Desempenho de escolares com dislexia e transtorno do déficit de atenção e hiperatividade nos processos de leitura

This study aimed to characterize and to compare the performance of students with an interdisciplinary diagnosis of dyslexia and attention deficit hyperactivity disorder (ADHD) in students with good academic performance on the reading processes. Sixty students from both genders, from 2nd to 4th grades of municipal public schools in Marília - SP participated in this study, they were distributed as follows: GI, 20 students with interdisciplinary diagnosis of dyslexia; GII, 20 students with ADHD and GIII, 20 students with good academic performance, paired according to gender, age and grade level with GI and GII. The students were submitted to the application of the assessment of reading processes (PROLEC) composed by four processes: letters identification, lexical, syntactical and semantic. The results highlighted that the students of GIII showed superior performance comparing with GI and GII. There was difference between GI and GII only in low frequency word reading and non words reading of the lexical process. The inferior performance from GI and GII in the PROLEC tests can be justified by the difficulty on the coding and decoding abilities. In ADHD students this difficulty was due to impaired interaction between the visual, linguistic, attention and auditory processing and in the dyslexic students was due to failure at the phonological mediation process, which depends on the knowledge of rules of grapheme - phoneme conversion to the acquisition of word reading. These changes affect the reading achievement and the comprehension of the read text.

O papel do intérprete de libras no ensino fundamental

The Brazilian sign language is a visual-spatial language, manifested through the hands, facial expressions and body, being considered a natural language used by the deaf community in Brazil. Thus, in a school context the knowledge of LIBRAS is fundamental to the interpreter and the deaf student, so, the role of the interpreter in the classroom is to mediate the relationship between teachers and students. The objective of this study is to investigate the importance of the interpreter in the educational process of the deaf child and try to map the possible difficulties found by him in his workspace, under his perspective in the classroom. This is a qualitative study, which had the data collection instrument as an open interview with questionnaire, dealing on issues concerning to the role and practice of the interpreter of Libras in the classroom to support the deaf student in school age. Therefore, participated in the study two interpreters of Libras who works in elementary school classrooms in the city of Jaú. The results shown that the interpreter's role is extremely important for the education of children with hearing impairment, but it's not recognized and many times not accepted by teachers and educational institutions, when its real function is respected

Premotor and occipital theta asymmetries as discriminators of memory- and stimulus-guided tasks

The saccadic paradigm has been used to investigate specific cortical networks involving visuospatial attention. We examined whether asymmetry in theta and beta band differentiates the role of the hemispheres during the execution of two different prosacadic conditions: a fixed condition, where the stimulus was presented at the same location; and a random condition, where the stimulus was unpredictable. Twelve healthy volunteers (3 male; mean age: 26.25) performed the task while their brain activity pattern was recorded using quantitative electroencephalography. We did not find any significant difference for beta, slow- and fast-alpha frequencies for the pairs of electrodes analyzed. The results for theta band showed a superiority of the left hemisphere in the frontal region when responding to the random condition on the right, which is related to the planning and selection of responses, and also a greater activation of the right hemisphere during the random condition, in the occipital region, related to the identification and recognition of patterns. These results indicate that asymmetries in the premotor area and the occipital cortex differentiate memory- and stimulus-driven tasks. (C) 2011 Elsevier Inc. All rights reserved.

Moving along the mental number line: Interactions between whole-body motion and numerical cognition

Active head turns to the left and right have recently been shown to influence numerical cognition by shifting attention along the mental number line. In the present study, we found that passive whole-body motion influences numerical cognition. In a random-number generation task (Experiment 1), leftward and downward displacement of participants facilitated small number generation, whereas rightward and upward displacement facilitated the generation of large numbers. Influences of leftward and rightward motion were also found for the processing of auditorily presented numbers in a magnitude-judgment task (Experiment 2). Additionally, we investigated the reverse effect of the number-space association (Experiment 3). Participants were displaced leftward or rightward and asked to detect motion direction as fast as possible while small or large numbers were auditorily presented. When motion detection was difficult, leftward motion was detected faster when hearing small number and rightward motion when hearing large number. We provide new evidence that bottom-up vestibular activation is sufficient to interact with the higher-order spatial representation underlying numerical cognition. The results show that action planning or motor activity is not necessary to influence spatial attention. Moreover, our results suggest that self-motion perception and numerical cognition can mutually influence each other.

Self-motion perception influences number processing: evidence from a parity task

We investigated the role of horizontal body motion on the processing of numbers. We hypothesized that leftward self-motion leads to shifts in spatial attention and therefore facilitates the processing of small numbers, and vice versa, we expected that rightward self-motion facilitates the processing of large numbers. Participants were displaced by means of a motion platform during a parity judgment task. We found a systematic influence of self-motion direction on number processing, suggesting that the processing of numbers is intertwined with the processing of self-motion perception. The results differed from known spatial numerical compatibility effects in that self-motion exerted a differential influence on inner and outer numbers of the given interval. The results highlight the involvement of sensory body motion information in higher-order spatial cognition.

Grapheme-color synaesthesia is associated with a distinct cognitive style

In this study we investigated whether synaesthesia is associated with a particular cognitive style. Cognitive style refers to preferred modes of information processing, such as a verbal style or a visual style. We reasoned that related to the enriched world of experiences created by synaesthesia, its association with enhanced verbal and visual memory, higher imagery and creativity, synaesthetes might show enhanced preference for a verbal as well as for a visual cognitive style compared to non-synaesthetes. In Study 1 we tested a large convenience sample of 1046 participants, who classified themselves as grapheme-color, sound-color, lexical-gustatory, sequence-space, or as non-synaesthetes. To assess cognitive style, we used the revised verbalizer-visualizer questionnaire (VVQ), which involves three independent cognitive style dimensions (verbal style, visual-spatial style, and vivid imagery style). The most important result was that those who reported grapheme-color synaesthesia showed higher ratings on the verbal and vivid imagery style dimensions, but not on the visual-spatial style dimension. In Study 2 we replicated this finding in a laboratory study involving 24 grapheme-color synaesthetes with objectively confirmed synaesthesia and a closely matched control group. Our results indicate that grapheme-color synaesthetes prefer both a verbal and a specific visual cognitive style. We suggest that this enhanced preference, probably together with the greater ease to switch between a verbal and a vivid visual imagery style, may be related to cognitive advantages associated with grapheme color synaesthesia such as enhanced memory performance and creativity.

A novel computer test to assess driving-relevant cognitive functions - a pilot study

BACKGROUND: The assessment of driving-relevant cognitive functions in older drivers is a difficult challenge as there is no clear-cut dividing line between normal cognition and impaired cognition and not all cognitive functions are equally important for driving. METHODS: To support decision makers, the Bern Cognitive Screening Test (BCST) for older drivers was designed. It is a computer-assisted test battery assessing visuo-spatial attention, executive functions, eye-hand coordination, distance judgment, and speed regulation. Here we compare the performance in BCST with the performance in paper and pencil cognitive screening tests and the performance in the driving simulator testing of 41 safe drivers (without crash history) and 14 unsafe drivers (with crash history). RESULTS: Safe drivers performed better than unsafe drivers in BCST (Mann-Whitney U test: U = 125.5; p = 0.001) and in the driving simulator (Student's t-test: t(44) = -2.64, p = 0.006). No clear group differences were found in paper and pencil screening tests (p > 0.05; ns). BCST was best at identifying older unsafe drivers (sensitivity 86%; specificity 61%) and was also better tolerated than the driving simulator test with fewer dropouts. CONCLUSIONS: BCST is more accurate than paper and pencil screening tests, and better tolerated than driving simulator testing when assessing driving-relevant cognition in older drivers.

When looking back to nothing goes back to nothing

Previous research showed that the eyes revisit the location in which the stimulus has been encoded when visual or verbal information is retrieved from memory. A recent study showed that this behavior still occurs 1 week after encoding, suggesting that visual, spatial and linguistic information is tightly associated with the oculomotor trace and stored as an integrated memory representation. However, it is yet unclear whether looking behavior simply remains stable between encoding and recall or whether it changes over time in a more fine-tuned manner. Here, we investigate the time course of looking behavior during recall in multiple sessions across 1 week. Participants encoded visual objects presented in one of the four locations on the computer screen. In five sessions during the week after encoding, they performed on a visual memory recall task. During retrieval, participants looked back to the encoding location, but only in the recall sessions within 1 day of encoding. We discuss different explanations for the temporal dynamics of looking behavior during recall, searching for the role of eye movements in memory.

Ecfrasis: Escritura y pintura en el costumbrismo argentino

This dissertation examines the discursive practice of Argentine costumbrista texts from a novel perspective. In (re)reading the works of selected prominent writers from the late colonial period to the end of the Nineteenth Century, including those of Alonso Carrió de la Vandera, Emeric Essex Vidal, León Pallière, Lucio Vicente López, Lucio V. Mansilla, and Pastor Obligado we focus on the presence of ekphrastic enunciations with a view toward linking the plastic, painterly dimensions of the prose to parallel representations by artists of the same period. Thus the costumbristas are studied in tandem with the watercolors, oil paintings and lithographic compositions of artists such as Carlos Enrique Pellegrim, César Hipólito Bacle, Raymond Monvoisin and Hipólito Moulin. The resulting comparative study of the two arts---the verbal and the pictorial---illustrates the notion described by W. J. T. Mitchell that a literary text may well "represent a work of visual or graphic art." And thus, it provides us with visual, spatial motifs that enhance its powers of representation. ^ In developing our focus on ekphrastic representations we have followed the theoretic studies of Murray Krieger, Jean H. Hagstrum, James Hefferman, John Hollander, W. J. T. Mitchell, Johann Gottfried Herder, and Wendy Steiner among others, all of whom in various ways take their cue from Horace's Ut pictura poesis and the notion that poetry, that is literary discourse, can be likened to a panting and that in both arts there is a refractive quality that makes literature a spoken vehicle of expression and painting a silent, complementary voice. ^ In studying the literary and plastic discourses comparatively what becomes evident is that they share cultural and ideological concerns that center around the notion of self-definition, national identity, and the relation of the individual to the incipient national community (Benedict Anderson). These concerns are highlighted via the depiction of customs, mores, dress, work habits, professions, and social classes. In late colonial literature and painting and especially in the Nineteenth Century, which constitutes the defining period of Argentine political independence, the confluence of the two disciplinary discourses addresses, and underscores the issues of socio-political empowerment in the new Argentine nation. ^

Propriedades Psicométricas da Figura Complexa de Rey numa Amostra de Adultos da População Portuguesa

A Figura Complexa de Rey-Osterrieth (FCR-O) é um teste de avaliação neuropsicológica realizado em três momentos, que avalia a habilidade visuoespacial, organização percetiva, aptidão visuoespacial construtiva, memória visual, atenção, planificação e função motora. Esta investigação tem como objetivo avaliar as propriedades psicométricas da FCR-O, numa amostra de adultos da população portuguesa. O protocolo de investigação incluiu uma bateria de testes neuropsicológicos: Figura Complexa de Rey (FCR-O), Teste do Desenho do Relógio (TDR), Bateria de Avaliação Frontal (FAB), Rey 15 Item, Matrizes Progressivas de Raven (MPR) e a Escala de Auto-Avaliação da Ansiedade de Zung. A amostra deste estudo abrangeu 453 sujeitos, 192 homens e 261 mulheres, com idades compreendidas entre os 18 e os 90 anos (M = 40,44; DP = 19,78). Os resultados principais deste estudo indicam que a FCR-O é influenciada por diversas variáveis, tais como a idade, sexo, escolaridade, profissão, residência e regiões, apresentando uma validade convergente adequada, com correlações positivas com o TDR, FAB e MPR. A título conclusivo, verificámos que a FCR-O tem caraterísticas psicométricas satisfatórias, especificamente da consistência interna, concordância entre juízes e estabilidade temporal, sugerindo a sua utilização em populações não clínicas. / The Rey–Osterrieth complex figure (ROCF) is a neuropsychological test which was conducted in three phases to assess visuospatial ability, perceptive organization, constructive visuospatial ability, visual memory, attention, planning and motor function. This investigations aims to evaluate the psychometric properties of ROCF, in an adult sample of the Portuguese population. The investigation protocol includes a battery of neuropsychological tests: Complex Figure of Rey, Clock Drawing Test, Frontal Assessment Battery, Rey Item 15, Raven Progressive Matrices and the Zung Self-Rating Anxiety Scale. The sample of this study consisted of 453 subjects, 192 men and 261 women, aged between 18 and 90 years old (M = 40.44, SD = 19.78). The result of this study indicate that the ROCF is influenced by several variables, such as age, sex, education, profession, residence and regions. It also has adequate convergent validity, with positive correlations with TDR, FAB and MPR. In conclusion, we verified that the ROCF is a useful instrument to early detect some neuropsychological deficits. It revealed satisfactory psychometric characteristics, specifically in internal consistency, agreement between judges and temporal stability, suggesting its usage in no clinical populations.

Ansiedade pós acidente vascular cerebral

Se entendemos o Acidente vascular cerebral como um acontecimento incapacitante da vida dos pacientes, poderemos compreender as alterações comportamentais e emocionas que este provoca. No entanto, poucos estudos têm sido realizados acerca desta temática, tendo assim este estudo como objetivo verificar se existe uma associação clara entre a ansiedade e um determinado tipo de AVC. Aplicou-se a escala de Montereal, o State-Trait Anxiety lnventory e o Inventario Neuropsiquiátrico numa amostra constituída por pacientes que tenham sofrido AVC no período de três meses a um ano, e num grupo controlo. Os resultados mostram que não existem diferenças significativas no que respeita à ansiedade nos pacientes com AVC anterior. Conclui-se que não existe um aumento de ansiedade, mas que os défices visuo-espaciais e atencionais são mais significativos no AVC anterior. / ABSTRACT: lf we recognize Stroke as an event that can incapacitate the patients' life, we can comprehend the behaviour and emotional changes that this provokes. One of the psychiatric symptoms usually associated to Stroke is anxiety. However, few studies have been made concerning this matter, being the purpose of this study to verify if a clear association exists between anxiety and a certain type of Stroke. The Montereal Cognitiva Assessment, State-Trait Anxiety lnventory, and Neuropsychiatric lnventory were applied in a sample consisting of patients that have suffered Stroke in the period of three months to one year, and in a control group. The results show no significant differences in what regards to anxiety in patients with previous Stroke. We conclude that there is no increase in anxiety after stroke, but cognitive deficits in visual-spatial and attentional are most significant in subjects with previous stroke.

The influence of naturalistic, directionally non-specific motion on the spatial deployment of visual attention in right-hemispheric stroke

An impairment of the spatial deployment of visual attention during exploration of static (i.e., motionless) stimuli is a common finding after an acute, right-hemispheric stroke. However, less is known about how these deficits: a) are modulated through naturalistic motion (i.e., without directional, specific spatial features); and, b) evolve in the subacute/chronic post-stroke phase. In the present study, we investigated free visual exploration in three patient groups with subacute/chronic right-hemispheric stroke and in healthy subjects. The first group included patients with left visual neglect and a left visual field defect (VFD), the second patients with a left VFD but no neglect, and the third patients without neglect or VFD. Eye movements were measured in all participants while they freely explored a traffic scene without (static condition) and with (dynamic condition) naturalistic motion, i.e., cars moving from the right or left. In the static condition, all patient groups showed similar deployment of visual exploration (i.e., as measured by the cumulative fixation duration) as compared to healthy subjects, suggesting that recovery processes took place, with normal spatial allocation of attention. However, the more demanding dynamic condition with moving cars elicited different re-distribution patterns of visual attention, quite similar to those typically observed in acute stroke. Neglect patients with VFD showed a significant decrease of visual exploration in the contralesional space, whereas patients with VFD but no neglect showed a significant increase of visual exploration in the contralesional space. No differences, as compared to healthy subjects, were found in patients without neglect or VFD. These results suggest that naturalistic motion, without directional, specific spatial features, may critically influence the spatial distribution of visual attention in subacute/chronic stroke patients.

The modulation of simple reaction time by the spatial probability of a visual stimulus

Simple reaction time (SRT) in response to visual stimuli can be influenced by many stimulus features. The speed and accuracy with which observers respond to a visual stimulus may be improved by prior knowledge about the stimulus location, which can be obtained by manipulating the spatial probability of the stimulus. However, when higher spatial probability is achieved by holding constant the stimulus location throughout successive trials, the resulting improvement in performance can also be due to local sensory facilitation caused by the recurrent spatial location of a visual target (position priming). The main objective of the present investigation was to quantitatively evaluate the modulation of SRT by the spatial probability structure of a visual stimulus. In two experiments the volunteers had to respond as quickly as possible to the visual target presented on a computer screen by pressing an optic key with the index finger of the dominant hand. Experiment 1 (N = 14) investigated how SRT changed as a function of both the different levels of spatial probability and the subject's explicit knowledge about the precise probability structure of visual stimulation. We found a gradual decrease in SRT with increasing spatial probability of a visual target regardless of the observer's previous knowledge concerning the spatial probability of the stimulus. Error rates, below 2%, were independent of the spatial probability structure of the visual stimulus, suggesting the absence of a speed-accuracy trade-off. Experiment 2 (N = 12) examined whether changes in SRT in response to a spatially recurrent visual target might be accounted for simply by sensory and temporally local facilitation. The findings indicated that the decrease in SRT brought about by a spatially recurrent target was associated with its spatial predictability, and could not be accounted for solely in terms of sensory priming.

Spatial representation and attention in toddlers with Williams syndrome and Down syndrome

The nature of the spatial representations that underlie simple visually guided actions early in life was investigated in toddlers with Williams syndrome (WS), Down syndrome (DS), and healthy chronological age- and mental age-matched controls, through the use of a "double-step" saccade paradigm. The experiment tested the hypothesis that, compared to typically developing infants and toddlers, and toddlers with DS, those with WS display a deficit in using spatial representations to guide actions. Levels of sustained attention were also measured within these groups, to establish whether differences in levels of engagement influenced performance on the double-step saccade task. The results showed that toddlers with WS were unable to combine extra-retinal information with retinal information to the same extent as the other groups, and displayed evidence of other deficits in saccade planning, suggesting a greater reliance on sub-cortical mechanisms than the other populations. Results also indicated that their exploration of the visual environment is less developed. The sustained attention task revealed shorter and fewer periods of sustained attention in toddlers with DS, but not those with WS, suggesting that WS performance on the double-step saccade task is not explained by poorer engagement. The findings are also discussed in relation to a possible attention disengagement deficit in WS toddlers. Our study highlights the importance of studying genetic disorders early in development. (C) 2002 Elsevier Science Ltd. All rights reserved.

The role of the right frontal eye field in overt visual attention deployment as assessed by free visual exploration

The frontal eye field (FEF) is known to be involved in saccade generation and visual attention control. Studies applying covert attentional orienting paradigms have shown that the right FEF is involved in attentional shifts to both the left and the right hemifield. In the current study, we aimed at examining the effects of inhibitory continuous theta burst (cTBS) transcranial magnetic stimulation over the right FEF on overt attentional orienting, as measured by a free visual exploration paradigm. In forty-two healthy subjects, free visual exploration of naturalistic pictures was tested in three conditions: (1) after cTBS over the right FEF; (2) after cTBS over a control site (vertex); and, (3) without any stimulation. The results showed that cTBS over the right FEF-but not cTBS over the vertex-triggered significant changes in the spatial distribution of the cumulative fixation duration. Compared to the group without stimulation and the group with cTBS over the vertex, cTBS over the right FEF decreased cumulative fixation duration in the left and in the right peripheral regions, and increased cumulative fixation duration in the central region. The present study supports the view that the right FEF is involved in the bilateral control of not only covert, but also of overt, peripheral visual attention.