Representations of object animacy and real-world size in the ventral visual pathway / 生理学报

How the brain perceives objects and classifies perceived objects is one of the important goals of visual cognitive neuroscience. Previous research has shown that when we see objects, the brain's ventral visual pathway recognizes and classifies them, leading to different ways of interacting with them. In this paper, we summarize the latest research progress of the ventral visual pathway related to the visual classification of objects. From the perspective of the neural representation of objects and its underlying mechanisms in the visual cortex, we summarize the current research status of the two important organizational dimensions of object animacy and real-world size, provide new insights, and point out the direction of further research.

Human detection and motion recovery based on monocular vision / Detecção humana e recuperação de movimento com base na visão monocular / Detección humana y recuperación de movimiento basada en visión monocular

ABSTRACT Objective: Provides interactive games and human animation real motion data and technical options. Therefore, how to complete the position, attitude detection, and motion recovery under monocular vision has become an important research direction. Methods: This paper improves the part-based human detection algorithm and uses the AdaBoost multi-instance learning algorithm to train the part detector. Results: The results show that obtaining blood pressure waveform based on monocular vision pulse wave is feasible and has generalization. Conclusions: The results show the feasibility and accuracy of the gait motion detection, motion recovery and analysis system for human lower limbs based on monocular vision. Level of evidence II; Therapeutic studies - investigation of treatment results.

RESUMO Objetivo: Fornece jogos interativos e dados de movimento real de animação humana e opções técnicas. Portanto, como completar a posição, detecção de atitude e recuperação de movimento sob visão monocular tornou-se uma importante direção de pesquisa. Métodos: este artigo aprimora o algoritmo de detecção humana baseado em partes e usa o algoritmo de aprendizado de múltiplas instâncias AdaBoost para treinar o detector de partes. Resultados: Os resultados mostram que o método de obtenção da forma de onda da pressão arterial com base na onda de pulso de visão monocular é viável e se pode generalizar. Conclusões: Os resultados mostram a viabilidade e precisão do sistema de detecção, recuperação e análise do movimento da marcha para membros inferiores humanos com base na visão monocular. Nível de evidência II; Estudos terapêuticos- investigação dos resultados do tratamento.

RESUMEN Objetivo: Proporciona juegos interactivos y animación humana, datos de movimiento real y opciones técnicas. Por lo tanto, cómo completar la posición, la detección de actitud y la recuperación de movimiento bajo visión monocular se ha convertido en una importante dirección de investigación. Métodos: este documento mejora el algoritmo de detección humana basado en piezas y utiliza el algoritmo de aprendizaje de instancias múltiples AdaBoost para entrenar el detector de piezas. Resultados: Los resultados muestran que el método de obtención de la forma de onda de la presión arterial basado en la onda de pulso de visión monocular es factible y se puede generalizar. Conclusiones: Los resultados muestran la viabilidad y precisión del sistema de detección, recuperación y análisis del movimiento de la marcha para miembros inferiores humanos basado en visión monocular. Nivel de evidencia II; Estudios terapéuticos- investigación de los resultados del tratamiento.

Topography of Visual Features in the Human Ventral Visual Pathway / 神经科学通报·英文版

Visual object recognition in humans and nonhuman primates is achieved by the ventral visual pathway (ventral occipital-temporal cortex, VOTC), which shows a well-documented object domain structure. An on-going question is what type of information is processed in the higher-order VOTC that underlies such observations, with recent evidence suggesting effects of certain visual features. Combining computational vision models, fMRI experiment using a parametric-modulation approach, and natural image statistics of common objects, we depicted the neural distribution of a comprehensive set of visual features in the VOTC, identifying voxel sensitivities with specific feature sets across geometry/shape, Fourier power, and color. The visual feature combination pattern in the VOTC is significantly explained by their relationships to different types of response-action computation (fight-or-flight, navigation, and manipulation), as derived from behavioral ratings and natural image statistics. These results offer a comprehensive visual feature map in the VOTC and a plausible theoretical explanation as a mapping onto different types of downstream response-action systems.

Intragroup differences and similarities in performance on rapid automatized naming tasks in children with ADHD symptoms, children with reading disabilities, and controls

Abstract Introduction Rapid automatized naming (RAN) is the ability to name, as fast as possible, symbols such as letters, digits and figures. The present study aimed to investigate intragroup performance patterns on RAN tasks in children with attention deficit hyperactivity disorder (ADHD) symptoms alone, children with reading disability (RD) alone and controls with typical development. Methods A total of 216 Brazilian children between 8 to 11 years old were selected from public schools located in two Brazilian capitals, namely Porto Alegre and Belo Horizonte, to participate in the study. Mixed 3 (participant group: ADHD symptoms, RD or control group) × 3 (type of stimulus: letters, numbers or figures) ANOVAs were performed using response time and number of errors as dependent variables. Only intragroup comparisons are described in this paper. Results The groups with ADHD symptoms and RD showed similar performance results on naming speed. There were no differences between letters and numbers within each group, but we found slower responses in figure naming compared to the other tasks for both groups. Concerning accuracy, children with ADHD symptoms showed a similar number of errors in all three tasks. These patterns were distinct from the performance of the control group. Conclusion Results suggest a shared deficit in naming speed of alphanumeric stimuli in children with ADHD symptoms and those with RD, and impairments in naming digits correctly in children with ADHD symptoms.

Research of gnostic functions in the elderly people suffering from dementia

The study was aimed at investigating the features of gnostic functions in the elderly people suffering from dementia. To implement the objectives of the study and to solve the set tasks, the following methods were used: visual gnosis tests (recognition of images, the selection of three subject pictures, selecting parts of a whole, etc.), the acoustic gnosis tests (score and perception of rhythms, recognition of nonspeech sounds), and tactile gnosis tests (tactile identification, Teuber test, Foerster test). When running the visual gnosis tests, the elderly people with the dementia diseases slowly initiated the tasks, made numerous errors, and sometimes could not cope with the tasks at all. Also, the perception integrity disorders, the presence of fragmentation, lack of accuracy, differentiation, preservation of specific objective images-objects, and the violation in the understanding of the spatial arrangement of things were revealed. When performing the auditory-motor coordination tests, the elderly people suffering from dementia needed more time to listen to, they asked for the repeated sound representation, and there were often errors in the rhythmic structure reproduction. When performing the tactile gnosis tests, the elderly people suffering from dementia had difficulties in identifying the subject by touch, in understanding the right and left-sided spatial relationships, and also made errors in recognizing one of the touches when the experimenter touched their hands. Based on the study results, the recommendations have been developed for the preservation and improvement of the existing gnostic functions' disorders in the elderly people suffering from dementia. The recommendations are complex, and they can also be useful for the medical staff whose professional activity is directly related to the elderly people suffering from dementia, their relatives and the persons closest to them.

The neural mechanism of visual contour integration / 生理学报

The human visual system efficiently extracts local elements from cluttered backgrounds and integrates these elements into meaningful contour perception. This process is a critical step before object recognition, in which contours often play an important role in defining the shapes and borders of the to-be-recognized objects. However, the neural mechanism of the contour integration is still under debate. The investigation of the neural mechanism underlying contour integration could deepen our understanding of perceptual grouping in the human visual system and advance the development of the algorithms for image grouping and segmentation in computer vision. Here, we review two theoretical frameworks that were proposed over the past decades. The first framework is based on hardwired horizontal connection in primary visual cortex, while the second one emphasizes the role of recurrent connections within intra- and inter-areas. At the end of review, we also raise the unsolved issues that need to be addressed in future studies.

Classification of radiographic lung pattern based on texture analysis and machine learning

This study evaluated the feasibility of using texture analysis and machine learning to distinguish radiographic lung patterns. A total of 1200 regions of interest (ROIs) including four specific lung patterns (normal, alveolar, bronchial, and unstructured interstitial) were obtained from 512 thoracic radiographs of 252 dogs and 65 cats. Forty-four texture parameters based on eight methods of texture analysis (first-order statistics, spatial gray-level-dependence matrices, gray-level-difference statistics, gray-level run length image statistics, neighborhood gray-tone difference matrices, fractal dimension texture analysis, Fourier power spectrum, and Law's texture energy measures) were used to extract textural features from the ROIs. The texture parameters of each lung pattern were compared and used for training and testing of artificial neural networks. Classification performance was evaluated by calculating accuracy and the area under the receiver operating characteristic curve (AUC). Forty texture parameters showed significant differences between the lung patterns. The accuracy of lung pattern classification was 99.1% in the training dataset and 91.9% in the testing dataset. The AUCs were above 0.98 in the training set and above 0.92 in the testing dataset. Texture analysis and machine learning algorithms may potentially facilitate the evaluation of medical images.

Validation of the Mnemonic Similarity Task - Context Version

Objective: Pattern separation (PS) is the ability to represent similar experiences as separate, non-overlapping representations. It is usually assessed via the Mnemonic Similarity Task - Object Version (MST-O) which, however, assesses PS performance without taking behavioral context discrimination into account, since it is based on pictures of everyday simple objects on a white background. We here present a validation study for a new task, the Mnemonic Similarity Task - Context Version (MST-C), which is designed to measure PS while taking behavioral context discrimination into account by using real-life context photographs. Methods: Fifty healthy subjects underwent the two MST tasks to assess convergent evidence. Instruments assessing memory and attention were also administered to study discriminant evidence. The test-retest reliability of MST-C was analyzed. Results: Weak evidence supports convergent validity between the MST-C task and the MST-O as measures of PS (rs = 0.464; p < 0.01); PS performance assessed via the MST-C did not correlate with memory or attention; a moderate test-retest reliability was found (rs = 0.595; p < 0.01). Conclusion: The MST-C seems useful for assessing PS performance conceptualized as the ability to discriminate complex and realistic spatial contexts. Future studies are welcome to evaluate the validity of the MST-C task as a measure of PS in clinical populations.

Vernier But Not Grating Acuity Contributes to an Early Stage of Visual Word Processing / 神经科学通报·英文版

The process of reading words depends heavily on efficient visual skills, including analyzing and decomposing basic visual features. Surprisingly, previous reading-related studies have almost exclusively focused on gross aspects of visual skills, while only very few have investigated the role of finer skills. The present study filled this gap and examined the relations of two finer visual skills measured by grating acuity (the ability to resolve periodic luminance variations across space) and Vernier acuity (the ability to detect/discriminate relative locations of features) to Chinese character-processing as measured by character form-matching and lexical decision tasks in skilled adult readers. The results showed that Vernier acuity was significantly correlated with performance in character form-matching but not visual symbol form-matching, while no correlation was found between grating acuity and character processing. Interestingly, we found no correlation of the two visual skills with lexical decision performance. These findings provide for the first time empirical evidence that the finer visual skills, particularly as reflected in Vernier acuity, may directly contribute to an early stage of hierarchical word processing.

Contrast Visual Evoked Potentials under Pattern Stimulus in Ocular Trauma / 法医学杂志

OBJECTIVES@#To study the characteristic of contrast visual evoked potentials （CVEP） in patients with ocular trauma.@*METHODS@#Sixty patients defined as ocular trauma by forensic clinical examination in our center were selected, and split into 0.2-0.3 （Group A）, 0.3-0.5 （Group B） and ≥0.5 （Group C） according to the best corrected visual acuity. The variation characteristics of wave amplitude and latency of CVEP under 100%, 25% and 10% contrast were observed and analyzed statistically.@*RESULTS@#（1） Under the same contrast, the wave amplitude of P₁₀₀ decreased with the decrease of stimulus perspective. （2） Under the same stimulus perspective, the wave amplitude of P₁₀₀ decreased with the decrease of contrast （P<0.05）. （3） Under the contrast of 100% and 25% with the same stimulus perspective （except 100% 7' perspective stimulus）, the difference between group A and group B had no statistical significance （P>0.05）. Between group A and group C, group B and group C, the wave amplitude of P₁₀₀ gradually increased with the increase of vision （P<0.05）. Under the contrast of 10% with 15' stimulus perspective, the wave amplitude of P₁₀₀ increased with the increase of vision （P<0.05）. （4） Under the same contrast with the same stimulation perspective, the latency of P₁₀₀ wave shortened with the increase of vision, while the difference had no statistical significance （P>0.05）. Under the same stimulus perspective, the latency of P₁₀₀ wave was prolonged with the decrease of contrast （P>0.05）.@*CONCLUSIONS@#CVEP may become one of the possible methods for the evaluation of contrast visual acuity.

Elaboração de lista de homônimos do Português Brasileiro para tarefas de processamento linguístico / Creation of a list of homonyms in Brazilian Portuguese for linguistic processing tasks

RESUMO Objetivo Apresentar procedimentos e etapas de elaboração de uma lista de homônimos, de seus significados e de imagens que os representam. Método Levantaram-se, por meio de pesquisa em livros escolares e dicionários, 103 homônimos do Português Brasileiro e seus significados. Os homônimos foram selecionados por critérios: serem substantivos; não eliciar mais que dois significados; representáveis por imagens. Selecionaram-se 26 homônimos e foram encontradas 2 imagens para cada significado. Para testar o instrumento participaram 20 crianças do 4º (N=10) e 5º anos (N=10) do Ensino Fundamental de escola particular do município de São Paulo. Para identificar os significados de maior e menor ocorrência, os escolares referiram o significado de cada palavra que lhes foi apresentada oralmente. Para verificar o reconhecimento das 52 imagens (uma imagem para cada um dos dois significados do homônimo), as 20 crianças foram instruídas a nomeá-las na apresentação em PowerPoint. As porcentagens de acertos foram calculadas. Resultados Dos 26 homônimos, dois foram excluídos, pois não houve nomeação para os significados. Duas imagens pouco reconhecidas foram substituídas por outras que melhor representaram os homônimos. Conclusão A lista de homônimos resultante apresenta 24 homônimos e 48 imagens (uma para o significado de maior e outra para o de menor ocorrência). A apresentação dos itens a escolares de 4o. e 5o. anos do EF indicou adequação da lista. O material mostrou-se reconhecível e apropriado para tarefas de priming semântico ou outras de processamento linguístico com homônimos em Português Brasileiro.

ABSTRACT Purpose This paper presents procedures and steps to create a list of homonyms, their meanings and representative images. Methods One hundred and three homonyms in Brazilian Portuguese were secluded through searches in text books and dictionaries and the meanings were verified. The homonyms were analyzed and selected according pre-established criteria. Twenty-six homonyms with two meanings were selected and one image was used to represent each meaning. To test the instrument, twenty elementary school children in 4th (n = 10) and 5ht (n = 10) grades were selected from a private school in São Paulo. To identify the meanings of major and minor occurrence, the students gave their understanding of the words presented to them orally. The students were also asked to name the fifty-two images to determine the degree of recognition. Percentages of accuracy were calculated. Results Among the 26 homonyms, two were excluded because the students were unable to name them. Two images were little recognized and, therefore, replaced with others that better represented the homonyms. Conclusion A list of 24 homonyms and 48 images (one for each meaning) was developed. The results of the presentation of these items to elementary school children in the 4th and 5th grades proved the adequacy of the list. The material is seen as efficient for use in recognition tasks and can be applied in semantic priming tasks.

Faces of the Face

No abstract available.

Identifying fear-evoking pictures from the International Affective Picture System (IAPS) in a Chilean sample / Identificando un conjunto de imágenes provocadoras de miedo del International Affective Picture System (IAPS) en una muestra chilena

the goal of this study was to identify a valid set of fear-evoking pictures from IAPS images (Lang, Bradley, & Cuthbert, 2008) in a Chilean Sample. To do so, categorical and dimensional ratings of pictures made by our participants were analyzed, considering potential sex differences. We also evaluated potential transcultural differences by comparing our results with the results of Barke, Stahl, & Kröner-Herwig (2012), whose methodology was followed in the present study, but incorporating new statistical criteria for the valid identification of pictures that evoke fear. Sixty Chilean volunteers (30 women) with a mean age of 22.3 years rated 146 pictures of the LAPS regarding to the choice of discrete emotions and the ratings of valence, arousal and dominance. Six pictures were identified that evoked fear significantly more than any other emotion. Compared to the German sample, the Chilean group evaluated images with more arousal and valence.

El objetivo del presente estudio fue identificar, en una muestra chilena, un conjunto válido de imágenes provocadoras de miedo a partir de un conjunto de imágenes del IAPS (Lang, Bradley, & Cuthbert, 2008). Para ello, se analizaron las calificaciones categoriales y dimensionales de las imágenes observadas por 60 participantes, evaluando la existencia de diferencias en función del sexo del examinado. Asimismo, se estudiaron posibles diferencias transculturales, comparando los resultados obtenidos con los hallazgos de Barke, Stahl y Kröner-Herwig (2012), cuya metodología fue similar a la utilizada en este trabajo. Así, 60 voluntarios chilenos (30 mujeres) con una media de 22,3 años, puntuaron 146 imágenes del IAPS respecto a la elección de las emociones y las calificaciones de valencia, excitación y dominio. Se identificaron seis imágenes que provocaron más miedo que cualquier otra emoción. En comparación con la muestra alemana, el grupo chileno evaluó las imágenes con mayor excitación y valencia.

The incidental binding of color and shape is insensitive to the perceptual load

Abstract The binding of information in visual short-term memory may occur incidentally when irrelevant information for the task at hand is stored together with relevant information. We investigated the process of the incidental conjunction of color and shape (Exp1) and its potential association with the selection of relevant information to the memory task (Exp2). The results in Exp1 show that color and shape are incidentally and asymmetrically conjugated: color interferes with the recognition of shape; however, shape does not interfere with the recognition of color. In Exp2, we investigated whether an increase in perceptual load would eliminate the processing of irrelevant information. The results of this experiment show that even with a high perceptual load, the incidental conjunction is not affected, and color remains to interfere with shape recognition, suggesting that the incidental conjunction is an automatic process. (AU)

A imagem da ciência e as imagens visuais na formação superior e as pesquisas sobre o ensino de física / The image of science and visual images in higher education and research on physics teaching

Nesse estudo apresentamos, primeiramente, aspectos dos processos de mudança de paradigma que ocorrem nas ciênciasnaturais e suas influências nos manuais didáticos (KUHN, 2005).Em seguida, expomos resultados de um levantamento acerca de pesquisas que abordam imagens fixas no ensino de Física, buscando compreender o que tem sido considerado importante em seu uso, em especial, nos livros didáticos. Dos artigos analisados pelo presente trabalho, percebemos uma carência na discussão sobre osparadigmas da ciência transmitidos por meio de imagens em livros didáticos de Física. Pensamos ser essa uma reflexão importante, uma vez que trata da visão de mundo da ciência com que estudantes entram em contato em sua formação acadêmica e que, de alguma forma, influenciará sua atuação na vida.

Differential effects of aging on spatial contrast sensitivity to linear and polar sine-wave gratings

Changes in visual function beyond high-contrast acuity are known to take place during normal aging. We determined whether sensitivity to linear sine-wave gratings and to an elementary stimulus preferentially processed in extrastriate areas could be distinctively affected by aging. We measured spatial contrast sensitivity twice for concentric polar (Bessel) and vertical linear gratings of 0.6, 2.5, 5, and 20 cycles per degree (cpd) in two age groups (20-30 and 60-70 years). All participants were free of identifiable ocular disease and had normal or corrected-to-normal visual acuity. Participants were more sensitive to Cartesian than to polar gratings in all frequencies tested, and the younger adult group was more sensitive to all stimuli tested. Significant differences between sensitivities of the two groups were found for linear (only 20 cpd; P<0.01) and polar gratings (all frequencies tested; P<0.01). The young adult group was significantly more sensitive to linear than to circular gratings in the 20 cpd frequency. The older adult group was significantly more sensitive to linear than to circular gratings in all spatial frequencies, except in the 20 cpd frequency. The results suggest that sensitivity to the two kinds of stimuli is affected differently by aging. We suggest that neural changes in the aging brain are important determinants of this difference and discuss the results according to current models of human aging.

Chromatic spatial contrast sensitivity estimated by visual evoked cortical potential and psychophysics

The purpose of the present study was to measure contrast sensitivity to equiluminant gratings using steady-state visual evoked cortical potential (ssVECP) and psychophysics. Six healthy volunteers were evaluated with ssVECPs and psychophysics. The visual stimuli were red-green or blue-yellow horizontal sinusoidal gratings, 5° × 5°, 34.3 cd/m2 mean luminance, presented at 6 Hz. Eight spatial frequencies from 0.2 to 8 cpd were used, each presented at 8 contrast levels. Contrast threshold was obtained by extrapolating second harmonic amplitude values to zero. Psychophysical contrast thresholds were measured using stimuli at 6 Hz and static presentation. Contrast sensitivity was calculated as the inverse function of the pooled cone contrast threshold. ssVECP and both psychophysical contrast sensitivity functions (CSFs) were low-pass functions for red-green gratings. For electrophysiology, the highest contrast sensitivity values were found at 0.4 cpd (1.95 ± 0.15). ssVECP CSF was similar to dynamic psychophysical CSF, while static CSF had higher values ranging from 0.4 to 6 cpd (P < 0.05, ANOVA). Blue-yellow chromatic functions showed no specific tuning shape; however, at high spatial frequencies the evoked potentials showed higher contrast sensitivity than the psychophysical methods (P < 0.05, ANOVA). Evoked potentials can be used reliably to evaluate chromatic red-green CSFs in agreement with psychophysical thresholds, mainly if the same temporal properties are applied to the stimulus. For blue-yellow CSF, correlation between electrophysiology and psychophysics was poor at high spatial frequency, possibly due to a greater effect of chromatic aberration on this kind of stimulus.

Consciência fonológica e a memória de trabalho de crianças com e sem dificuldades na alfabetização / Phonological awareness and the working memory of children with and without literacy difficulties

OBJETIVO: Investigar as habilidades de consciência fonológica e memória de trabalho, bem como a sua influência no processo de alfabetização em um grupo de crianças intelectualmente normais. MÉTODOS: Participaram desta pesquisa 40 crianças de 7 anos e 6 meses a 8 anos, intelectualmente normais, dos segundo e terceiro anos do ensino fundamental. Estas foram organizadas em dois grupos com 20 cada, sendo um com dificuldade na alfabetização, e outro sem alterações nesse processo. Esses participantes foram submetidos ao teste RAVEN do quociente de inteligência, à avaliação audiométrica, ao teste de Consciência Fonológica - Instrumento de Avaliação Sequencial, à prova escrita de ditado e ao teste de memória de trabalho. RESULTADOS: Os indivíduos que se encontram na fase alfabética apresentaram bom desenvolvimento da consciência fonológica e 85% deles, elevado desempenho da memória de trabalho. As crianças na fase silábico-alfabética apresentaram alterações na consciência fonológica e 91,6% delas mostraram um mediano desempenho da memória de trabalho. Os sujeitos que se encontram nas fases silábica e pré-silábica tiveram mais dificuldades na consciência fonológica do que aqueles na silábico-alfabética, e obtiveram um baixo desempenho da memória de trabalho. Houve diferença entre as médias dos grupos para os testes CONFIAS e memória de trabalho (p<0,0001). Houve uma correlação também significativa, r=0,78, com p=0,01, entre as habilidades de consciência fonológica e memória de trabalho para o total de sujeitos da amostra. CONCLUSÕES: Verificou-se que, na medida em que os níveis de consciência fonológica e memória de trabalho se elevam, a fase de alfabetização da criança também avança, sendo, portanto, medidas diretamente proporcionais.

PURPOSE: To investigate phonological awareness and working memory skills as well as their influence on the literacy process in a group of intellectually normal children. METHODS: Forty intellectually normal children (7.6-8.0 years) from the second and third grades of elementary school participated. Children were organized in two groups (20 children each): one with and another without literacy difficulties. These participants underwent RAVEN's intelligence quotient test, audiometric assessment, CONFIAS test of phonological awareness, written spelling task, and working memory test. RESULTS: Children in the alphabetic phase presented a good development of phonological awareness, and 85% of them showed a high-performance working memory. Children in the syllabic-alphabetic phase had changes in phonological awareness, and 91.6% of them showed an average working memory performance. The subjects at pre-syllabic and syllabic phases demonstrated more difficulties in phonological awareness than those at syllabic-alphabetic and had a poor working memory performance. Between-group differences were observed for CONFIAS and working memory tests (p<0.0001). There was also a significant correlation (r=0.78, p=0.01) between the skills of phonological awareness and working memory for the total sample of individuals. CONCLUSIONS: Based on these results, it was found that as phonological awareness and working memory levels increased, the literacy phase also advanced, therefore showing that these are directly proportional measures.

Análise do reconhecimento das figuras do Teste MT Beta-86 modificado para uma adaptação: descrição e discussão de aspectos metodológicos / Analysis of figure recognition on the modified MT Beta-86 Test for adaptation: description and discussion of methodological aspects

OBJETIVO: Analisar o reconhecimento das figuras do Teste MT Beta-86 modificado, descrever e discutir aspectos metodológicos da adaptação desse instrumento de avaliação da linguagem. MÉTODOS: O estudo foi dividido em duas partes. Na primeira, participaram 61 indivíduos com escolaridade superior a 9 anos. Solicitou-se nomeação de 266 estímulos visuais e verificou-se a concordância da nomeação das figuras entre os participantes. Para a concordância de respostas, utilizou-se o teste de Cochran, com nível de significância de 5%. Em seguida, alguns estímulos visuais foram redesenhados, e as imagens foram substituídas. As imagens passaram pela segunda parte do estudo, da qual participaram 110 indivíduos divididos em 4 faixas de escolaridade (A: 1 a 4 anos; B: 5 a 8 anos; C: 9 a 11 anos e D: acima de 12 anos), de ambos os sexos e idades entre 18 e 75 anos. Foram considerados adequados para serem utilizados na avaliação de linguagem os estímulos com índice de concordância de, no mínimo, 70%. RESULTADOS: Na parte A do estudo, a partir do índice de concordância de nomeação das figuras, foram escolhidas as consideradas apropriadas para fazer parte do teste em sua versão em adaptação. A segunda parte demonstrou que todas as figuras selecionadas apresentaram concordância de resposta acima de 70%. CONCLUSÃO: Identificaram-se quais figuras do Teste MT Beta-86 modificado poderão continuar presentes na próxima versão do instrumento e, por meio da análise do baixo reconhecimento populacional, verificaram-se quais pranchas deverão ser substituídas e quais poderão compor a nova versão do teste.

PURPOSE: The purpose of this study was to analyze the recognition of figures from the modified MT Beta-86 test for subsequent refinement and adaptation of this language assessment instrument. METHODS: This study was organized into two parts. The first part of the study involved 61 subjects with educational level higher than nine years. Naming of 266 visual stimuli was elicited and concordance among participants on figure naming was also determined. Concordance of responses was assessed using Cochrane's test at a 5% level of significance. Some visual stimuli were subsequently re-designed and images were replaced. The second part of this study involved the re-testing of the new images among 110 individuals ranging in age from 18 to 75 years of both genders, stratified into four educational bands (A: 1 - 4 years; B: 5 - 8 years; C: 9 - 11 years; and D: more than 12 years). Stimuli with concordance level of 70% or higher were considered adequate. RESULTS: In part A of the study, from the index of agreement of naming, the figures considered suitable for inclusion in the adapted version were selected. In part B, all the figures had a response concordance level over 70%. CONCLUSION: Figures in the Modified MT Beta-86 test suitable for retention in the new version of the instrument were identified. Analysis of low sample recognition was used to identify boards for replacement, and those for retention, in the new version of the test.

Studies of visual mismatch negativity elicited by cartoon facial expressions / 生物医学工程学杂志

A modified "cross-modal delayed response" paradigm was used to investigate whether the visual mismatch negativity can be elicited by cartoon facial expressions, and to define the mechanism underlying automatic processing of facial expressions. Subjects taking part in the tests were instructed to discriminate the type of the tones they heard as quickly and accurately as possible, and to act merely when they heard the response imperative signal. Neutral, happy and angry faces were presented during intervals between a tone and a response imperative signal. Visual mismatch negativity (VMMN) was obtained by subtracting the event - related potential (ERP) elicited by neutral faces from that elicited by happy faces or angry faces. The angry-related VMMN was more negative than happy-related VMMN, and both were more negative in the left than in the right cerebral hemisphere. The results indicated that VMMN can be elicited by the cartoon facial expressions, and the facial expressions can be processed automatically.