Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 15 de 15
Filtrar
1.
J Nerv Ment Dis ; 212(6): 325-331, 2024 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-38810095

RESUMO

ABSTRACT: Despite abundant literature on personality and stigma, the role of disability type in this relationship has remained unaddressed. In the current study, we examined whether the relationship between observers' openness to experience and agreeableness on the one hand, and social distance on the other, was moderated by the target person's type of disability (psychiatric vs. physical). One hundred thirty-nine participants were randomly assigned to complete a social distance questionnaire referring to a vignette of a person in three conditions (physical disability, psychiatric disability, and control). A main effect of openness on social distance was found. Additionally, we found an interaction effect of agreeableness and the type of disability. Namely, the relationship between agreeableness and social distance was significant only in the physical disability condition but not in the other two conditions. To conclude, the current study emphasizes the role of personality traits in social distance toward individuals with disabilities.


Assuntos
Pessoas com Deficiência , Personalidade , Distância Psicológica , Humanos , Masculino , Feminino , Adulto , Pessoas com Deficiência/psicologia , Personalidade/fisiologia , Adulto Jovem , Pessoa de Meia-Idade , Estigma Social , Inquéritos e Questionários , Adolescente
2.
Soc Psychiatry Psychiatr Epidemiol ; 59(10): 1685-1696, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-38193942

RESUMO

PURPOSE: The purpose of this study was to assess the trajectory of women's depressive symptoms during the first six months postpartum, identify risk factors (sociodemographic, obstetric and personality) associated with classes, and examine associations between classes and postpartum PTSD at two months and bonding at six months. METHODS: The final sample included 212 women who gave birth in the maternity wards of a large tertiary health center that were approached at 1-3 days, two months, and six months postpartum and completed a demographic questionnaire and measures of neuroticism (BFI) and postpartum depression (EPDS), postpartum PTSD (City Birth Trauma Scale) and bonding (PBQ). Obstetric data were taken from the medical files. RESULTS: Cluster analysis revealed three distinctive clusters: "stable-low" (64.2%), "transient-decreasing" (25.9%), and "stable-high" (9.9%). Neuroticism, general-related PTSD symptoms, and bonding were associated with differences between all trajectories. Birth-related PTSD symptoms were associated with differences between both stable-high and transient-decreasing trajectories and the stable-low trajectory. No obstetric or demographic variables were associated with differences between trajectories. CONCLUSION: We suggest that screening women for vulnerabilities such as high levels of neuroticism and offering treatment can alleviate the possible deleterious effects of high-symptom depression trajectories that may be associated with their vulnerability.


Assuntos
Depressão Pós-Parto , Transtornos de Estresse Pós-Traumáticos , Humanos , Feminino , Depressão Pós-Parto/epidemiologia , Depressão Pós-Parto/psicologia , Adulto , Fatores de Risco , Transtornos de Estresse Pós-Traumáticos/epidemiologia , Transtornos de Estresse Pós-Traumáticos/psicologia , Inquéritos e Questionários , Neuroticismo , Gravidez , Período Pós-Parto/psicologia , Apego ao Objeto , Análise por Conglomerados , Transtornos de Ansiedade/epidemiologia , Transtornos de Ansiedade/psicologia , Adulto Jovem , Escalas de Graduação Psiquiátrica
3.
Int J Behav Med ; 2024 Jun 17.
Artigo em Inglês | MEDLINE | ID: mdl-38886330

RESUMO

BACKGROUND: While past research detected a direct link between symptoms of fibromyalgia (FM) and psychological distress, body appreciation was suggested as a viable mediator of this link. The aim of the present study was to further develop an explanatory model for the effect of FM on women's psychological distress and identify possible protective and risk factors. Specifically, it was hypothesized that self-compassion would moderate the indirect effect of body appreciation and self-criticism on psychological distress in women with FM. METHOD: This study comprised a total of 293 women, aged 20-68 (M = 34.8, SD = 12.3), of whom 146 were women with FM and 147 were heathy controls. All the women completed questionnaires regarding demographic characteristics, depression (PHQ-9), anxiety (GAD-7), self-criticism (DEQ-SC), body appreciation (BAS2), and the self-compassion scale (SCS). RESULTS: A moderated serial mediation model demonstrated lower body appreciation in participants with FM compared to controls. These lower levels of body appreciation, together with lower levels of self-compassion, were associated with greater self-criticism and, consequently, higher levels of psychological distress. CONCLUSIONS: The results emphasize the role of self-compassion as a protective mechanism against psychological distress among women with FM. Future studies should further investigate the effect of self-compassion-focused interventions on patients with FM.

4.
J Neurosci ; 37(45): 10894-10903, 2017 11 08.
Artigo em Inglês | MEDLINE | ID: mdl-29118219

RESUMO

Optogenetics is the use of genetically coded, light-gated ion channels or pumps (opsins) for millisecond resolution control of neural activity. By targeting opsin expression to specific cell types and neuronal pathways, optogenetics can expand our understanding of the neural basis of normal and pathological behavior. To maximize the potential of optogenetics to study human cognition and behavior, optogenetics should be applied to the study of nonhuman primates (NHPs). The homology between NHPs and humans makes these animals the best experimental model for understanding human brain function and dysfunction. Moreover, for genetic tools to have translational promise, their use must be demonstrated effectively in large, wild-type animals such as Rhesus macaques. Here, we review recent advances in primate optogenetics. We highlight the technical hurdles that have been cleared, challenges that remain, and summarize how optogenetic experiments are expanding our understanding of primate brain function.


Assuntos
Encéfalo/fisiologia , Optogenética/métodos , Optogenética/tendências , Primatas/fisiologia , Animais , Humanos , Neurologia/métodos , Neurologia/tendências , Optogenética/instrumentação
5.
J Neurosci ; 33(42): 16684-97, 2013 Oct 16.
Artigo em Inglês | MEDLINE | ID: mdl-24133271

RESUMO

Recent studies have demonstrated that strong neural modulations can be evoked with optogenetic stimulation in macaque motor cortex without observing any evoked movements (Han et al., 2009, 2011; Diester et al., 2011). It remains unclear why such perturbations do not generate movements and if conditions exist under which they may evoke movements. In this study, we examine the effects of five optogenetic constructs in the macaque frontal eye field and use electrical microstimulation to assess whether optical perturbation of the local network leads to observable motor changes during optical, electrical, and combined stimulation. We report a significant increase in the probability of evoking saccadic eye movements when low current electrical stimulation is coupled to optical stimulation compared with when electrical stimulation is used alone. Experiments combining channelrhodopsin 2 (ChR2) and electrical stimulation with simultaneous fMRI revealed no discernible fMRI activity at the electrode tip with optical stimulation but strong activity with electrical stimulation. Our findings suggest that stimulation with current ChR2 optogenetic constructs generates subthreshold activity that contributes to the initiation of movements but, in most cases, is not sufficient to evoke a motor response.


Assuntos
Córtex Motor/fisiologia , Movimentos Sacádicos/fisiologia , Campos Visuais/fisiologia , Animais , Mapeamento Encefálico , Estimulação Elétrica , Macaca , Imageamento por Ressonância Magnética , Masculino , Estimulação Luminosa
6.
J Neurophysiol ; 104(1): 108-18, 2010 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-20427617

RESUMO

It is well established that the optic tectum (or its mammalian homologue, the superior colliculus) is involved in directing gaze toward salient stimuli. However, salient stimuli typically induce orienting responses beyond gaze shifts. The role of the optic tectum in generating responses such as pupil dilation, galvanic responses, or covert shifts is not clear. In the present work, we studied the effects of microstimulation in the optic tectum of the barn owl (Tyto alba) on pupil diameter and on eye shifts. Experiments were conducted in lightly anesthetized head-restrained barn owls. We report that low-level microstimulation in the deep layers of the optic tectum readily induced pupil dilation responses (PDRs), as well as small eye movements. Electrically evoked PDRs, similar to acoustically evoked PDRs, were long-lasting and habituated to repeated stimuli. We further show that microstimulation in the external nucleus of the inferior colliculus also induced PDRs. Finally, in experiments in which tectal microstimulations were coupled with acoustic stimuli, we show a tendency of the microstimulation to enhance pupil responses and eye shifts to previously habituated acoustic stimuli. The enhancement was dependent on the site of stimulation in the tectal spatial map; responses to sounds with spatial cues that matched the site of stimulation were more enhanced compared with sounds with spatial cues that did not match. These results suggest that the optic tectum is directly involved in autonomic orienting reflexes as well as in gaze shifts, highlighting the central role of the optic tectum in mediating the body responses to salient stimuli.


Assuntos
Movimentos Oculares/fisiologia , Reflexo Pupilar/fisiologia , Sensação/fisiologia , Estrigiformes/fisiologia , Colículos Superiores/fisiologia , Estimulação Acústica , Animais , Sistema Nervoso Autônomo/fisiologia , Interpretação Estatística de Dados , Estimulação Elétrica , Eletrodos Implantados , Fenômenos Eletrofisiológicos , Colículos Inferiores/fisiologia , Microeletrodos , Vias Neurais/fisiologia , Orientação/fisiologia , Técnicas Estereotáxicas
7.
Psychiatry Res ; 292: 113311, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32712449

RESUMO

Cognitive impairments characterize individuals with schizophrenia, and are correlated to the patients' functional outcome. The transcription factor Cyclic AMP-responsive element-binding protein-1 (CREB1) is involved in learning and memory processes. CREB1 and both CREB-binding protein (CREBBP) and E1A Binding Protein P300 (EP300), co-activators of CREB1, have been associated with schizophrenia. We performed a systematic meta-analysis of CREB1, CREBBP and EP300 differential expression in post mortem Brodmann Area 10 (BA10) samples of patients with schizophrenia vs. healthy controls, following the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines. Two microarray datasets met the inclusion criteria (overall 41 schizophrenia samples and 38 controls were analyzed). We detect up-regulation of CREB1 and CREBBP in BA10 samples of patients with schizophrenia, while EP300 wasn't differentially expressed. The integration of two independent datasets and the positive correlation between the expression patterns of CREB1 and CREBBP increase the validity of the results. The up-regulation of CREB1 and its co-activator CREBBP might relate to BA10 altered activation that has been shown in schizophrenia. As BA10 was shown to be involved in the cognitive impairments associated with schizophrenia, this suggests involvement of CREB1 and CREBBP in the cognitive symptoms that characterize the disease.


Assuntos
Proteína de Ligação a CREB/biossíntese , Proteína de Ligação a CREB/genética , Proteína de Ligação ao Elemento de Resposta ao AMP Cíclico/biossíntese , Proteína de Ligação ao Elemento de Resposta ao AMP Cíclico/genética , Córtex Pré-Frontal/metabolismo , Esquizofrenia/genética , Esquizofrenia/metabolismo , Bases de Dados Genéticas/tendências , Expressão Gênica/fisiologia , Regulação da Expressão Gênica/fisiologia , Humanos , Córtex Pré-Frontal/patologia , Esquizofrenia/patologia , Regulação para Cima/fisiologia
8.
Biomed Opt Express ; 9(4): 1492-1509, 2018 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-29675297

RESUMO

A major open challenge in neuroscience is the ability to measure and perturb neural activity in vivo from well defined neural sub-populations at cellular resolution anywhere in the brain. However, limitations posed by scattering and absorption prohibit non-invasive multi-photon approaches for deep (>2mm) structures, while gradient refractive index (GRIN) endoscopes are relatively thick and can cause significant damage upon insertion. Here, we present a novel micro-endoscope design to image neural activity at arbitrary depths via an ultra-thin multi-mode optical fiber (MMF) probe that has 5-10X thinner diameter than commercially available micro-endoscopes. We demonstrate micron-scale resolution, multi-spectral and volumetric imaging. In contrast to previous approaches, we show that this method has an improved acquisition speed that is sufficient to capture rapid neuronal dynamics in-vivo in rodents expressing a genetically encoded calcium indicator (GCaMP). Our results emphasize the potential of this technology in neuroscience applications and open up possibilities for cellular resolution imaging in previously unreachable brain regions.

9.
J Neural Eng ; 14(4): 045003, 2017 08.
Artigo em Inglês | MEDLINE | ID: mdl-28169219

RESUMO

OBJECTIVE: Closed-loop experiments, in which causal interventions are conditioned on the state of the system under investigation, have become increasingly common in neuroscience. Such experiments can have a high degree of explanatory power, but they require a precise implementation that can be difficult to replicate across laboratories. We sought to overcome this limitation by building open-source software that makes it easier to develop and share algorithms for closed-loop control. APPROACH: We created the Open Ephys GUI, an open-source platform for multichannel electrophysiology experiments. In addition to the standard 'open-loop' visualization and recording functionality, the GUI also includes modules for delivering feedback in response to events detected in the incoming data stream. Importantly, these modules can be built and shared as plugins, which makes it possible for users to extend the functionality of the GUI through a simple API, without having to understand the inner workings of the entire application. MAIN RESULTS: In combination with low-cost, open-source hardware for amplifying and digitizing neural signals, the GUI has been used for closed-loop experiments that perturb the hippocampal theta rhythm in a phase-specific manner. SIGNIFICANCE: The Open Ephys GUI is the first widely used application for multichannel electrophysiology that leverages a plugin-based workflow. We hope that it will lower the barrier to entry for electrophysiologists who wish to incorporate real-time feedback into their research.


Assuntos
Algoritmos , Desenho de Equipamento/métodos , Hipocampo/fisiologia , Design de Software , Interface Usuário-Computador , Fenômenos Eletrofisiológicos/fisiologia , Desenho de Equipamento/instrumentação , Humanos , Neurociências/instrumentação , Neurociências/métodos
10.
Neuron ; 79(4): 766-81, 2013 Aug 21.
Artigo em Inglês | MEDLINE | ID: mdl-23891401

RESUMO

Spatial navigation is a complex process, but one that is essential for any mobile organism. We localized a region in the macaque occipitotemporal sulcus that responds preferentially to images of scenes. Single-unit recording revealed that this region, which we term the lateral place patch (LPP), contained a large concentration of scene-selective single units. These units were not modulated by spatial layout alone but were instead modulated by a combination of spatial and nonspatial factors, with individual units coding specific scene parts. We further demonstrate by microstimulation that LPP is connected with extrastriate visual areas V4V and DP and a scene-selective medial place patch in the parahippocampal gyrus, revealing a ventral network for visual scene processing in the macaque.


Assuntos
Mapeamento Encefálico , Reconhecimento Visual de Modelos/fisiologia , Lobo Temporal/fisiologia , Vias Visuais/fisiologia , Potenciais de Ação/fisiologia , Animais , Humanos , Processamento de Imagem Assistida por Computador , Macaca mulatta , Imageamento por Ressonância Magnética , Neurônios/fisiologia , Oxigênio/sangue , Estimulação Luminosa , Lobo Temporal/irrigação sanguínea , Lobo Temporal/citologia , Vias Visuais/irrigação sanguínea
11.
J Neurosci Methods ; 219(1): 10-9, 2013 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-23810825

RESUMO

A quantitative description of animal social behaviour is informative for behavioural biologists and clinicians developing drugs to treat social disorders. Social interaction in a group of animals has been difficult to measure because behaviour develops over long periods of time and requires tedious manual scoring, which is subjective and often non-reproducible. Computer-vision systems with the ability to measure complex social behaviour automatically would have a transformative impact on biology. Here, we present a method for tracking group-housed mice individually as they freely interact over multiple days. Each mouse is bleach-marked with a unique fur pattern. The patterns are automatically learned by the tracking software and used to infer identities. Trajectories are analysed to measure behaviour as it develops over days, beyond the range of acute experiments. We demonstrate how our system may be used to study the development of place preferences, associations and social relationships by tracking four mice continuously for five days. Our system enables accurate and reproducible characterisation of wild-type mouse social behaviour and paves the way for high-throughput long-term observation of the effects of genetic, pharmacological and environmental manipulations.


Assuntos
Comportamento Animal/fisiologia , Pesquisa Comportamental/métodos , Comportamento Social , Algoritmos , Animais , Automação , Pesquisa Comportamental/instrumentação , Interpretação Estatística de Dados , Feminino , Cabelo/fisiologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Reprodutibilidade dos Testes , Caracteres Sexuais
12.
J Neurosci Methods ; 204(2): 389-97, 2012 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-22192950

RESUMO

Functional magnetic resonance imaging allows precise localization of brain regions specialized for different perceptual and higher cognitive functions. However, targeting these deep brain structures for electrophysiology still remains a challenging task. Here, we propose a novel framework for MRI-stereotactic registration and chamber placement for precise electrode guidance to recording sites defined in MRI space. The proposed "floating frame" approach can be used without usage of ear bars, greatly reducing pain and discomfort common in standard stereotactic surgeries. Custom pre-surgery planning software was developed to automatically solve the registration problem and report the set of parameters needed to position a stereotactic manipulator to reach a recording site along arbitrary, non-vertical trajectories. Furthermore, the software can automatically identify blood vessels and assist in finding safe trajectories to targets. Our approach was validated by targeting different regions in macaque monkeys and rats. We expect that our method will facilitate recording in new brain areas and provide a valuable tool for electrophysiologists.


Assuntos
Mapeamento Encefálico/instrumentação , Encéfalo/fisiologia , Eletrofisiologia/instrumentação , Imageamento por Ressonância Magnética , Técnicas Estereotáxicas , Animais , Encéfalo/cirurgia , Mapeamento Encefálico/métodos , Eletrodos , Eletrofisiologia/métodos , Processamento de Imagem Assistida por Computador , Macaca mulatta , Masculino , Valor Preditivo dos Testes , Ratos , Reprodutibilidade dos Testes , Cirurgia Assistida por Computador/métodos
13.
Neuron ; 74(3): 567-81, 2012 May 10.
Artigo em Inglês | MEDLINE | ID: mdl-22578507

RESUMO

Faces are robustly detected by computer vision algorithms that search for characteristic coarse contrast features. Here, we investigated whether face-selective cells in the primate brain exploit contrast features as well. We recorded from face-selective neurons in macaque inferotemporal cortex, while presenting a face-like collage of regions whose luminances were changed randomly. Modulating contrast combinations between regions induced activity changes ranging from no response to a response greater than that to a real face in 50% of cells. The critical stimulus factor determining response magnitude was contrast polarity, for example, nose region brighter than left eye. Contrast polarity preferences were consistent across cells, suggesting a common computational strategy across the population, and matched features used by computer vision algorithms for face detection. Furthermore, most cells were tuned both for contrast polarity and for the geometry of facial features, suggesting cells encode information useful both for detection and recognition.


Assuntos
Sensibilidades de Contraste/fisiologia , Face , Neurônios/fisiologia , Reconhecimento Visual de Modelos/fisiologia , Córtex Visual/citologia , Potenciais de Ação/fisiologia , Algoritmos , Animais , Mapeamento Encefálico , Macaca mulatta , Masculino , Estimulação Luminosa
14.
Biol Cybern ; 98(2): 115-32, 2008 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-18066583

RESUMO

In this study we investigated visual attention properties of freely behaving barn owls, using a miniature wireless camera attached to their heads. The tubular eye structure of barn owls makes them ideal subjects for this research since it limits their eye movements. Video sequences recorded from the owl's point of view capture part of the visual scene as seen by the owl. Automated analysis of video sequences revealed that during an active search task, owls repeatedly and consistently direct their gaze in a way that brings objects of interest to a specific retinal location (retinal fixation area). Using a projective model that captures the geometry between the eye and the camera, we recovered the corresponding location in the recorded images (image fixation area). Recording in various types of environments (aviary, office, outdoors) revealed significant statistical differences of low level image properties at the image fixation area compared to values extracted at random image patches. These differences are in agreement with results obtained in primates in similar studies. To investigate the role of saliency and its contribution to drawing the owl's attention, we used a popular bottom-up computational model. Saliency values at the image fixation area were typically greater than at random patches, yet were only 20% out of the maximal saliency value, suggesting a top-down modulation of gaze control.


Assuntos
Atenção/fisiologia , Movimentos Oculares/fisiologia , Olho , Redes Neurais de Computação , Percepção Espacial/fisiologia , Visão Ocular/fisiologia , Algoritmos , Animais , Comportamento Animal , Limiar Diferencial , Fixação Ocular , Modelos Neurológicos , Reconhecimento Automatizado de Padrão/métodos , Estimulação Luminosa/métodos , Estrigiformes
15.
Artigo em Inglês | MEDLINE | ID: mdl-16703390

RESUMO

Barn owls exhibit a rich repertoire of head movements before taking off for prey capture. These movements occur mainly at light levels that allow for the visual detection of prey. To investigate these movements and their functional relevance, we filmed the pre-attack behavior of barn owls. Off-line image analysis enabled reconstruction of all six degrees of freedom of head movements. Three categories of head movements were observed: fixations, head translations and head rotations. The observed rotations contained a translational component. Head rotations did not follow Listing's law, but could be well described by a second-order surface, which indicated that they are in close agreement with Donder's law. Head translations did not contain any significant rotational components. Translations were further segmented into straight-line and curved paths. Translations along an axis perpendicular to the line of sight were similar to peering movements observed in other animals. We suggest that these basic motion elements (fixations, head rotations, translations along a straight line, and translation along a curved trajectory) may be combined to form longer and more complex behavior. We speculate that these head movements mainly underlie estimation of distance during prey capture.


Assuntos
Comportamento Animal/fisiologia , Movimentos da Cabeça , Comportamento Predatório/fisiologia , Estrigiformes/fisiologia , Percepção Visual/fisiologia , Animais , Fixação Ocular/fisiologia , Masculino , Atividade Motora/fisiologia
SELEÇÃO DE REFERÊNCIAS
Detalhe da pesquisa