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Pesquisa : F01.058.577.500 [Categoria DeCS]
Referências encontradas : 127 [refinar]
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[PMID]:29208224
[Au] Autor:Heinze S
[Ad] Endereço:Lund University, Department of Biology, Lund Vision Group, Sölvegatan 35, 22362 Lund, Sweden. Electronic address: stanley.heinze@biol.lu.se.
[Ti] Título:Unraveling the neural basis of insect navigation.
[So] Source:Curr Opin Insect Sci;24:58-67, 2017 Dec.
[Is] ISSN:2214-5753
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:One of the defining features of animals is their ability to navigate their environment. Using behavioral experiments this topic has been under intense investigation for nearly a century. In insects, this work has largely focused on the remarkable homing abilities of ants and bees. More recently, the neural basis of navigation shifted into the focus of attention. Starting with revealing the neurons that process the sensory signals used for navigation, in particular polarized skylight, migratory locusts became the key species for delineating navigation-relevant regions of the insect brain. Over the last years, this work was used as a basis for research in the fruit fly Drosophila and extraordinary progress has been made in illuminating the neural underpinnings of navigational processes. With increasingly detailed understanding of navigation circuits, we can begin to ask whether there is a fundamentally shared concept underlying all navigation behavior across insects. This review highlights recent advances and puts them into the context of the behavioral work on ants and bees, as well as the circuits involved in polarized-light processing. A region of the insect brain called the central complex emerges as the common substrate for guiding navigation and its highly organized neuroarchitecture provides a framework for future investigations potentially suited to explain all insect navigation behavior at the level of identified neurons.
[Mh] Termos MeSH primário: Formigas/fisiologia
Abelhas/fisiologia
Drosophila/fisiologia
Orientação Espacial
Navegação Espacial
[Mh] Termos MeSH secundário: Animais
Neurônios/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180119
[Lr] Data última revisão:
180119
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171207
[St] Status:MEDLINE


  2 / 127 MEDLINE  
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[PMID]:29234786
[Au] Autor:Shin H; Zou Q; Ma WJ
[Ad] Endereço:Center for Neural Science and Department of Psychology, New York University, New York, USA.
[Ti] Título:The effects of delay duration on visual working memory for orientation.
[So] Source:J Vis;17(14):10, 2017 Dec 01.
[Is] ISSN:1534-7362
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We used a delayed-estimation paradigm to characterize the joint effects of set size (one, two, four, or six) and delay duration (1, 2, 3, or 6 s) on visual working memory for orientation. We conducted two experiments: one with delay durations blocked, another with delay durations interleaved. As dependent variables, we examined four model-free metrics of dispersion as well as precision estimates in four simple models. We tested for effects of delay time using analyses of variance, linear regressions, and nested model comparisons. We found significant effects of set size and delay duration on both model-free and model-based measures of dispersion. However, the effect of delay duration was much weaker than that of set size, dependent on the analysis method, and apparent in only a minority of subjects. The highest forgetting slope found in either experiment at any set size was a modest 1.14°/s. As secondary results, we found a low rate of nontarget reports, and significant estimation biases towards oblique orientations (but no dependence of their magnitude on either set size or delay duration). Relative stability of working memory even at higher set sizes is consistent with earlier results for motion direction and spatial frequency. We compare with a recent study that performed a very similar experiment.
[Mh] Termos MeSH primário: Memória de Curto Prazo/fisiologia
Orientação Espacial/fisiologia
Percepção Visual/fisiologia
[Mh] Termos MeSH secundário: Feminino
Seres Humanos
Masculino
Estimulação Luminosa
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171227
[Lr] Data última revisão:
171227
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171214
[St] Status:MEDLINE
[do] DOI:10.1167/17.14.10


  3 / 127 MEDLINE  
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[PMID]:29209696
[Au] Autor:Cicchini GM; Mikellidou K; Burr D
[Ad] Endereço:CNR Institute of Neuroscience, Pisa, Italy.
[Ti] Título:Serial dependencies act directly on perception.
[So] Source:J Vis;17(14):6, 2017 Dec 01.
[Is] ISSN:1534-7362
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:There is good evidence that biological perceptual systems exploit the temporal continuity in the world: When asked to reproduce or rate sequentially presented stimuli (varying in almost any dimension), subjects typically err toward the previous stimulus, exhibiting so-called "serial dependence." At this stage it is unclear whether the serial dependence results from averaging within the perceptual system, or at later stages. Here we demonstrate that strong serial dependencies occur within both perceptual and decision processes, with very little contribution from the response. Using a technique to isolate pure perceptual effects (Fritsche, Mostert, & de Lange, 2017), we show strong serial dependence in orientation judgements, over the range of orientations where theoretical considerations predict the effects to be maximal. In a second experiment we dissociate responses from stimuli to show that serial dependence occurs only between stimuli, not responses. The results show that serial dependence is important for perception, exploiting temporal redundancies to enhance perceptual efficiency.
[Mh] Termos MeSH primário: Orientação Espacial/fisiologia
Percepção Visual/fisiologia
[Mh] Termos MeSH secundário: Adulto
Feminino
Seres Humanos
Masculino
Estimulação Luminosa
[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:171207
[St] Status:MEDLINE
[do] DOI:10.1167/17.14.6


  4 / 127 MEDLINE  
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[PMID]:29196763
[Au] Autor:Caziot B; Backus BT; Lin E
[Ad] Endereço:Graduate Center for Vision Research, SUNY College of Optometry, New York, NY, USA.
[Ti] Título:Early dynamics of stereoscopic surface slant perception.
[So] Source:J Vis;17(14):4, 2017 Dec 01.
[Is] ISSN:1534-7362
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Surface orientation is an important visual primitive that can be estimated from monocular or binocular (stereoscopic) signals. Changes in motor planning occur within about 200 ms after either type of signal is perturbed, but the time it takes for apparent (perceived) slant to develop from stereoscopic cues is not known. Apparent slant sometimes develops very slowly (Gillam, Chambers, & Russo, 1988; van Ee & Erkelens, 1996). However, these long durations could reflect the time it takes for the visual system to resolve conflicts between slant cues that inevitably specify different slants in laboratory displays (Allison & Howard, 2000). We used a speed-accuracy tradeoff analysis to measure the time it takes to discriminate slant, allowing us to report psychometric functions as a function of response time. Observers reported which side of a slanted surface was farther, with a temporal deadline for responding that varied block-to-block. Stereoscopic slant discrimination rose above chance starting at 200 ms after stimulus onset. Unexpectedly, observers discriminated slant from binocular disparity faster than texture, and for stereoscopic whole-field stimuli faster than stereoscopic slant contrast stimuli. However, performance after the initial deviation from chance increased more rapidly for slant-contrast stimuli than whole-field stimuli. Discrimination latencies were similar for slants about the horizontal and vertical axes, but performance increased faster for slants about the vertical axis. Finally, slant from vertical disparity was somewhat slower than slant from horizontal disparity, which may reflect cue conflict. These results demonstrate, in contradiction with the previous literature, that the perception of slant from disparity happens very quickly-in fact, more quickly than the perception of slant from texture-and in comparable time to the simple perception of brightness from luminance.
[Mh] Termos MeSH primário: Sinais (Psicologia)
Percepção de Profundidade/fisiologia
Orientação Espacial/fisiologia
Disparidade Visual/fisiologia
[Mh] Termos MeSH secundário: Seres Humanos
Psicometria/métodos
Fatores de Tempo
[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:10.1167/17.14.4


  5 / 127 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


  6 / 127 MEDLINE  
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[PMID]:29173261
[Au] Autor:Sutherland F; Dixon E
[Ad] Endereço:From the Department of Surgery, University of Calgary, Calgary, Alta.
[Ti] Título:The importance of cognitive map placement in bile duct injuries.
[So] Source:Can J Surg;60(6):424-425, 2017 Dec.
[Is] ISSN:1488-2310
[Cp] País de publicação:Canada
[La] Idioma:eng
[Ab] Resumo:SUMMARY: Bile duct injuries often occur because of surgeon spatial disorientation. The psychological concept of cognitive map misplacement is a useful explanation of how this disorientation and injury occurs. Surgeons may find that using a "bile duct time out" is a helpful way to orient. Based on the mnemonic B-SAFE, they can use 5 subhepatic landmarks (B, bile duct; S, sulcus of Rouviere; A, hepatic artery; F, umbilical fissure; E, enteric/duodenum) to correctly place their cognitive map.
[Mh] Termos MeSH primário: Ductos Biliares/anatomia & histologia
Ductos Biliares/lesões
Complicações Intraoperatórias/prevenção & controle
[Mh] Termos MeSH secundário: Cognição
Seres Humanos
Orientação Espacial
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171222
[Lr] Data última revisão:
171222
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171128
[St] Status:MEDLINE


  7 / 127 MEDLINE  
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[PMID]:29228140
[Au] Autor:Duncan J; Gosselin F; Cobarro C; Dugas G; Blais C; Fiset D
[Ad] Endereço:Department of Psychoeducation and Psychology, University of Québec in Outaouais, Gatineau, Canada.
[Ti] Título:Orientations for the successful categorization of facial expressions and their link with facial features.
[So] Source:J Vis;17(14):7, 2017 Dec 01.
[Is] ISSN:1534-7362
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Horizontal information was recently suggested to be crucial for face identification. In the present paper, we expand on this finding and investigate the role of orientations for all the basic facial expressions and neutrality. To this end, we developed orientation bubbles to quantify utilization of the orientation spectrum by the visual system in a facial expression categorization task. We first validated the procedure in Experiment 1 with a simple plaid-detection task. In Experiment 2, we used orientation bubbles to reveal the diagnostic-i.e., task relevant-orientations for the basic facial expressions and neutrality. Overall, we found that horizontal information was highly diagnostic for expressions-surprise excepted. We also found that utilization of horizontal information strongly predicted performance level in this task. Despite the recent surge of research on horizontals, the link with local features remains unexplored. We were thus also interested in investigating this link. In Experiment 3, location bubbles were used to reveal the diagnostic features for the basic facial expressions. Crucially, Experiments 2 and 3 were run in parallel on the same participants, in an interleaved fashion. This way, we were able to correlate individual orientation and local diagnostic profiles. Our results indicate that individual differences in horizontal tuning are best predicted by utilization of the eyes.
[Mh] Termos MeSH primário: Face/fisiologia
Expressão Facial
Orientação Espacial/fisiologia
Reconhecimento Visual de Modelos/fisiologia
[Mh] Termos MeSH secundário: Emoções
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171215
[Lr] Data última revisão:
171215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171212
[St] Status:MEDLINE
[do] DOI:10.1167/17.14.7


  8 / 127 MEDLINE  
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[PMID]:28747622
[Au] Autor:Su TS; Lee WJ; Huang YC; Wang CT; Lo CC
[Ad] Endereço:Institute of Systems Neuroscience, National Tsing Hua University, Hsinchu, 30013, Taiwan.
[Ti] Título:Coupled symmetric and asymmetric circuits underlying spatial orientation in fruit flies.
[So] Source:Nat Commun;8(1):139, 2017 07 26.
[Is] ISSN:2041-1723
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Maintaining spatial orientation when carrying out goal-directed movements requires an animal to perform angular path integration. Such functionality has been recently demonstrated in the ellipsoid body (EB) of fruit flies, though the precise circuitry and underlying mechanisms remain unclear. We analyze recently published cellular-level connectomic data and identify the unique characteristics of the EB circuitry, which features coupled symmetric and asymmetric rings. By constructing a spiking neural circuit model based on the connectome, we reveal that the symmetric ring initiates a feedback circuit that sustains persistent neural activity to encode information regarding spatial orientation, while the asymmetric rings are capable of integrating the angular path when the body rotates in the dark. The present model reproduces several key features of EB activity and makes experimentally testable predictions, providing new insight into how spatial orientation is maintained and tracked at the cellular level.Ellipsoid body (EB) neurons in the fruit fly represent the animal heading through a bump-like activity dynamics. Here the authors report a connectome-driven spiking neural circuit model of the EB and the protocerebral bridge (PB) that can maintain and update an activity bump related to the spatial orientation.
[Mh] Termos MeSH primário: Algoritmos
Drosophila/fisiologia
Modelos Neurológicos
Neurônios/fisiologia
Orientação Espacial/fisiologia
[Mh] Termos MeSH secundário: Potenciais de Ação/fisiologia
Animais
Encéfalo/citologia
Encéfalo/fisiologia
Conectoma
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171128
[Lr] Data última revisão:
171128
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170728
[St] Status:MEDLINE
[do] DOI:10.1038/s41467-017-00191-6


  9 / 127 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


  10 / 127 MEDLINE  
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[PMID]:28983570
[Au] Autor:Niehof N; Tramper JJ; Doeller CF; Medendorp WP
[Ad] Endereço:Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, The Netherlands.
[Ti] Título:Updating of visual orientation in a gravity-based reference frame.
[So] Source:J Vis;17(12):4, 2017 Oct 01.
[Is] ISSN:1534-7362
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The brain can use multiple reference frames to code line orientation, including head-, object-, and gravity-centered references. If these frames change orientation, their representations must be updated to keep register with actual line orientation. We tested this internal updating during head rotation in roll, exploiting the rod-and-frame effect: The illusory tilt of a vertical line surrounded by a tilted visual frame. If line orientation is stored relative to gravity, these distortions should also affect the updating process. Alternatively, if coding is head- or frame-centered, updating errors should be related to the changes in their orientation. Ten subjects were instructed to memorize the orientation of a briefly flashed line, surrounded by a tilted visual frame, then rotate their head, and subsequently judge the orientation of a second line relative to the memorized first while the frame was upright. Results showed that updating errors were mostly related to the amount of subjective distortion of gravity at both the initial and final head orientation, rather than to the amount of intervening head rotation. In some subjects, a smaller part of the updating error was also related to the change of visual frame orientation. We conclude that the brain relies primarily on a gravity-based reference to remember line orientation during head roll.
[Mh] Termos MeSH primário: Gravitação
Rememoração Mental/fisiologia
Orientação Espacial/fisiologia
Orientação/fisiologia
Percepção Espacial/fisiologia
[Mh] Termos MeSH secundário: Adulto
Feminino
Seres Humanos
Masculino
Propriocepção/fisiologia
Desempenho Psicomotor/fisiologia
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171018
[Lr] Data última revisão:
171018
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171007
[St] Status:MEDLINE
[do] DOI:10.1167/17.12.4



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