gay clones involved in Western gay culture magazines. It could be noted that the cultural and social context behind these homoerotic relations is the changing way of presenting the masculine body of the Thai gay community.

Attachment and body representations in adolescents with personality disorder.

Attachment theory has served as an influential framework for understanding psychopathology, partly due to reliable assessment methodology. The influence of insecure attachment on attitudes towardthe body and the impact this might have for the development of psychopathology is however less well elucidated. A total of 123 adolescents (35 with borderline personality disorder or BPD, 25 with other personality disorders [OPD]and 63 comprising a normative control group) were interviewed with the Adult Attachment Interview (AAI) and the Mirror Interview (MI). The MI questions respondents about how they feel about their bodies, as they look in the mirror. The AAIs from the Borderline group were predominantly insecure-preoccupied and unresolved. These adolescents had significantly lower levels of a positive and integrated sense of self and body than the other groups. Regression results revealed a high loving relationship with fathers, low involving anger with father, high coherence of mind, slight derogation of mother &low levels of unresolved loss uniquely and additively predicted 55% of variance in the summary score assigned to MIresponses, that is,the summary score for a Positive and Integrated Body Representation (PIBR). Unfavorable attachment experiences and current states of mind regarding attachment may give rise to problems with establishing PIBRs, and thus play a role in the development of psychopathology, especially BPD.