Base de dados : MEDLINE
Pesquisa : F02.463.593.932.677 [Categoria DeCS]
Referências encontradas : 562 [refinar]
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[PMID]:27548088
[Au] Autor:Dehaqani MR; Zarei MA; Vahabie AH; Esteky H
[Ti] Título:Impairment of perceptual closure in autism for vertex- but not edge-defined object images.
[So] Source:J Vis;16(10):10, 2016 Aug 01.
[Is] ISSN:1534-7362
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:One of the characteristics of autism spectrum disorder (ASD) is atypical sensory processing and perceptual integration. Here, we used an object naming task to test the significance of deletion of vertices versus extended contours (edges) in naming fragmented line drawings of natural objects in typically developing and ASD children. The basic components of a fragmented image in perceptual closure need to be integrated to make a coherent visual perception. When vertices were missing and only edges were visible, typically developing and ASD subjects performed similarly. But typically developing children performed significantly better than ASD children when only vertex information was visible. These results indicate impairment of binding vertices but not edges to form a holistic representation of an object in children with ASD.
[Mh] Termos MeSH primário: Transtorno do Espectro Autista/fisiopatologia
Cognição/fisiologia
Reconhecimento Visual de Modelos/fisiologia
Fechamento Perceptivo/fisiologia
Percepção Visual/fisiologia
[Mh] Termos MeSH secundário: Criança
Feminino
Seres Humanos
Masculino
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170621
[Lr] Data última revisão:
170621
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160823
[St] Status:MEDLINE
[do] DOI:10.1167/16.10.10


  2 / 562 MEDLINE  
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[PMID]:27206312
[Au] Autor:Pepperberg IM; Nakayama K
[Ad] Endereço:Department of Psychology, Harvard University, Cambridge, MA 02138, USA; Department of Psychology, Brandeis University, Waltham, MA 02454, USA. Electronic address: impepper@fas.harvard.edu.
[Ti] Título:Robust representation of shape in a Grey parrot (Psittacus erithacus).
[So] Source:Cognition;153:146-60, 2016 08.
[Is] ISSN:1873-7838
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A Grey parrot, Griffin (Psittacus erithacus), previously taught English labels for various colors and shapes with respect to three-dimensional (3D) stimuli, was tested on his ability to transfer to very different two-dimensional (2D) images consisting of modal and amodal completion stimuli. For modal completion (aka subjective contours), Kanizsa figures were constructed using black 'pac-men' to form regular polygons on colored paper. For amodal completion, portions of variously colored regular 2D polygons were occluded by black circles or other black figures. For each task, Griffin provided a vocal English shape label for five possible shapes designated by their vertices (one, two, three, four, six). His accuracy was high for both amodal completed figures, including probe stimuli (28/38 correct) and modally completed figures (29/38 correct), with chance=0.20. The modally completed case (i.e., Kanizsa subjective figures) is of particular importance as there are no shared image parts between training and testing stimuli. We draw several conclusions from these results. First, a surface level completion process is fully operative insofar as Griffin was able to correctly identify shapes that differed considerably from training images. Second, because parrots can generalize from shapes of real objects to drawings where original image contours were clearly absent, the data provide a compelling example of shape invariance, indicating that visual shapes are processed far beyond that of their image description. Third, parrots with a repertoire of multiple vocal responses can be rigorously tested for visual competencies, an option as yet to be tried in other experimental animals.
[Mh] Termos MeSH primário: Generalização (Psicologia)
Reconhecimento Visual de Modelos
Fechamento Perceptivo
[Mh] Termos MeSH secundário: Animais
Cognição
Masculino
Papagaios
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170428
[Lr] Data última revisão:
170428
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160521
[St] Status:MEDLINE


  3 / 562 MEDLINE  
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[PMID]:27021230
[Au] Autor:Amiaz R; Vainiger D; Gershon AA; Weiser M; Lavidor M; Javitt DC
[Ad] Endereço:Department of Psychiatry, The Chaim Sheba Medical Center, TAU, 52621, Tel Hashomer, Israel. amiazr@gmail.com.
[Ti] Título:Applying Transcranial Magnetic Stimulation (TMS) Over the Dorsal Visual Pathway Induces Schizophrenia-like Disruption of Perceptual Closure.
[So] Source:Brain Topogr;29(4):552-60, 2016 Jul.
[Is] ISSN:1573-6792
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Perceptual closure ability is postulated to depend upon rapid transmission of magnocellular information to prefrontal cortex via the dorsal stream. In contrast, illusory contour processing requires only local interactions within primary and ventral stream visual regions, such as lateral occipital complex. Schizophrenia is associated with deficits in perceptual closure versus illusory contours processing that is hypothesized to reflect impaired magnocellular/dorsal stream. Perceptual closure and illusory contours performance was evaluated in separate groups of 12 healthy volunteers during no TMS, and during repetitive 10 Hz rTMS stimulation over dorsal stream or vertex (TMS-vertex). Perceptual closure and illusory contours were performed in 11 schizophrenia patients, no TMS was applied in these patients. TMS effects were evaluated with repeated measures ANOVA across treatments. rTMS significantly increased perceptual closure identification thresholds, with significant difference between TMS-dorsal stream and no TMS. TMS-dorsal stream also significantly reduced perceptual closure but not illusory contours accuracy. Schizophrenia patients showed increased perceptual closure identification thresholds relative to controls in the no TMS condition, but similar to controls in the TMS-dorsal stream condition. Conclusions of this study are that magnocellular/dorsal stream input is critical for perceptual closure but not illusory contours performance, supporting both trickledown theories of normal perceptual closure function, and magnocellular/dorsal stream theories of visual dysfunction in schizophrenia.
[Mh] Termos MeSH primário: Fechamento Perceptivo
Esquizofrenia/fisiopatologia
Estimulação Magnética Transcraniana
Vias Visuais
[Mh] Termos MeSH secundário: Adulto
Estudos de Casos e Controles
Feminino
Seres Humanos
Masculino
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170508
[Lr] Data última revisão:
170508
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160330
[St] Status:MEDLINE
[do] DOI:10.1007/s10548-016-0487-1


  4 / 562 MEDLINE  
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[PMID]:26861215
[Au] Autor:Grama IC; Kerkhoff A; Wijnen F
[Ad] Endereço:Department of Humanities, Utrecht Institute of Linguistics OTS, Utrecht University, Trans 10, 3512 JK, Utrecht, The Netherlands. I.C.Grama@uu.nl.
[Ti] Título:Gleaning Structure from Sound: The Role of Prosodic Contrast in Learning Non-adjacent Dependencies.
[So] Source:J Psycholinguist Res;45(6):1427-1449, 2016 Dec.
[Is] ISSN:1573-6555
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The ability to detect non-adjacent dependencies (i.e. between a and b in aXb) in spoken input may support the acquisition of morpho-syntactic dependencies (e.g. The princess is kiss ing the frog). Functional morphemes in morpho-syntactic dependencies are often marked by perceptual cues that render them distinct from lexical elements. We use an artificial grammar learning experiment with adults to investigate the role of perceptual cues in non-adjacent dependency learning, by manipulating the perceptual/prosodic properties of the a / b elements in aXb strings and testing participants' incidental learning of these dependencies. Our results show that non-adjacent dependencies are learned both when the dependent elements are perceptually prominent, and when they are perceptually reduced compared to the intervening material (in the same way that functional words are reduced compared to lexical words), but only if integrated into a natural prosodic contour. This result supports the idea that the prosodic properties of natural languages facilitate non-adjacent dependency learning.
[Mh] Termos MeSH primário: Aprendizagem/fisiologia
Multilinguismo
Fechamento Perceptivo/fisiologia
Psicolinguística/métodos
Percepção da Fala/fisiologia
[Mh] Termos MeSH secundário: Adolescente
Adulto
Feminino
Seres Humanos
Masculino
Meia-Idade
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170428
[Lr] Data última revisão:
170428
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160211
[St] Status:MEDLINE


  5 / 562 MEDLINE  
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[PMID]:26550953
[Au] Autor:Spehar B; Halim VA
[Ad] Endereço:School of Psychology, UNSW Australia, Sydney, NSW 2052, Australia. Electronic address: b.spehar@unsw.edu.au.
[Ti] Título:Created unequal: Temporal dynamics of modal and amodal boundary interpolation.
[So] Source:Vision Res;126:97-108, 2016 Sep.
[Is] ISSN:1878-5646
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this study we manipulate the distribution of contrast polarity reversals in inducing configurations to create novel variants of modal and amodal completion. The novel variants, better equated in their geometric and photometric characteristics offer a superior way to probe similarities and differences in the temporal dynamics that underlie different forms of perceptual completion. We use dot localisation to directly compare the spatial characteristics of modally and amodally interpolated contours at presentation durations ranging from 120 to 300ms and find robust differences in the spatiotemporal formation of modally and amodally completed boundaries. Modally completed contours are localised more accurately and with better spatial precision across all presentation durations. Our results challenge the assumption that the boundary interpolation system depends solely on the geometrical relatability of inducing fragments and suggest that boundary interpolation depends on the spatial distribution of local luminance relationships. As an alternative to the strong version of the identity hypothesis, we propose that modal and amodal completion are mediated by different mechanisms, triggered by particular configurations of contrast polarity.
[Mh] Termos MeSH primário: Sensibilidades de Contraste/fisiologia
Percepção de Forma/fisiologia
Ilusões Ópticas/fisiologia
Fechamento Perceptivo/fisiologia
Percepção Visual/fisiologia
[Mh] Termos MeSH secundário: Adulto
Análise de Variância
Feminino
Seres Humanos
Masculino
Estimulação Luminosa/métodos
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171020
[Lr] Data última revisão:
171020
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151110
[St] Status:MEDLINE


  6 / 562 MEDLINE  
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[PMID]:26505685
[Au] Autor:Wilder J; Feldman J; Singh M
[Ad] Endereço:Department of Computer Science, University of Toronto, Toronto, Canada​. Electronic address: jdwilder@cs.toronto.edu.
[Ti] Título:The role of shape complexity in the detection of closed contours.
[So] Source:Vision Res;126:220-231, 2016 Sep.
[Is] ISSN:1878-5646
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The detection of contours in noise has been extensively studied, but the detection of closed contours, such as the boundaries of whole objects, has received relatively little attention. Closed contours pose substantial challenges not present in the simple (open) case, because they form the outlines of whole shapes and thus take on a range of potentially important configural properties. In this paper we consider the detection of closed contours in noise as a probabilistic decision problem. Previous work on open contours suggests that contour complexity, quantified as the negative log probability (Description Length, DL) of the contour under a suitably chosen statistical model, impairs contour detectability; more complex (statistically surprising) contours are harder to detect. In this study we extended this result to closed contours, developing a suitable probabilistic model of whole shapes that gives rise to several distinct though interrelated measures of shape complexity. We asked subjects to detect either natural shapes (Exp. 1) or experimentally manipulated shapes (Exp. 2) embedded in noise fields. We found systematic effects of global shape complexity on detection performance, demonstrating how aspects of global shape and form influence the basic process of object detection.
[Mh] Termos MeSH primário: Percepção de Forma/fisiologia
Reconhecimento Visual de Modelos/fisiologia
Fechamento Perceptivo
[Mh] Termos MeSH secundário: Teorema de Bayes
Discriminação (Psicologia)
Teoria Gestáltica
Seres Humanos
Mascaramento Perceptivo/fisiologia
Estimulação Luminosa/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171020
[Lr] Data última revisão:
171020
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151028
[St] Status:MEDLINE


  7 / 562 MEDLINE  
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[PMID]:26500190
[Au] Autor:Gao Z; Gao Q; Tang N; Shui R; Shen M
[Ad] Endereço:Department of Psychology, Zhejiang University, Hangzhou, China.
[Ti] Título:Organization principles in visual working memory: Evidence from sequential stimulus display.
[So] Source:Cognition;146:277-88, 2016 Jan.
[Is] ISSN:1873-7838
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Although the mechanisms of visual working memory (VWM) have been studied extensively in recent years, the active property of VWM has received less attention. In the current study, we examined how VWM integrates sequentially presented stimuli by focusing on the role of Gestalt principles, which are important organizing principles in perceptual integration. We manipulated the level of Gestalt cues among three or four sequentially presented objects that were memorized. The Gestalt principle could not emerge unless all the objects appeared together. We distinguished two hypotheses: a perception-alike hypothesis and an encoding-specificity hypothesis. The former predicts that the Gestalt cue will play a role in information integration within VWM; the latter predicts that the Gestalt cue will not operate within VWM. In four experiments, we demonstrated that collinearity (Experiment 1) and closure (Experiment 2) cues significantly improved VWM performance, and this facilitation was not affected by the testing manner (Experiment 3) or by adding extra colors to the memorized objects (Experiment 4). Finally, we re-established the Gestalt cue benefit with similarity cues (Experiment 5). These findings together suggest that VWM realizes and uses potential Gestalt principles within the stored representations, supporting a perception-alike hypothesis.
[Mh] Termos MeSH primário: Sinais (Psicologia)
Memória de Curto Prazo/fisiologia
Percepção Visual/fisiologia
[Mh] Termos MeSH secundário: Adolescente
Adulto
Feminino
Teoria Gestáltica
Seres Humanos
Masculino
Fechamento Perceptivo/fisiologia
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170117
[Lr] Data última revisão:
170117
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151027
[St] Status:MEDLINE


  8 / 562 MEDLINE  
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[PMID]:26475087
[Au] Autor:Hazenberg SJ; van Lier R
[Ad] Endereço:Radboud University Nijmegen, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands. Electronic address: s.j.hazenberg@donders.ru.nl.
[Ti] Título:Disentangling effects of structure and knowledge in perceiving partly occluded shapes: An ERP study.
[So] Source:Vision Res;126:109-119, 2016 Sep.
[Is] ISSN:1878-5646
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Using event-related potentials (ERPs) we investigated the influence of object knowledge on perceiving partly occluded shapes. We created stimuli based on well-known objects of which the middle part was occluded. Object completions that were compatible with structure consisted of the connection of the visible fragments by smoothly extending their contours. In contrast, object completions that were incompatible with structure consisted of separate disconnected completions of the fragments. Furthermore, object completions could be in line with, or conflict with expectations based on knowledge. We measured ERPs when hidden parts were revealed by removing the occluder, and observed an early positive ERP peaking around 115-140ms at occipital sites, presumably triggered by physical differences. Most importantly, we observed a positive ERP peaking around 300-400ms at parieto-occipital sites that could be related to influences of both structure and knowledge. An additional analysis controlling for differential stimulus characteristics revealed similar conclusions. All in all, we demonstrate that the interpretation of partly occluded shapes is not solely driven by stimulus structure, but that it can also be influenced by knowledge of objects.
[Mh] Termos MeSH primário: Potenciais Evocados Visuais/fisiologia
Percepção de Forma/fisiologia
Fechamento Perceptivo/fisiologia
Córtex Visual/fisiologia
Percepção Visual/fisiologia
[Mh] Termos MeSH secundário: Adulto
Análise de Variância
Feminino
Seres Humanos
Masculino
Ilusões Ópticas/fisiologia
Estimulação Luminosa/métodos
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171020
[Lr] Data última revisão:
171020
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151018
[St] Status:MEDLINE


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[PMID]:26080728
[Au] Autor:Kropf S; Burger E; Radinski I; Ridwelski K; Lippert H; Altendorf-Hofmann A; Bernarding J
[Ad] Endereço:Institut für Biometrie und medizinische Informatik, Otto-von-Guericke-Universität, Magdeburg.
[Ti] Título:[Completeness and quality of baseline data and follow-up in cancer registry--an analysis on the example of colorectal cancer].
[Ti] Título:Vollständigkeit und Qualität der Basisdaten und der Nachbeobachtung im Krebsregister--Eine Untersuchung am Beispiel des kolorektalen Karzinoms..
[So] Source:Dtsch Med Wochenschr;140(11):e106-13, 2015 May.
[Is] ISSN:1439-4413
[Cp] País de publicação:Germany
[La] Idioma:ger
[Ab] Resumo:BACKGROUND AND AIM: In Germany, data of cancer patients are recorded not only in epidemiological registers but also in clinical cancer registers. To ensure the networking of all included medical partners, quality control, and clinical research it is necessary that cancer cases are captured more or less completely. The aim of the present study was to compare the data sets of two registers. PATIENTS AND METHODS: Data from patients with colorectal cancer from two large surgical clinics in Magdeburg are recorded in two registers - the Clinical Cancer Registry Magdeburg and the Institute of Quality Assurance in Operative Medicine at the Otto-von-Guericke University Magdeburg. Here we compared the data sets in order to check the completeness of data capturing and to determine factors influencing the degree of completeness. RESULTS: From all patients captured in the Institute of Quality Assurance, 78.9% are found also in the clinical cancer registry. The percentage improves over the course of time, but also depends on diagnostic criteria such as the staging. There are some differences between both registries, explainable by their specific objectives. Particularly, it is demonstrated that incomplete follow-up record may bias estimates of survival rates from registries. CONCLUSION: Ensuring the completeness and correctness of data is a major challenge for cancer registries. It has distinct influence on estimated quality parameters such as survival rates.
[Mh] Termos MeSH primário: Neoplasias Colorretais/epidemiologia
Sistema de Registros/normas
[Mh] Termos MeSH secundário: Adulto
Idoso
Idoso de 80 Anos ou mais
Viés
Carcinoma in Situ/diagnóstico
Carcinoma in Situ/epidemiologia
Carcinoma in Situ/terapia
Neoplasias Colorretais/diagnóstico
Neoplasias Colorretais/terapia
Feminino
Seguimentos
Tumores do Estroma Gastrointestinal/diagnóstico
Tumores do Estroma Gastrointestinal/epidemiologia
Tumores do Estroma Gastrointestinal/terapia
Alemanha/epidemiologia
Seres Humanos
Linfoma/diagnóstico
Linfoma/epidemiologia
Linfoma/terapia
Masculino
Melanoma/diagnóstico
Melanoma/epidemiologia
Melanoma/terapia
Meia-Idade
Tumores Neuroendócrinos/diagnóstico
Tumores Neuroendócrinos/epidemiologia
Tumores Neuroendócrinos/terapia
Fechamento Perceptivo
Projetos de Pesquisa/normas
Sarcoma/diagnóstico
Sarcoma/epidemiologia
Sarcoma/terapia
Neoplasias Cutâneas/diagnóstico
Neoplasias Cutâneas/epidemiologia
Neoplasias Cutâneas/terapia
Taxa de Sobrevida
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1508
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150618
[St] Status:MEDLINE
[do] DOI:10.1055/s-0041-102171


  10 / 562 MEDLINE  
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[PMID]:25704454
[Au] Autor:Breitmeyer BG
[Ad] Endereço:Department of Psychology, University of Houston, USA; Center for Neuro-Engineering and Cognitive Science, University of Houston, USA. Electronic address: brunob@uh.edu.
[Ti] Título:Psychophysical "blinding" methods reveal a functional hierarchy of unconscious visual processing.
[So] Source:Conscious Cogn;35:234-50, 2015 Sep.
[Is] ISSN:1090-2376
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Numerous non-invasive experimental "blinding" methods exist for suppressing the phenomenal awareness of visual stimuli. Not all of these suppressive methods occur at, and thus index, the same level of unconscious visual processing. This suggests that a functional hierarchy of unconscious visual processing can in principle be established. The empirical results of extant studies that have used a number of different methods and additional reasonable theoretical considerations suggest the following tentative hierarchy. At the highest levels in this hierarchy is unconscious processing indexed by object-substitution masking. The functional levels indexed by crowding, the attentional blink (and other attentional blinding methods), backward pattern masking, metacontrast masking, continuous flash suppression, sandwich masking, and single-flash interocular suppression, fall at progressively lower levels, while unconscious processing at the lowest levels is indexed by eye-based binocular-rivalry suppression. Although unconscious processing levels indexed by additional blinding methods is yet to be determined, a tentative placement at lower levels in the hierarchy is also given for unconscious processing indexed by Troxler fading and adaptation-induced blindness, and at higher levels in the hierarchy indexed by attentional blinding effects in addition to the level indexed by the attentional blink. The full mapping of levels in the functional hierarchy onto cortical activation sites and levels is yet to be determined. The existence of such a hierarchy bears importantly on the search for, and the distinctions between, neural correlates of conscious and unconscious vision.
[Mh] Termos MeSH primário: Intermitência na Atenção Visual
Fechamento Perceptivo
Mascaramento Perceptivo
Inconsciente (Psicologia)
Percepção Visual
[Mh] Termos MeSH secundário: Atenção
Conscientização
Seres Humanos
Psicofísica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1603
[Cu] Atualização por classe:150613
[Lr] Data última revisão:
150613
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150224
[St] Status:MEDLINE



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