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  1 / 25867 MEDLINE  
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[PMID]:29240813
[Au] Autor:Yashar A; Denison RN
[Ad] Endereço:Department of Psychology and Center for Neural Science, New York University, New York, New York, United States of America.
[Ti] Título:Feature reliability determines specificity and transfer of perceptual learning in orientation search.
[So] Source:PLoS Comput Biol;13(12):e1005882, 2017 12.
[Is] ISSN:1553-7358
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Training can modify the visual system to produce a substantial improvement on perceptual tasks and therefore has applications for treating visual deficits. Visual perceptual learning (VPL) is often specific to the trained feature, which gives insight into processes underlying brain plasticity, but limits VPL's effectiveness in rehabilitation. Under what circumstances VPL transfers to untrained stimuli is poorly understood. Here we report a qualitatively new phenomenon: intrinsic variation in the representation of features determines the transfer of VPL. Orientations around cardinal are represented more reliably than orientations around oblique in V1, which has been linked to behavioral consequences such as visual search asymmetries. We studied VPL for visual search of near-cardinal or oblique targets among distractors of the other orientation while controlling for other display and task attributes, including task precision, task difficulty, and stimulus exposure. Learning was the same in all training conditions; however, transfer depended on the orientation of the target, with full transfer of learning from near-cardinal to oblique targets but not the reverse. To evaluate the idea that representational reliability was the key difference between the orientations in determining VPL transfer, we created a model that combined orientation-dependent reliability, improvement of reliability with learning, and an optimal search strategy. Modeling suggested that not only search asymmetries but also the asymmetric transfer of VPL depended on preexisting differences between the reliability of near-cardinal and oblique representations. Transfer asymmetries in model behavior also depended on having different learning rates for targets and distractors, such that greater learning for low-reliability distractors facilitated transfer. These findings suggest that training on sensory features with intrinsically low reliability may maximize the generalizability of learning in complex visual environments.
[Mh] Termos MeSH primário: Orientação/fisiologia
Transferência de Experiência (Psicologia)/fisiologia
Percepção Visual/fisiologia
[Mh] Termos MeSH secundário: Adulto
Encéfalo/fisiologia
Biologia Computacional
Feminino
Seres Humanos
Aprendizagem/fisiologia
Masculino
Modelos Neurológicos
Modelos Psicológicos
Plasticidade Neuronal/fisiologia
Estimulação Luminosa
Reprodutibilidade dos Testes
Aprendizagem Espacial/fisiologia
Análise e Desempenho de Tarefas
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171215
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pcbi.1005882


  2 / 25867 MEDLINE  
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[PMID]:27775722
[Au] Autor:Laurens J; Kim B; Dickman JD; Angelaki DE
[Ad] Endereço:Department of Neuroscience, Baylor College of Medicine, Houston, Texas, USA.
[Ti] Título:Gravity orientation tuning in macaque anterior thalamus.
[So] Source:Nat Neurosci;19(12):1566-1568, 2016 12.
[Is] ISSN:1546-1726
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Gravity may provide a ubiquitous allocentric reference to the brain's spatial orientation circuits. Here we describe neurons in the macaque anterior thalamus tuned to pitch and roll orientation relative to gravity, independently of visual landmarks. We show that individual cells exhibit two-dimensional tuning curves, with peak firing rates at a preferred vertical orientation. These results identify a thalamic pathway for gravity cues to influence perception, action and spatial cognition.
[Mh] Termos MeSH primário: Potenciais de Ação/fisiologia
Núcleos Anteriores do Tálamo/fisiologia
Cognição/fisiologia
Gravitação
Neurônios/fisiologia
Orientação/fisiologia
Percepção Espacial/fisiologia
[Mh] Termos MeSH secundário: Animais
Macaca
Estimulação Luminosa/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL
[Em] Mês de entrada:1709
[Cu] Atualização por classe:180223
[Lr] Data última revisão:
180223
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161108
[St] Status:MEDLINE
[do] DOI:10.1038/nn.4423


  3 / 25867 MEDLINE  
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[PMID]:29240769
[Au] Autor:Muir DR; Molina-Luna P; Roth MM; Helmchen F; Kampa BM
[Ad] Endereço:Biozentrum, University of Basel, Basel, Switzerland.
[Ti] Título:Specific excitatory connectivity for feature integration in mouse primary visual cortex.
[So] Source:PLoS Comput Biol;13(12):e1005888, 2017 12.
[Is] ISSN:1553-7358
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Local excitatory connections in mouse primary visual cortex (V1) are stronger and more prevalent between neurons that share similar functional response features. However, the details of how functional rules for local connectivity shape neuronal responses in V1 remain unknown. We hypothesised that complex responses to visual stimuli may arise as a consequence of rules for selective excitatory connectivity within the local network in the superficial layers of mouse V1. In mouse V1 many neurons respond to overlapping grating stimuli (plaid stimuli) with highly selective and facilitatory responses, which are not simply predicted by responses to single gratings presented alone. This complexity is surprising, since excitatory neurons in V1 are considered to be mainly tuned to single preferred orientations. Here we examined the consequences for visual processing of two alternative connectivity schemes: in the first case, local connections are aligned with visual properties inherited from feedforward input (a 'like-to-like' scheme specifically connecting neurons that share similar preferred orientations); in the second case, local connections group neurons into excitatory subnetworks that combine and amplify multiple feedforward visual properties (a 'feature binding' scheme). By comparing predictions from large scale computational models with in vivo recordings of visual representations in mouse V1, we found that responses to plaid stimuli were best explained by assuming feature binding connectivity. Unlike under the like-to-like scheme, selective amplification within feature-binding excitatory subnetworks replicated experimentally observed facilitatory responses to plaid stimuli; explained selective plaid responses not predicted by grating selectivity; and was consistent with broad anatomical selectivity observed in mouse V1. Our results show that visual feature binding can occur through local recurrent mechanisms without requiring feedforward convergence, and that such a mechanism is consistent with visual responses and cortical anatomy in mouse V1.
[Mh] Termos MeSH primário: Modelos Neurológicos
Córtex Visual/fisiologia
[Mh] Termos MeSH secundário: Animais
Sinalização do Cálcio/fisiologia
Biologia Computacional
Feminino
Masculino
Camundongos
Camundongos Endogâmicos C57BL
Rede Nervosa/fisiologia
Neurônios/fisiologia
Orientação/fisiologia
Estimulação Luminosa
Sinapses/fisiologia
Córtex Visual/citologia
Vias Visuais/citologia
Vias Visuais/fisiologia
Percepção Visual/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180123
[Lr] Data última revisão:
180123
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171215
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pcbi.1005888


  4 / 25867 MEDLINE  
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[PMID]:27773567
[Au] Autor:Hoy JL; Yavorska I; Wehr M; Niell CM
[Ad] Endereço:Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA; Department of Biology, University of Oregon, Eugene, OR 97403, USA.
[Ti] Título:Vision Drives Accurate Approach Behavior during Prey Capture in Laboratory Mice.
[So] Source:Curr Biol;26(22):3046-3052, 2016 Nov 21.
[Is] ISSN:1879-0445
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The ability to genetically identify and manipulate neural circuits in the mouse is rapidly advancing our understanding of visual processing in the mammalian brain [1, 2]. However, studies investigating the circuitry that underlies complex ethologically relevant visual behaviors in the mouse have been primarily restricted to fear responses [3-5]. Here, we show that a laboratory strain of mouse (Mus musculus, C57BL/6J) robustly pursues, captures, and consumes live insect prey and that vision is necessary for mice to perform the accurate orienting and approach behaviors leading to capture. Specifically, we differentially perturbed visual or auditory input in mice and determined that visual input is required for accurate approach, allowing maintenance of bearing to within 11° of the target on average during pursuit. While mice were able to capture prey without vision, the accuracy of their approaches and capture rate dramatically declined. To better explore the contribution of vision to this behavior, we developed a simple assay that isolated visual cues and simplified analysis of the visually guided approach. Together, our results demonstrate that laboratory mice are capable of exhibiting dynamic and accurate visually guided approach behaviors and provide a means to estimate the visual features that drive behavior within an ethological context.
[Mh] Termos MeSH primário: Comportamento Predatório
Visão Ocular
Percepção Visual
[Mh] Termos MeSH secundário: Animais
Percepção Auditiva
Feminino
Masculino
Camundongos
Camundongos Endogâmicos C57BL
Orientação
Distribuição Aleatória
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180112
[Lr] Data última revisão:
180112
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE


  5 / 25867 MEDLINE  
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[PMID]:27773362
[Au] Autor:Rossi MM; Alderson J; El-Sallam A; Dowling J; Reinbolt J; Donnelly CJ
[Ad] Endereço:School of Sport Science, Exercise and Health, The University of Western Australia, Perth, Australia.
[Ti] Título:A new validation technique for estimations of body segment inertia tensors: Principal axes of inertia do matter.
[So] Source:J Biomech;49(16):4119-4123, 2016 12 08.
[Is] ISSN:1873-2380
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The aims of this study were to: (i) establish a new criterion method to validate inertia tensor estimates by setting the experimental angular velocity data of an airborne objects as ground truth against simulations run with the estimated tensors, and (ii) test the sensitivity of the simulations to changes in the inertia tensor components. A rigid steel cylinder was covered with reflective kinematic markers and projected through a calibrated motion capture volume. Simulations of the airborne motion were run with two models, using inertia tensor estimated with geometric formula or the compound pendulum technique. The deviation angles between experimental (ground truth) and simulated angular velocity vectors and the root mean squared deviation angle were computed for every simulation. Monte Carlo analyses were performed to assess the sensitivity of simulations to changes in magnitude of principal moments of inertia within ±10% and to changes in orientation of principal axes of inertia within ±10° (of the geometric-based inertia tensor). Root mean squared deviation angles ranged between 2.9° and 4.3° for the inertia tensor estimated geometrically, and between 11.7° and 15.2° for the compound pendulum values. Errors up to 10% in magnitude of principal moments of inertia yielded root mean squared deviation angles ranging between 3.2° and 6.6°, and between 5.5° and 7.9° when lumped with errors of 10° in principal axes of inertia orientation. The proposed technique can effectively validate inertia tensors from novel estimation methods of body segment inertial parameter. Principal axes of inertia orientation should not be neglected when modelling human/animal mechanics.
[Mh] Termos MeSH primário: Movimento
[Mh] Termos MeSH secundário: Fenômenos Biomecânicos
Simulação por Computador
Seres Humanos
Processamento de Imagem Assistida por Computador
Modelos Biológicos
Método de Monte Carlo
Orientação
[Pt] Tipo de publicação:JOURNAL ARTICLE; VALIDATION STUDIES
[Em] Mês de entrada:1710
[Cu] Atualização por classe:180104
[Lr] Data última revisão:
180104
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE


  6 / 25867 MEDLINE  
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[PMID]:29196759
[Au] Autor:Joo SJ
[Ad] Endereço:Institute for Learning & Brain Sciences, University of Washington, Seattle, WA, USA.
[Ti] Título:Functional MRI, ERP, and psychophysical measures show that contextual effects are orientation tuned and suppressive.
[So] Source:J Vis;17(14):1, 2017 Dec 01.
[Is] ISSN:1534-7362
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The response of V1 neurons to a stimulus placed inside the classical receptive field can be modulated by stimuli presented outside the classical receptive field. However, the specific nature of these contextual modulations is unknown. Both enhancement and suppression have been observed as well as variability across measurement methodologies. To assess whether the contextual effect is facilitative or suppressive, we measured neural responses to an oriented Gabor stimulus ("target") in three conditions: in isolation, with two Gabor flankers that were the same orientation as the target, and with two flankers that were orthogonal to the target orientation. We show that the target-related fMRI response, event-related potential amplitude, and the amount of contrast adaptation are all lower when the flankers were the same orientation compared to both the isolated and orthogonal conditions. There was no evidence of response enhancement. These results all point to an orientation-tuned suppressive effect of contextual stimuli measured in the periphery that is well explained by models incorporating divisive or subtractive inhibition.
[Mh] Termos MeSH primário: Potenciais Evocados Visuais/fisiologia
Imagem por Ressonância Magnética/métodos
Orientação Espacial/fisiologia
Orientação/fisiologia
Psicofísica/métodos
Córtex Visual/diagnóstico por imagem
[Mh] Termos MeSH secundário: Seres Humanos
Estimulação Luminosa/métodos
Córtex Visual/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171226
[Lr] Data última revisão:
171226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171203
[St] Status:MEDLINE
[do] DOI:10.1167/17.14.1


  7 / 25867 MEDLINE  
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[PMID]:29053781
[Au] Autor:Schütt HH; Wichmann FA
[Ad] Endereço:Neural Information Processing Group, University of Tübingen, Tübingen, Germany.
[Ti] Título:An image-computable psychophysical spatial vision model.
[So] Source:J Vis;17(12):12, 2017 Oct 01.
[Is] ISSN:1534-7362
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A large part of classical visual psychophysics was concerned with the fundamental question of how pattern information is initially encoded in the human visual system. From these studies a relatively standard model of early spatial vision emerged, based on spatial frequency and orientation-specific channels followed by an accelerating nonlinearity and divisive normalization: contrast gain-control. Here we implement such a model in an image-computable way, allowing it to take arbitrary luminance images as input. Testing our implementation on classical psychophysical data, we find that it explains contrast detection data including the ModelFest data, contrast discrimination data, and oblique masking data, using a single set of parameters. Leveraging the advantage of an image-computable model, we test our model against a recent dataset using natural images as masks. We find that the model explains these data reasonably well, too. To explain data obtained at different presentation durations, our model requires different parameters to achieve an acceptable fit. In addition, we show that contrast gain-control with the fitted parameters results in a very sparse encoding of luminance information, in line with notions from efficient coding. Translating the standard early spatial vision model to be image-computable resulted in two further insights: First, the nonlinear processing requires a denser sampling of spatial frequency and orientation than optimal coding suggests. Second, the normalization needs to be fairly local in space to fit the data obtained with natural image masks. Finally, our image-computable model can serve as tool in future quantitative analyses: It allows optimized stimuli to be used to test the model and variants of it, with potential applications as an image-quality metric. In addition, it may serve as a building block for models of higher level processing.
[Mh] Termos MeSH primário: Simulação por Computador
Sensibilidades de Contraste/fisiologia
Orientação/fisiologia
Reconhecimento Visual de Modelos/fisiologia
Psicofísica/métodos
Percepção Espacial/fisiologia
Navegação Espacial/fisiologia
[Mh] Termos MeSH secundário: Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171021
[St] Status:MEDLINE
[do] DOI:10.1167/17.12.12


  8 / 25867 MEDLINE  
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[PMID]:29049593
[Au] Autor:Zimmermann E; Weidner R; Fink GR
[Ad] Endereço:Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany.
[Ti] Título:Spatiotopic updating of visual feature information.
[So] Source:J Vis;17(12):6, 2017 Oct 01.
[Is] ISSN:1534-7362
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Saccades shift the retina with high-speed motion. In order to compensate for the sudden displacement, the visuomotor system needs to combine saccade-related information and visual metrics. Many neurons in oculomotor but also in visual areas shift their receptive field shortly before the execution of a saccade (Duhamel, Colby, & Goldberg, 1992; Nakamura & Colby, 2002). These shifts supposedly enable the binding of information from before and after the saccade. It is a matter of current debate whether these shifts are merely location based (i.e., involve remapping of abstract spatial coordinates) or also comprise information about visual features. We have recently presented fMRI evidence for a feature-based remapping mechanism in visual areas V3, V4, and VO (Zimmermann, Weidner, Abdollahi, & Fink, 2016). In particular, we found fMRI adaptation in cortical regions representing a stimulus' retinotopic as well as its spatiotopic position. Here, we asked whether spatiotopic adaptation exists independently from retinotopic adaptation and which type of information is behaviorally more relevant after saccade execution. We first adapted at the saccade target location only and found a spatiotopic tilt aftereffect. Then, we simultaneously adapted both the fixation and the saccade target location but with opposite tilt orientations. As a result, adaptation from the fixation location was carried retinotopically to the saccade target position. The opposite tilt orientation at the retinotopic location altered the effects induced by spatiotopic adaptation. More precisely, it cancelled out spatiotopic adaptation at the saccade target location. We conclude that retinotopic and spatiotopic visual adaptation are independent effects.
[Mh] Termos MeSH primário: Adaptação Fisiológica
Orientação Espacial/fisiologia
Orientação/fisiologia
Movimentos Sacádicos/fisiologia
[Mh] Termos MeSH secundário: Adulto
Feminino
Seres Humanos
Masculino
Estimulação Luminosa
Retina/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171020
[St] Status:MEDLINE
[do] DOI:10.1167/17.12.6


  9 / 25867 MEDLINE  
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[PMID]:29036180
[Au] Autor:Laboissière R; Barraud PA; Cian C
[Ad] Endereço:Univ. Grenoble Alpes, CNRS, LPNC, Grenoble, France.
[Ti] Título:Real and visually-induced body inclination differently affect the perception of object stability.
[So] Source:PLoS One;12(10):e0186431, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The prediction of object stability on earth requires the establishment of a perceptual frame of reference based on the direction of gravity. Across three experiments, we measured the critical angle (CA) at which an object appeared equally likely to fall over or right itself. We investigated whether the internal representation of the gravity direction, biased by either simulated tilt (rotating visual surround) or real body tilt situations, influences in a similar fashion the judgment of stability. In the simulated tilt condition, the estimated CA and the perceived gravity are both deviated in the same direction. In the real tilt condition, the orientation of the body affects the perception of gravity direction but has no effect on the estimated CA. Results suggest that people differently weigh gravity direction information provided by visual motion and by visual polarity cues for estimating the stability of objects.
[Mh] Termos MeSH primário: Sensação Gravitacional
Percepção Visual
[Mh] Termos MeSH secundário: Adolescente
Adulto
Sinais (Psicologia)
Feminino
Seres Humanos
Masculino
Movimento (Física)
Orientação
Estimulação Luminosa
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171017
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0186431


  10 / 25867 MEDLINE  
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[PMID]:29020061
[Au] Autor:Niklasson M; Norlander T; Niklasson I; Rasmussen P
[Ad] Endereço:Center for Research and Development, Evidens University College, Göteborg, Sweden.
[Ti] Título:Catching-up: Children with developmental coordination disorder compared to healthy children before and after sensorimotor therapy.
[So] Source:PLoS One;12(10):e0186126, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The aims of the present study were to (a) compare healthy children in terms of sensorimotor maturity to untreated children diagnosed with developmental coordination disorder (DCD) and (b) compare healthy children to diagnosed children following completed treatment with sensorimotor therapy. Participants were 298 children, 196 boys and 102 girls, distributed into a Norm group of healthy children (n = 99) and a group of children diagnosed with DCD (n = 199) with a total mean age of 8.77 years (SD = 2.88). Participants in both groups were assessed on instruments aimed to detect sensorimotor deviations. The children in the DCD group completed, during on average 36 months, sensorimotor therapy which comprised stereotypical fetal- and infant movements, vestibular stimulation, tactile stimulation, auditory stimulation, complementary play exercises, gross motor milestones, and sports-related gross motor skills. At the final visit a full assessment was once more performed. Results showed that the Norm group performed better on all sensorimotor tests as compared to the untreated children from the DCD group, with the exception of an audiometric test where both groups performed at the same level. Girls performed better on tests assessing proprioceptive and balance abilities. Results also showed, after controls for natural maturing effects, that the children from the DCD group after sensorimotor therapy did catch up with the healthy children. The concept of "catching-up" is used within developmental medicine but has not earlier been documented with regard to children and youth in connection with DCD.
[Mh] Termos MeSH primário: Transtornos das Habilidades Motoras/fisiopatologia
Transtornos das Habilidades Motoras/terapia
Córtex Sensório-Motor/fisiopatologia
[Mh] Termos MeSH secundário: Adolescente
Audiometria
Estudos de Casos e Controles
Criança
Pré-Escolar
Feminino
Seres Humanos
Masculino
Orientação/fisiologia
Equilíbrio Postural/fisiologia
Reflexo/fisiologia
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171012
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0186126



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