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1.
Toxicon ; 204: 37-43, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34756918

RESUMO

Adults of the ectoparasitic copepod Caligus fugu found on tetrodotoxin (TTX)-bearing pufferfish such as Takifugu alboplumbeus and Takifugu flavipterus are known to accumulate TTX in body tissues and parts other than the ovaries, oviducts, eggs, and cuticles. This study aimed to demonstrate, using immunoenzymatic staining techniques, that the TTX-free planktonic/infective copepodid stage of C. fugu could accumulate TTX in the tissues after molting into the parasitic stage (chalimus I) and then fed on mucus of host puffers. All the tissues of the planktonic copepodids were completely TTX-free, whereas chalimus I copepods accumulated TTX in parts other than the cuticles, guts, and some muscles. Chalimus IV and adult copepods retained TTX in these body parts but not in the reproductive organs, which were TTX-resistant, indicating that TTX was not vertically transmitted via eggs. Non-cellular TTX-positive contents found in the guts of some chalimi and adults indicated that the copepods potentially accumulated TTX by feeding on host mucus rather than skin tissues and blood. This study revealed that the presence or absence of TTX in some body parts differed among individuals of the parasite.


Assuntos
Copépodes , Parasitos , Animais , Feminino , Corpo Humano , Humanos , Muco , Takifugu , Tetrodotoxina
2.
Artigo em Chinês | MEDLINE | ID: mdl-34672460

RESUMO

Objective: The arterial blood with the oscillatory information comes from the right heart system after gas exchanging in the lung. However, the evidence of the waveform of venous ABG is lack. The objectives of this article are to compare the different information between arterial and venous beat-by-beat blood sample at the same time. Methods: Six post-operative patients with normal heart function and negative Allen test, had been placed the arterial catheterization and central venous catheterization directly connected to pre-heparin plasticpipes for continuous collecting arterial and venous blood. We twisted the 2 pipes into helix formation. After drawing arterial and venous blood with syringes in one heart beat with one helix at the same time, totally 15 heart beats, clipping the pipes with forceps, we put the helix pipe into icedwater at once and analyses PaO2, PaCO2, pH and SaO2 as soon as possible. We selected two breathscycles of waveform from each patient for data calculations of magnitudes and time interval. Results: The heart beat numbers for drawing blood into pipe were 15~16, and all covered more than 2 breathing cycles. There were significant changes of arterial PaO2(i.e. the highest high values compare to the next lowestvalues, P<0.05), but no significant changes in venous blood(P>0.05). The magnitudes of changing PaO2 in arterial and venous blood sample were (9.96±5.18)mmHg and (1.63±0.41)mmHg with significant variance(P=0.010), and they were (8.09±2.43)% and (3.91±1.22)%from their mean with significant variance(P=0.009) respectively. Conclusion: With continuous beat-by-beat arterial and venous blood sampling and ABG analyzing method at the same time, we obtain a clear evidence of periodic parameters ABG waveform, which following breathing cycle, but no clear ABG waveform of the periodic parameters in the venous blood samples, which implies the oscillatory information of the arterial blood with comes from the gas exchanging in the lung.


Assuntos
Artérias , Corpo Humano , Gasometria , Humanos , Respiração , Veias
3.
Sensors (Basel) ; 21(19)2021 Sep 27.
Artigo em Inglês | MEDLINE | ID: mdl-34640774

RESUMO

In this paper, comprehensive mPoint, a method for generating 3D (range, azimuth, and elevation) point cloud of human targets using a Frequency-Modulated Continuous Wave (FMCW) signal and Multi-Input Multi-Output (MIMO) millimeter wave radar is proposed. Distinct from the TI-mPoint method proposed by TI technology, a comprehensive mPoint method considering both the static and dynamic characteristics of radar reflected signals is utilized to generate a high precision point cloud, resulting in more comprehensive information of the target being detected. The radar possessing 60-64 GHz FMCW signal with two sets of different dimensional antennas is utilized in order to experimentally verify the results of the methodology. By using the proposed process, the point cloud data of human targets can be obtained based on six different postures of the underlying human body. The human posture cube and point cloud accuracy rates are defined in the paper in order to quantitively and qualitatively evaluate the quality of the generated point cloud. Benefitting from the proposed comprehensive mPoint, evidence shows that the point number and the accuracy rate of the generated point cloud compared with those from the popular TI-mPoint can be largely increased by 86% and 42%, respectively. In addition, the noise level of multipath reflection can be effectively reduced. Moreover, the length of the algorithm running time is only 1.6% longer than that of the previous method as a slight tradeoff.


Assuntos
Corpo Humano , Radar , Algoritmos , Humanos
4.
Sensors (Basel) ; 21(19)2021 Oct 02.
Artigo em Inglês | MEDLINE | ID: mdl-34640910

RESUMO

This paper presents some considerations on the design of a novel antenna consisting of the combination of a transverse stubs (TS) array excited by Ridge Gap Waveguides (RGWs), as well as a discussion of the experimental results obtained from a prototype that was manufactured and measured. A combination of Continuous Transverse Stubs (CTSs) is used as the starting point. Subsequently, the CTSs are modified to include some metallic blockers that split each CTS into a combination (array) of shorter TSs. This is performed in order to excite each individual TS column using a different RGW; thus, ensuring a close to uniform field distribution in the transverse plane of the TS arrays. Hence, the directivity of the antenna is increased. As a series-feed configuration is considered, the antenna keeps a resonant behaviour, having a narrow-band response. A Corporate Feeding Network (CFN) using the aforementioned RGW technology placed in the same layer as the rest of the antenna is included in the design. The radiating area of the antenna is, finally, 5.88λ0×7.12λ0 with a simulated peak gain of 26.2 dBi and a Side Lobe Level (SLL) below -13 dB. A prototype is manufactured and tested. The simulated and measured radiation patterns maintain similar shapes to those of the simulations, with very similar angular widths in both main planes, although the frequency corresponding to the highest directivity changes to 31.8 GHz. A matching bandwidth of 517 MHz and a gain of 24.5 is, finally, achieved at that frequency.


Assuntos
Tecnologia , Tecnologia sem Fio , Desenho de Equipamento , Corpo Humano
5.
Sensors (Basel) ; 21(19)2021 Oct 06.
Artigo em Inglês | MEDLINE | ID: mdl-34640961

RESUMO

Recent studies confirm the applicability of Inertial Measurement Unit (IMU)-based systems for human motion analysis. Notwithstanding, high-end IMU-based commercial solutions are yet too expensive and complex to democratize their use among a wide range of potential users. Less featured entry-level commercial solutions are being introduced in the market, trying to fill this gap, but still present some limitations that need to be overcome. At the same time, there is a growing number of scientific papers using not commercial, but custom do-it-yourself IMU-based systems in medical and sports applications. Even though these solutions can help to popularize the use of this technology, they have more limited features and the description on how to design and build them from scratch is yet too scarce in the literature. The aim of this work is two-fold: (1) Proving the feasibility of building an affordable custom solution aimed at simultaneous multiple body parts orientation tracking; while providing a detailed bottom-up description of the required hardware, tools, and mathematical operations to estimate and represent 3D movement in real-time. (2) Showing how the introduction of a custom 2.4 GHz communication protocol including a channel hopping strategy can address some of the current communication limitations of entry-level commercial solutions. The proposed system can be used for wireless real-time human body parts orientation tracking with up to 10 custom sensors, at least at 50 Hz. In addition, it provides a more reliable motion data acquisition in Bluetooth and Wi-Fi crowded environments, where the use of entry-level commercial solutions might be unfeasible. This system can be used as a groundwork for developing affordable human motion analysis solutions that do not require an accurate kinematic analysis.


Assuntos
Corpo Humano , Dispositivos Eletrônicos Vestíveis , Fenômenos Biomecânicos , Humanos , Movimento (Física) , Movimento
6.
BMC Musculoskelet Disord ; 22(1): 849, 2021 Oct 05.
Artigo em Inglês | MEDLINE | ID: mdl-34610804

RESUMO

BACKGROUND: For optimal prosthetic anchoring in omarthritis surgery, a differentiated knowledge on the mineralisation distribution of the glenoid is important. However, database on the mineralisation of diseased joints and potential relations with glenoid angles is limited. METHODS: Shoulder specimens from ten female and nine male body donors with an average age of 81.5 years were investigated. Using 3D-CT-multiplanar reconstruction, glenoid inclination and retroversion angles were measured, and osteoarthritis signs graded. Computed Tomography-Osteoabsorptiometry (CT-OAM) is an established method to determine the subchondral bone plate mineralisation, which has been demonstrated to serve as marker for the long-term loading history of joints. Based on mineralisation distribution mappings of healthy shoulder specimens, physiological and different CT-OAM patterns were compared with glenoid angles. RESULTS: Osteoarthritis grades were 0-I in 52.6% of the 3D-CT-scans, grades II-III in 34.3%, and grade IV in 13.2%, with in females twice as frequently (45%) higher grades (III, IV) than in males (22%, III). The average inclination angle was 8.4°. In glenoids with inclination ≤10°, mineralisation was predominantly centrally distributed and tended to shift more cranially when the inclination raised to > 10°. The average retroversion angle was - 5.2°. A dorsally enhanced mineralisation distribution was found in glenoids with versions from - 15.9° to + 1.7°. A predominantly centrally distributed mineralisation was accompanied by a narrower range of retroversion angles between - 10° to - 0.4°. CONCLUSIONS: This study is one of the first to combine CT-based analyses of glenoid angles and mineralisation distribution in an elderly population. The data set is limited to 19 individuals, however, indicates that superior inclination between 0° and 10°-15°, and dorsal version ranging between - 9° to - 3° may be predominantly associated with anterior and central mineralisation patterns previously classified as physiological for the shoulder joint. The current basic research findings may serve as basic data set for future studies addressing the glenoid geometry for treatment planning in omarthritis.


Assuntos
Corpo Humano , Articulação do Ombro , Idoso , Idoso de 80 Anos ou mais , Calcificação Fisiológica , Feminino , Humanos , Masculino , Escápula , Articulação do Ombro/diagnóstico por imagem , Tomografia Computadorizada por Raios X
7.
Nat Commun ; 12(1): 5997, 2021 10 14.
Artigo em Inglês | MEDLINE | ID: mdl-34650046

RESUMO

Determining the time since death, i.e., post-mortem interval (PMI), often plays a key role in forensic investigations. The current standard PMI-estimation method empirically correlates rectal temperatures and PMIs, frequently necessitating subjective correction factors. To overcome this, we previously developed a thermodynamic finite-difference (TFD) algorithm, providing a rigorous method to simulate post-mortem temperatures of bodies assuming a straight posture. However, in forensic practice, bodies are often found in non-straight postures, potentially limiting applicability of this algorithm in these cases. Here, we develop an individualised approach, enabling PMI reconstruction for bodies in arbitrary postures, by combining photogrammetry and TFD modelling. Utilising thermal photogrammetry, this approach also represents the first non-contact method for PMI reconstruction. The performed lab and crime scene validations reveal PMI reconstruction accuracies of 0.26 h ± 1.38 h for true PMIs between 2 h and 35 h and total procedural durations of ~15 min. Together, these findings broaden the potential applicability of TFD-based PMI reconstruction.


Assuntos
Autopsia/métodos , Corpo Humano , Imageamento Tridimensional/métodos , Idoso , Idoso de 80 Anos ou mais , Algoritmos , Engenharia Biomédica , Testes Diagnósticos de Rotina , Feminino , Humanos , Masculino , Mudanças Depois da Morte
8.
Isr Med Assoc J ; 23(10): 676-680, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-34672455

RESUMO

BACKGROUND: Leonardo da Vinci, the artist and scientist, was an archetype figure of the Renaissance era. He was an autodidactic polymath in natural sciences, engineering, and physical sciences, imbued with universality, prodigious inventive imagination, and curiosity to know and understand the world around him. Among his myriad activities, anatomy, physiology, and biomechanics of the musculoskeletal system and the underlying systems fully engaged him. Leonardo dissected dozens of human and animal corpses to study. His anatomical illustrations were precise, combining art and science with an impeccable integration of both. Multiple drawings, diagrams, sketches, and designs are found in his notes. Leonardo's style was intensely personal, unveiling his thoughts, passions, and emotions. We analyzed significant biographic aspects of Leonardo's life, remarking on his scientific and life conceptions and their manifestation in his anatomical designs. The contribution of preceding anatomists is reported as a source of his inspiration as well as motivation to successors. Leonardo da Vinci left no publications, but rather an extensive collection of personal notebooks. Leonardo's contribution to modern anatomy was enormous and he is considered by the scientific and medical community as the father of the modern anatomy.


Assuntos
Anatomia Artística/história , Corpo Humano , Medicina nas Artes/história , Ciência nas Artes/história , Pessoas Famosas , História do Século XVI , Humanos , Itália
9.
Transfus Clin Biol ; 28(4): 353-359, 2021 Nov.
Artigo em Francês | MEDLINE | ID: mdl-34530174

RESUMO

The therapeutic use of elements and products of the human body has always raised serious questions about the balance to be respected between a duty to protect donors and a compelling therapeutic purpose for a patient. Our body is part of a relationship of otherness, since it embodies the person, a relationship that is sometimes therapeutic, for oneself or for others. As an object of gift, the body requires protection. However, if ethics of donation is based on common axiological and protective elements, the field of donation of human body parts is vast and evolving. Each type of donation has its own specificity and its own references, which requires pragmatism, collective reflection, in which everybody should be able to participate in an informed manner.


Assuntos
Corpo Humano , Obtenção de Tecidos e Órgãos , Humanos , Doadores de Tecidos
10.
J Cogn Neurosci ; 33(7): 1343-1353, 2021 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-34496405

RESUMO

To navigate the social world, humans must represent social entities and the relationships between those entities, starting with spatial relationships. Recent research suggests that two bodies are processed with particularly high efficiency in visual perception, when they are in a spatial positioning that cues interaction, that is, close and face-to-face. Socially relevant spatial relations such as facingness may facilitate visual perception by triggering grouping of bodies into a new integrated percept, which would make the stimuli more visible and easier to process. We used EEG and a frequency-tagging paradigm to measure a neural correlate of grouping (or visual binding), while female and male participants saw images of two bodies face-to-face or back-to-back. The two bodies in a dyad flickered at frequency F1 and F2, respectively, and appeared together at a third frequency Fd (dyad frequency). This stimulation should elicit a periodic neural response for each body at F1 and F2, and a third response at Fd, which would be larger for face-to-face (vs. back-to-back) bodies, if those stimuli yield additional integrative processing. Results showed that responses at F1 and F2 were higher for upright than for inverted bodies, demonstrating that our paradigm could capture neural activity associated with viewing bodies. Crucially, the response to dyads at Fd was larger for face-to-face (vs. back-to-back) dyads, suggesting integration mediated by grouping. We propose that spatial relations that recur in social interaction (i.e., facingness) promote binding of multiple bodies into a new representation. This mechanism can explain how the visual system contributes to integrating and transforming the representation of disconnected body shapes into structured representations of social events.


Assuntos
Corpo Humano , Percepção Visual , Sinais (Psicologia) , Feminino , Humanos , Masculino , Orientação Espacial , Reconhecimento Visual de Modelos , Estimulação Luminosa , Interação Social
11.
JNMA J Nepal Med Assoc ; 59(234): 141-145, 2021 Feb 28.
Artigo em Inglês | MEDLINE | ID: mdl-34506450

RESUMO

INTRODUCTION: The study of clinical anatomy is inseparable from cadaveric dissection. However, scarcity of cadavers is observed all over the world. So, body donation is propounded and is a major source of cadavers worldwide. However, nowadays, there is a scarcity of cadavers for the body dissection in the medical course & also due to the rise in the number of medical institutions in Nepal. This research aimed to find out the knowledge of medical and nursing students at a medical college regarding human body and organ donation. METHODS: A descriptive cross-sectional study was conducted among 400 medical and nursing students in a tertiary care hospital of Kathmandu valley. After obtaining ethical approval, a semistructured questionnaire was used to collect the data. Data were analyzed using Statistical Package for Social Sciences version 20.0. RESULTS: Most of the respondents, 360 (90%) knew that organs could be donated from living donors as well as cadavers. A majority of the respondents 374 (93.5%) said that bodies could be donated for educational and learning purposes. The eyes were the most commonly donated organ. One hundred seventy five (43.5%) of the respondents were motivated to donate their bodies or organs. Self-motivation followed by motivation through media by celebrities, family members, and faculties were seen among the participants. CONCLUSIONS: We need a proper voluntary body donation act to facilitate medical teaching with the proper motivation of people for this generous gift to further the knowledge and expand the field of medical science.


Assuntos
Estudantes de Medicina , Obtenção de Tecidos e Órgãos , Estudos Transversais , Conhecimentos, Atitudes e Prática em Saúde , Corpo Humano , Humanos , Inquéritos e Questionários , Universidades
12.
Comput Intell Neurosci ; 2021: 9918175, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34539773

RESUMO

In real life, people's life gradually tends to be simple, so the convenience of online shopping makes more and more research begin to explore the convenience optimization of shopping, in which the fitting system is the research product. However, due to the immaturity of the virtual fitting system, there are a lot of problems, such as the expression of clothing color is not clear or deviation. In view of this, this paper proposes a 3D clothing color display model based on deep learning to support human modeling-driven. Firstly, the macro-micro adversarial network (MMAN) based on deep learning is used to analyze the original image, and then, the results are preprocessed. Finally, the 3D model with the original image color is constructed by using UV mapping. The experimental results show that the accuracy of the MMAN algorithm reaches 0.972, the established three-dimensional model is emotional enough, the expression of the clothing color is clear, and the difference between the color difference and the original image is within 0.01, and the subjective evaluation of volunteers is more than 90 points. The above results show that it is effective to use deep learning to build a 3D model with the original picture clothing color, which has great guiding significance for the research of character model modeling and simulation.


Assuntos
Aprendizado Profundo , Algoritmos , Vestuário , Corpo Humano , Humanos , Interface Usuário-Computador
13.
Sensors (Basel) ; 21(17)2021 Aug 26.
Artigo em Inglês | MEDLINE | ID: mdl-34502651

RESUMO

We present a simple-structured strain sensor based on a low-cost ionic liquid. The ionic liquid was made of sodium chloride/propylene glycol solution and was embedded in a linear microfluidic channel fabricated using Ecoflex. The proposed sensor is capable of measuring strain up to 100% with excellent repeatability. The highest gauge factor is obtained as 6.19 under direct current excitation and 3.40 under alternating current excitation at 1 kHz. The sensor shows negligible hysteresis and overshoot, and survived 10,000 rapid stretch-release cycles of a 100% peak strain with a minor deviation in the response signal. The sensor can be mounted to different locations on the human body and suits a variety of applications in the field of motion detection, human-machine interface and healthcare monitoring.


Assuntos
Líquidos Iônicos , Dispositivos Eletrônicos Vestíveis , Corpo Humano , Humanos , Microfluídica , Movimento (Física)
14.
PLoS One ; 16(9): e0257638, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34534258

RESUMO

Some concepts in nuclear radiation physics are abstract and intellectually demanding. In the present paper, an "MCHP platform" (MCHP was an acronym for Monte Carlo simulations + Human Phantoms) was proposed to provide assistance to the students through visualization. The platform involved Monte Carlo simulations of interactions between ionizing radiations and the Oak Ridge National Laboratory (ORNL) adult male human phantom. As an example to demonstrate the benefits of the proposed MCHP platform, the present paper investigated the variation of the absorbed photon dose per photon from a 137Cs source in three selected organs, namely, brain, spine and thyroid of an adult male for concrete and lead shields with varying thicknesses. The results were interesting but not readily comprehensible without direct visualization. Graphical visualization snapshots as well as video clips of real time interactions between the photons and the human phantom were presented for the involved cases, and the results were explained with the help of such snapshots and video clips. It is envisaged that, if the platform is found useful and effective by the readers, the readers can also propose examples to be gradually added onto this platform in future, with the ultimate goal of enhancing students' understanding and learning the concepts in an undergraduate nuclear radiation physics course or a related course.


Assuntos
Método de Monte Carlo , Física Nuclear/educação , Proteção Radiológica/métodos , Encéfalo/efeitos da radiação , Radioisótopos de Césio/química , Corpo Humano , Humanos , Fótons , Proteção Radiológica/instrumentação , Radiação Ionizante , Radiometria , Estudantes
15.
Ecotoxicology ; 30(10): 2132-2135, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34536160

RESUMO

It has been observed that freshwater planarians can accumulate cadmium in their head portions, with neurotoxicity and head loss accompanying this phenomenon. Since planarians exhibit head loss and symptoms of neurotoxicity in response to PAHs, we investigated the differential accumulation of pyrene and B[a]P in the body and head portions of Girardia tigrina, a freshwater planarian. It is evidenced that planarian head fragments present higher amounts of pyrene- and B[a]P-equivalents than body fragments, indicating a differential distribution of these compounds within planarian tissues.


Assuntos
Planárias , Hidrocarbonetos Policíclicos Aromáticos , Animais , Cádmio , Corpo Humano , Hidrocarbonetos Policíclicos Aromáticos/toxicidade
16.
Front Public Health ; 9: 725310, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34490200

RESUMO

In this paper, human exposures to ultra-wideband (UWB) electromagnetic (EM) pulses in the microwave region are assessed using a frequency-dependent FDTD scheme previously proposed by the authors. Complex permittivity functions of all biological tissues used in the numerical analyses are accurately expressed by the four-term Cole-Cole model. In our method, we apply the fast inverse Laplace transform to determine the time-domain impulse response, utilize the Prony method to find the Z-domain representation, and extract residues and poles for use in the FDTD formulation. Update equations for the electric field are then derived via the Z-transformation. Firstly, we perform reflection and transmission analyses of a multilayer composed of six different biological tissues and then confirm the validity of the proposed method by comparison with analytical results. Finally, numerical dosimetry of various human bodies exposed to EM pulses from the front in the microwave frequency range is performed, and the specific energy absorption is evaluated and compared with that prescribed in international guidelines.


Assuntos
Corpo Humano , Micro-Ondas , Fenômenos Eletromagnéticos , Humanos , Modelos Biológicos , Radiometria
17.
Cuad Bioet ; 32(105): 195-211, 2021.
Artigo em Espanhol | MEDLINE | ID: mdl-34543049

RESUMO

The recent development of NBIC technologies has led to the emergence of new techniques that allow the modification of genetic, morphological, and physiological aspects of the human being to improve their capacities. In light of this situation, the eternal debate continues: is everything technically possible ethically acceptable? To answer this question, an ethical reflection is needed to assess the scope of enhancement techniques and to direct them to the service of human progress and the common good. Many authors have already begun this reflection, opting for a case-by-case evaluation. However, there is a great lack of specificity in the definition of the criteria that would allow an ethical analysis of each technique, in order to determine the licitness of its application. In response to this need, a practical guide for the ethical assessment of not only human enhancement techniques, but of any intervention on the human body is proposed. This guide is based on the four principles of personalist bioethics proposed by Sgreccia: the principle of defense of physical human life, the principle of totality or the therapeutic principle, the principle of freedom and responsibility, and the principle of sociability and subsidiarity. These principles are the common thread of some questionnaires that serve as support in discerning the licitness of a technique, by virtue of the overall good of the person in their three-dimensional structure: body, mind and spirit, and the respect for their inalienable dignity.


Assuntos
Bioética , Corpo Humano , Análise Ética , Humanos , Princípios Morais , Justiça Social
18.
Exp Brain Res ; 239(12): 3417-3429, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34536083

RESUMO

Previous research about body size estimation in obesity reported heterogeneous results. This might be related to the fact that the tasks adopted explored different body representations. Classifying the previous studies according to the specific body representation probed (i.e. implicit, explicit or both) might clarify discordant findings. A systematic review and meta-analysis of research articles assessing body size estimation in individuals affected by obesity compared with healthy weight individuals were performed in PubMed and Web of Science. Additional records were identified by reference lists inspection. The last search was run in May 2021. Two independent authors performed data extraction according to predefined criteria. Both groups either overestimated or underestimated the implicit body representation depending on the task used and the body part considered. Conversely, the explicit representation of the body was mainly overestimated by both individuals with obesity and healthy weight. In tasks relying on both these representations, overestimation and underestimation were reported in both groups, possibly depending on the degree of which each procedure relied on the explicit and/or implicit representation of the body. According to the meta-analysis, individuals with obesity tended to be significantly less accurate in body size estimations than participants with healthy weight. We confirmed that heterogeneous findings in body size estimation in obesity are related to the adoption of different tasks, which likely involve different body representations. We discussed the role of body dissatisfaction and altered somatosensation in the lower accuracy observed in obesity.


Assuntos
Imagem Corporal , Obesidade , Tamanho Corporal , Corpo Humano , Humanos
20.
Sci Rep ; 11(1): 16510, 2021 08 13.
Artigo em Inglês | MEDLINE | ID: mdl-34389767

RESUMO

Touching an object can elicit affective sensations. Because these sensations are critical for social interaction, tactile preferences may be adapted to the characteristics of the human body. We have previously shown that compliance, a physical correlate of softness, increased the tactile pleasantness of a deformable surface. However, the extent to which object compliance similar to the human body elicits tactile pleasantness remains unknown. We addressed this question by using a wide range of compliances and by measuring the distribution of compliance of human body parts. The participants numerically estimated the perceived pleasantness or softness while pushing tactile stimuli with their right index fingers. The perceived softness monotonically increased with increasing compliance and then leveled off around the end of the stimulus range. By contrast, pleasantness showed an inverse U pattern as a function of compliance, reaching the maximum between 5 and 7 mm/N. This range of compliance was within that for both hand and arm. These results indicate that objects with similar compliance levels as those of human body parts yield the highest pleasantness when pushing them.


Assuntos
Percepção do Tato/fisiologia , Tato/fisiologia , Adolescente , Adulto , Feminino , Dedos , Dureza , Corpo Humano , Humanos , Individualidade , Masculino , Prazer , Estresse Mecânico , Adulto Jovem
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