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Dual-task interference: Attentional and neurophysiological influences

HIRAGA, Cynthia Y.; GARRY, Michael I.; CARSON, Richard G.; SUMMERS, Jeffery J.
Fonte: ELSEVIER SCIENCE BV Publicador: ELSEVIER SCIENCE BV
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.46%
Performing two tasks simultaneously often degrades performance of one or both tasks. While this dual-task interference is classically interpreted in terms of shared attentional resources, where two motor tasks are performed simultaneously interactions within primary motor cortex (i.e., activity-dependent coupling) may also be a contributing factor. In the present study TMS (transcranial magnetic stimulation) was used to examine the contribution of activity-dependent coupling to dual-task interference during concurrent performance of a bimanual coordination task and a discrete probe reaction time (RT) task involving the foot. Experiments 1 and 2 revealed that activity-dependent coupling within the leg corticomotor pathway was greater during dual-task performance than single-task performance, and this was associated with interference on the probe RT task (i.e., increased RT). Experiment 3 revealed that dual-task interference occurred regardless of whether the dual-task involved two motor tasks or a motor and cognitive task, however activity-dependent coupling was present only when a dual motor task was performed. This suggests that activity-dependent coupling is less detrimental to performance than attentional processes operating upstream of the corticomotor system. Finally...

Comparação entre os efeitos do treino motor isolado e do treino motor em condição de tarefa dupla, sobre a marcha e a atenção, em idosos saudáveis e pacientes com doença de Parkinson; Comparison of the effects of single task and the dual-task condition motor training on the gait and on the attention in healthy elderly and Parkinsons disease patients.

Hattori, Erika Okamoto
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 13/06/2008 PT
Relevância na Pesquisa
46.45%
A doença de Parkinson (DP) idiopática é uma patologia neurodegenerativa progressiva, caracterizada por sintomas motores como bradicinesia, rigidez muscular, tremor de repouso e instabilidade postural e sintomas não motores como alterações atentivas que influenciam o gerenciamento entre tarefas simultâneas. Mesmo no processo de envelhecimento saudável, há um declínio atentivo. Somando-se a isso, os núcleos da base estão envolvidos com a automatização de movimentos assim, observa-se prejuízo na habilidade de controle dos movimentos automáticos em pacientes com DP com agravamento na execução de tarefas duplas, já que estes passam a despender mais recursos atentivos para tarefas motoras. A habilidade de andar é uma das mais prejudicadas com o surgimento da DP, um comprometimento funcional que interfere no gerenciamento/divisão de recursos atentivos entre outras tarefas que ocorram simultaneamente. Atualmente, o tratamento fisioterapêutico para pacientes com DP prioriza a execução de tarefas motoras isoladas, principalmente quando os pacientes se encontram em estágios moderados e avançados da doença. Este estudo teve por objetivo comparar a eficácia entre dois tipos de treinamento em pacientes com DP e idosos saudáveis. Os grupos foram divididos em dois subgrupos...

Aprendizagem em tarefas duais: variação de desempenho e demanda atencional; Dual task learning: variation of performance and attention demand.

Claudio, Ana Paula Kogake
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 31/10/2011 PT
Relevância na Pesquisa
66.47%
O presente estudo teve como objetivo avaliar a aprendizagem em uma tarefa dual em comparação à aprendizagem de tarefas singulares e a respectiva variação de demanda atencional em função da prática. Participaram do estudo 27 estudantes universitários destros, divididos em três grupos de acordo com a tarefa praticada: prática da tarefa singular de traçar uma estrela com a mão esquerda recebendo feedback invertido (EST), prática da tarefa singular de toques sequenciais dos dedos da mão direita (TOQ) e prática dual consistindo na prática simultânea das duas tarefas singulares (T+E). A demanda atencional foi mensurada por meio do tempo de reação probatório, com estímulo auditivo e resposta vocal. As tarefas foram praticadas em 200 tentativas, distribuídas em 4 sessões executadas em diferentes dias. O efeito de aprendizagem foi avaliado após um dia e após uma semana a última sessão de prática. Os resultados mostraram que a demanda atencional foi maior na tarefa dual em comparação com as tarefas singulares e houve diminuição persistente da demanda atencional após o período de prática somente para a tarefa dual. A análise da fase de aquisição mostrou que o ganho proporcional de desempenho do grupo T+E foi equivalente ao encontrado para os grupos singulares...

Age and education influence the performance of elderly women on the dual-task Timed Up and Go test

Gomes,Gisele de Cássia; Teixeira-Salmela,Luci Fuscaldi; Fonseca,Bruna Espeschit; Freitas,Flávia Alexandra Silveira de; Fonseca,Maria Luísa Morais; Pacheco,Bruna Débora; Gonçalves,Marisa Rocha; Caramelli,Paulo
Fonte: Academia Brasileira de Neurologia - ABNEURO Publicador: Academia Brasileira de Neurologia - ABNEURO
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2015 EN
Relevância na Pesquisa
66.13%
Gait variability is related to functional decline in the elderly. The dual-task Timed Up and Go Test (TUG-DT) reflects the performance in daily activities. Objective To evaluate the differences in time to perform the TUG with and without DT in elderly women with different ages and levels of education and physical activity. Method Ninety-two elderly women perfomed the TUG at usual and fast speeds, with and without motor and cognitive DT. Results Increases in the time to perform the TUG-DT were observed at older ages and lower educational levels, but not at different levels of physical activity. More educated women performed the test faster with and without DT at both speeds. When age was considered, significant differences were found only for the TUG-DT at both speeds. Conclusion Younger women with higher education levels demonstrated better performances on the TUG-DT.

Effect of training on the ability of dual-task coordination

Rosin,F.M.; Sylwan,R.P.; Galera,C.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/1999 EN
Relevância na Pesquisa
66.37%
Within the framework of the working memory model proposed by A. Baddeley and G. Hitch, a dual-task paradigm has been suggested to evaluate the capacity to perform simultaneously two concurrent tasks. This capacity is assumed to reflect the functioning of the central executive component, which appears to be impaired in patients with dysexecutive syndrome. The present study extends the investigation of an index ("mu"), which is supposed to indicate the capacity of coordination of concurrent auditory digit span and tracking tasks, by testing the influence of training on the performance in the dual task. The presentation of the same digit sequence lists or always-different lists did not differently affect the performance. The span length affected the mu values. The improved performance in the tasks under the dual condition closely resembled the improvement in the single-task performance. So, although training improved performance in the single and dual conditions, especially for the tracking component, the mu values remained stable throughout the sessions when the single tasks were performed first. Conversely, training improved the capacity of dual-task coordination throughout the sessions when dual task was performed first, addressing the issue of the contribution of the within-session practice to the mu index.

Effect of practice and span length on the dual-task coordination executive test

Sylwan,R.P.; Rosin,F.M.; Galera,C.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/1999 EN
Relevância na Pesquisa
66.32%
The measure "mu", proposed as an index of the ability to coordinate concurrent box-crossing (BC) and digit-span (DS) tasks in the dual task (DT), should reflect the capacity of the executive component of the working memory system. We investigated the effect of practice in BC and of a change in the digit span on mu by adding previous practice trials in BC and diminishing, maintaining or increasing the digit sequence length. The mu behavior was evaluated throughout three trials of the test. Reported strategies in digit tasks were also analyzed. Subjects with diminished span showed the best performance in DT due to a stable performance in DS and BC in the single- and dual-task conditions. These subjects also showed a more stable performance throughout trials. Subjects with diminished span tended to employ effortless strategies, whereas subjects with increased span employed effort-requiring strategies and showed the lowest means of mu. Subjects with initial practice trials showed the best performance in BC and the most differentiated performance between the single- and dual-task conditions in BC. The correlation coefficient between the mu values obtained in the first and second trials was 0.814 for subjects with diminished span and practice trials in BC. It seems that the within-session practice in BC and the performance variability in DS affect the reliability of the index mu. To control these factors we propose the introduction of previous practice trials in BC and a modification of the current method to determine the digit sequence length. This proposal should contribute to the development of a more reliable method to evaluate the executive capacity of coordination in the dual-task paradigm.

The relationship between dual-task and cognitive performance among elderly participants who exercise regularly

Lima,Luciana C. A.; Ansai,Juliana H.; Andrade,Larissa P.; Takahashi,Anielle C. M.
Fonte: Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia Publicador: Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2015 EN
Relevância na Pesquisa
66.22%
BACKGROUND: The dual-task performance is associated with the functionality of the elderly and it becomes more complex with age. OBJECTIVE: To investigate the relationship between the Timed Up and Go dual task (TUG-DT) and cognitive tests among elderly participants who exercise regularly. METHOD: This study examined 98 non-institutionalized people over 60 years old who exercised regularly. Participants were assessed using the TUG-DT (i.e. doing the TUG while listing the days of the week in reverse order), the Montreal Cognitive Assessment (MoCA), the Clock Drawing Test (CDT), and the Mini Mental State Examination (MMSE). The motor (i.e. time and number of steps) and cognitive (i.e. number of correct words) data were collected from TUG-DT . We used a significance level of α=0.05 and SPSS 17.0 for all data analyses. RESULTS: This current elderly sample featured a predominance of women (69.4%) who were highly educated (median=10 years of education) compared to Brazilian population and mostly non-fallers (86.7%). The volunteers showed a good performance on the TUG-DT and the other cognitive tests, except the MoCA, with scores below the cutoff of 26 points. Significant and weak correlations were observed between the TUG-DT (time) and the visuo-spatial/executive domain of the MoCA and the MMSE. The cognitive component of the TUG-DT showed strong correlations between the total MoCA performance score and its visuo-spatial/executive domain. CONCLUSIONS: The use of the TUG-DT to assess cognition is promising; however...

Training dual-task walking in community-dwelling adults within 1 year of stroke: A protocol for a single-blind randomized controlled trial

Plummer-D’Amato, Prudence; Kyvelidou, Anastasia; Sternad, Dagmar; Najafi, Bijan; Villalobos, Raymond M; Zurakowski, David
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
EN_US
Relevância na Pesquisa
66.45%
Background: Community ambulation is a highly complex skill requiring the ability to adapt to increased environmental complexity and perform multiple tasks simultaneously. After stroke, individuals demonstrate a diminished ability to perform dual-tasks. Current evidence suggests that conventional rehabilitation does not adequately address gait-related dual-task impairments after stroke, which may be contributing to low levels of participation and physical inactivity in community-dwelling stroke survivors. The objective of this study is to investigate the efficacy of dual-task gait training in community-dwelling adults within 1 year of stroke. Specifically, we will compare the effects of dual-task gait training and single-task gait training on cognitive-motor interference during walking at preferred speed and at fastest comfortable speed (Aim 1), locomotor control during obstacle negotiation (Aim 2), and spontaneous physical activity (Aim 3). Methods/design: This single-blind randomized controlled trial will involve 44 individuals within 12 months of stroke. Following baseline evaluation, participants will be randomly allocated to single- or dual-task gait training. Both groups will receive 12, 30-minute sessions provided one-on-one over 4–6 weeks in an outpatient therapy setting. Single-task gait training involves practice of gait activities incorporating motor relearning principles. Dual-task gait training involves an identical gait training protocol; the critical difference being that the dual-task gait training group will practice the gait activities while simultaneously performing a cognitive task for 75% of the repetitions. Blinded assessors will measure outcomes at baseline...

Impact of sub-thalamic nucleus deep brain stimulation on dual tasking gait in Parkinson’s disease

Seri-Fainshtat, Eliraz; Israel, Zvi; Weiss, Aner; Hausdorff, Jeffrey M.
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
EN_US
Relevância na Pesquisa
56.39%
Background: The beneficial effects of bilateral sub-thalamic nucleus deep brain stimulation on motor function and gait in advanced Parkinson’s disease are established. Less is known about the effect of stimulation on cognitive function and the capacity to walk while dual tasking, an ability that has been related to fall risk. Everyday walking takes place in complex environments that often require multi-tasking. Hence, dual tasking gait performance reflects everyday ambulation as well as gait automaticity. The purpose of this study was to examine the impact of sub-thalamic nucleus deep brain stimulation on dual task walking in patients with advanced Parkinson’s disease. Methods: Gait was assessed using a performance-based test and by quantifying single-task and dual task walking conditions in 28 patients with advanced Parkinson’s disease. These tests were conducted in 4 conditions: “OFF” medication, with the stimulator turned on and off, and “ON” medication, with the stimulator turned on and off. A previously validated, computerized neuro-psychological battery assessed executive function, attention and memory “OFF” and “ON” deep brain stimulation, after subjects took their anti-Parkinsonian medications. Results: Stimulation improved motor function and the spatiotemporal parameters of gait (e.g....

Tai Chi Training may Reduce Dual Task Gait Variability, a Potential Mediator of Fall Risk, in Healthy Older Adults: Cross-Sectional and Randomized Trial Studies

Wayne, Peter M.; Hausdorff, Jeffrey M.; Lough, Matthew; Gow, Brian J.; Lipsitz, Lewis; Novak, Vera; Macklin, Eric A.; Peng, Chung-Kang; Manor, Brad
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
EN_US
Relevância na Pesquisa
66.13%
Background: Tai Chi (TC) exercise improves balance and reduces falls in older, health-impaired adults. TC’s impact on dual task (DT) gait parameters predictive of falls, especially in healthy active older adults, however, is unknown. Purpose To compare differences in usual and DT gait between long-term TC-expert practitioners and age-/gender-matched TC-naïve adults, and to determine the effects of short-term TC training on gait in healthy, non-sedentary older adults. Methods: A cross-sectional study compared gait in healthy TC-naïve and TC-expert (24.5 ± 12 years experience) older adults. TC-naïve adults then completed a 6-month, two-arm, wait-list randomized clinical trial of TC training. Gait speed and stride time variability (Coefficient of Variation %) were assessed during 90 s trials of undisturbed and cognitive DT (serial subtractions) conditions. Results: During DT, gait speed decreased (p < 0.003) and stride time variability increased (p < 0.004) in all groups. Cross-sectional comparisons indicated that stride time variability was lower in the TC-expert vs. TC-naïve group, significantly so during DT (2.11 vs. 2.55%; p = 0.027); by contrast, gait speed during both undisturbed and DT conditions did not differ between groups. Longitudinal analyses of TC-naïve adults randomized to 6 months of TC training or usual care identified improvement in DT gait speed in both groups. A small improvement in DT stride time variability (effect size = 0.2) was estimated with TC training...

The distribution of spatial attention changes with task demands during goal-directed reaching

Long, H.; Ma-Wyatt, A.
Fonte: Springer Berlin Heidelberg Publicador: Springer Berlin Heidelberg
Tipo: Artigo de Revista Científica
Publicado em //2014 EN
Relevância na Pesquisa
56.23%
Goal-directed movements are commonly used to allow humans to interact with their environment. When making a goal-directed movement in a natural environment, there are many competing stimuli. It is therefore important to understand how making a goal-directed movement could be impacted by the need to divide attention between the movement and competing stimuli. We used a dual-task paradigm to investigate the sharing of attentional resources between a search task in central vision and a peripheral pointing task completed concurrently. Results suggest some degree of shared attentional resources between these two tasks with performance on both central and peripheral tasks degraded under dual-task conditions. Movement latency, but not movement time, was also affected by dualtask conditions. Altogether, the results suggest that there is a cost to reach performance if attention is engaged away from the movement goal. Interestingly, this cost is associated with movement planning rather than execution.; Heidi Long, Anna Ma‑Wyatt

Desempenho motor em tarefas de atenção dividida em pacientes com comprometimento cognitivo leve e doença de Alzheimer; Motor performance in a dividided attention task in patients with mild cognitive impairment and Alzheimer\'s disease

Borges, Sheila de Melo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 04/04/2013 PT
Relevância na Pesquisa
56.2%
Desordens motoras são descritas no estágio final da doença de Alzheimer (DA), porém pesquisas recentes têm demonstrado que idosos com comprometimento cognitivo leve (CCL) e em fase inicial da DA apresentam alterações na marcha, especialmente em condições de atenção dividida (tarefa dupla). Esta pesquisa teve como objetivo avaliar o desempenho motor com e sem tarefa de atenção dividida em idosos com CCL e DA; e verificar se esta medida pode ser utilizada para diferenciar idosos cognitivamente saudáveis, com CCL e com DA. Foram avaliados 104 idosos (26 com DA leve, 42 com CCL e 36 cognitivamente saudáveis - controles) por meio do Timed Up and Go teste (TUG), em quatro condições experimentais: (1) tarefa simples (apenas o TUG), (2) TUG com tarefa cognitiva, (3) TUG com tarefa manual, e (4) tarefa tripla (com tarefa cognitiva e manual). Diferenças significativas foram observadas em todas as condições experimentais do TUG entre grupos diagnósticos, especialmente em relação ao tempo (em segundos) e número de passos (TUG 1-4) e paradas (TUG 2-4). Em relação à área sob a curva (AUC), as quatro formas do TUG apresentaram alto grau de discriminação entre os grupos diagnósticos em relação: 1) ao tempo (em segundos): AUC > 0...

Impact of Dual Task on Parkinson's Disease, Stroke and Ataxia Patients' Gait: A Comparative Analysis

Maciel,Michelly Arjona; Silva,Ana Carolina Souza Moura; Cyrillo,Fabio Navarro; Santos,Suely; Torriani-Pasin,Camila
Fonte: Curso de Pós-Graduação em Psicologia da Universidade Federal do Rio Grande do Sul Publicador: Curso de Pós-Graduação em Psicologia da Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2014 EN
Relevância na Pesquisa
66.28%
Introduction: Performing dual task for neurological patients is complex and it can be influenced by the localization of the neurological lesion. Objective: Comparing the impact of dual task on gait in patients with Parkinson's disease, stroke and ataxia. Method: Subjects with Parkinson's disease (PD) in initial phase, stroke and ataxia, with independent gait, were evaluated while doing simple gait, with cognitive, motor and cognitive-motor gait demand, assessing average speed and number of steps. Results: Ataxia and stroke patients, compared with PD, showed an increase in the number of steps and decrease the average speed on the march with cognitive demand. Subjects with PD performed better on tasks when compared to others. Conclusion: In this study the impact of dual task was lower in Parkinson's disease patients.

Dual task and postural control in Alzheimer's and Parkinson's disease

Andrade,Larissa Pires de; Rinaldi,Natália Madalena; Coelho,Flávia Gomes de Melo; Tanaka,Kátia; Stella,Florindo; Gobbi,Lilian Teresa Bucken
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2014 EN
Relevância na Pesquisa
66.31%
Patients with neurodegenerative diseases are required to use cognitive resources while maintaining postural control. The aim of this study was to investigate the effects of a frontal cognitive task on postural control in patients with Alzheimer, Parkinson and controls. Thirty-eight participants were instructed to stand upright on a force platform in two experimental conditions: single and dual task. Participants with Parkinson's disease presented an increase in the coefficient of variation greater than 100% in the dual task as compared to the single task for center of pressure (COP) area and COP path. In addition, patients with Parkinson's and Alzheimer's disease had a higher number of errors during the execution of the cognitive task when compared to the group of elderly without neurodegenerative diseases. The motor cortex, which is engaged in postural control, does not seem to compete with frontal brain regions in the performance of the cognitive task. However, patients with Parkinson's and Alzheimer's disease presented worsened performance in cognitive task.

Influence of dual task and frailty on gait parameters of older community-dwelling individuals

Guedes,Rita C.; Dias,Rosângela C.; Pereira,Leani S. M.; Silva,Sílvia L. A.; Lustosa,Lygia P.; Dias,João M. D.
Fonte: Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia Publicador: Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2014 EN
Relevância na Pesquisa
66.18%
Background: Gait parameters such as gait speed (GS) are important indicators of functional capacity. Frailty Syndrome is closely related to GS and is also capable of predicting adverse outcomes. The cognitive demand of gait control is usually explored with dual-task (DT) methodology. Objective: To investigate the effect of DT and frailty on the spatio-temporal parameters of gait in older people and identify which variables relate to GS. Method: The presence of frailty was verified by Fried's Frailty Criteria. Cognitive function was evaluated with the Mini-Mental State Exam (MMSE) and gait parameters were analyzed through the GAITRite(r) system in the single-task and DT conditions. The Kolmogorov-Smirnov, ANOVA, and Pearson's Correlation tests were administered. Results: The participants were assigned to the groups frail (FG), pre-frail (PFG), and non-frail (NFG). During the DT, the three groups showed a decrease in GS, cadence, and stride length and an increase in stride time (p<0.001). The reduction in the GS of the FG during the DT showed a positive correlation with the MMSE scores (r=730; p=0.001) and with grip strength (r=681; p=0.001). Conclusions: Gait parameters are more affected by the DT, especially in the frail older subjects. The reduction in GS in the FG is associated with lower grip strength and lower scores in the MMSE. The GS was able to discriminate the older adults in the three levels of frailty...

Changes in Standing and Walking Performance Under Dual-Task Conditions Across the Lifespan

Ruffieux, Jan; Keller, Martin; Lauber, Benedikt; Taube, Wolfgang
Fonte: Springer International Publishing Publicador: Springer International Publishing
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
46.45%
Simultaneous performance of a postural and a concurrent task is rather unproblematic as long as the postural task is executed in an automatic way. However, in situations where postural control requires more central processing, cognitive resources may be exceeded by the addition of an attentionally demanding task. This may lead to interference between the two tasks, manifested in a decreased performance in one or both tasks (dual-task costs). Owing to changes in attentional demands of postural tasks as well as processing capacities across the lifespan, it might be assumed that dual-task costs are particularly pronounced in children and older adults probably leading to a U-shaped pattern for dual-task costs as a function of age. However, these changes in the ability of dual-tasking posture from childhood to old age have not yet been systematically reviewed. Therefore, Web of Science and PubMed databases were searched for studies comparing dual-task performance with one task being standing or walking in healthy groups of young adults and either children or older adults. Seventy-nine studies met inclusion criteria. For older adults, the expected increase in dual-task costs could be confirmed. In contrast, in children there was only feeble evidence for a trend towards enlarged dual-task costs. More good-quality studies comparing dual-task ability in children...

Dual-task Coordination in Children and Adolescents with Attention Deficit Hyperactivity Disorder (ADHD)

Inasaridze, Ketevan; Bzhalava, Vera
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 10/01/2011
Relevância na Pesquisa
46.46%
The deficit of executive functioning was found to be associated with attention deficit hyperactivity disorder (ADHD) in general and its subtypes. One of the important functions of central executive is the ability simultaneously coordinate two tasks. The study aimed at defining the dual-task performance characteristics in healthy children and adolescents on the computerised and the paper and pencil dual-task methods; investigating the effect of task difficulty on dual-task performance in ADHD in comparison to age and years of education matched healthy controls; testing if the paper and pencil version of the dual-task method is giving the same results in ADHD and healthy controls; investigating whether the dual-task functioning in ADHD is defined by the deficits in the general motor functioning and comorbidity factors. The study investigated dual task functioning in 6-16 years old 91 typically developing controls and 91 children with ADHD. It was found that: (1) the dual-task coordination is available in children and adolescents with ADHD in general and in its subtypes and not significantly different from performance of age and years of education matched healthy controls; (2) Increase of the task difficulty in dual-task paradigm don't affect disproportionately children and adolescents with ADHD in comparison to age and years of education matched healthy controls; (3) The paper and pencil version of the dual-task method is giving the same results in ADHD and healthy controls as computerised version; (4) The dual-task functioning in ADHD in general and in its subtypes is not defined by the general motor functioning while in healthy controls dual task performance is associated with the general motor functioning level; (5) The dual-task functioning in ADHD in general and in its subtypes is not defined by the comorbidity factors.; Comment: 31 pages...

Os componentes motor e visual de uma tarefa-dupla devem ser associados ou isolados durante o treinamento?; Should motor and visual components of a dual-task be associated or separated during training?

Voos, Mariana Callil; Pinheiro, Gisele Braga; Cicca, Luciana Olcerenko; Lázaro, Andréia; Valle, Luiz Eduardo Ribeiro do; Piemonte, Maria Elisa Pimentel
Fonte: Universidade de São Paulo. Faculdade de Medicina Publicador: Universidade de São Paulo. Faculdade de Medicina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; ; Formato: application/pdf
Publicado em 01/01/2008 POR
Relevância na Pesquisa
56.32%
As atividades diárias requerem o desempenho simultâneo de tarefas (tarefa-dupla), não estando claro se seu treino deve ser realizado com tarefas isoladas ou associadas. Este estudo visou verificar se a aquisição de uma tarefa-dupla ocorre por meio do treinamento de tarefas isoladas ou associadas. Vinte voluntárias foram submetidas a avaliação inicial, treinamento e avaliação final. Dez treinaram as tarefas associadas (TA) e as demais, isoladas (TI). A tarefa motora consistia na alternância de passos do chão a uma plataforma. A tarefa visual consistia na nomeação de dois estímulos (ônibus ou caminhão), um no centro e outro na periferia da tela do computador. O número de passos por segundo na ausência e na presença da tarefa visual, e o número de erros na tarefa visual na ausência e na presença da tarefa motora, foram contados e comparados estatisticamente. O grupo TA apresentou melhora tanto no desempenho motor (inicial 1,10 alternâncias/s, final 1,25 alternâncias/s, p=0,028), quanto no desempenho visual (inicial 9,3 erros, final: 6,9 erros, p=0,039). O mesmo não ocorreu com o grupo TI: a melhora motora não atingiu nível significativo, provavelmente devido à maior variabilidade no número de alternâncias de passo por segundo durante o treinamento...

Does dual task interference affect concurrent duration production?

Merlau, Mary
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
56.27%
Time perception has been cited as a good measure of workload because it seldom interferes with performance of tasks that do not require time estimation, is easy to implement, and is sensitive to task difficulty (Hart, 1975a; Zakay & Shub, 1998). It was hypothesized that duration productions could be used to measure workload caused by two word tasks that would interfere with one another as outlined by Wickens' (1980) multiple resource theory. To test this hypothesis participants estimated a 15 second duration while performing a visual animal name detection task, along with an auditory animal name detection task, or a tone change task. The mean duration produced for the condition with two word tasks was not significantly different from the duration produced for the condition with a word task and a tone task. There was also interference between tasks that should not have produced interference. The results do not support the use of the concurrent duration production method to measure the workload caused by dual nontemporal task interference.

Desempenho de idosos em uma tarefa motora de demanda dupla de controle; Aging motor performance in a dual task control

Gehring, Paula Regina; Bertolassi, Marco Antonio; Nunes, Marcelo Eduardo Souza; Basso, Luciano; Meira Júnior, Cássio de Miranda; Santos, Suely dos
Fonte: Universidade de São Paulo. Escola de Educação Física e Esporte Publicador: Universidade de São Paulo. Escola de Educação Física e Esporte
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; Formato: application/pdf
Publicado em 01/09/2009 POR
Relevância na Pesquisa
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A literatura sobre o processo de envelhecimento tem sistematicamente demonstrado a diferença de desempenho entre populações jovens e idosas. Em geral, os delineamentos de pesquisa envolvem indivíduos de 60 e até mesmo de 90 anos de idade, enquanto o grupo de jovens é representado por indivíduos em torno de 20 anos de idade. Esse procedimento pode ocultar mudanças de desenvolvimento que talvez influencie a interpretação dos resultados. Assim, o objetivo desse estudo foi examinar o efeito da idade cronológica no desempenho de uma habilidade motora. Foi utilizado um aparelho que possibilitou a execução de uma tarefa de posicionamento linear combinada ao controle de força. Os participantes receberam conhecimento de resultados verbal após a execução de 10 tentativas sobre o objetivo de atingir 20% da força máxima e o deslocamento de 35 cm. O desempenho foi medido pelo erro absoluto. A amostra contou com 150 participantes de 60 a 86 anos de idade, que realizaram as tentativas com a mão não-dominante e vendados. Os participantes foram divididos em três grupos etários (60, 70, 80 anos) e o desempenho também foi comparado a um grupo jovem (21 a 30 anos de idade). Houve correlação baixa, mas significante entre idade e controle de distância. Não houve diferença significante entre os grupos (exceto G20 e G80). Apesar da observação empírica dos instrutores sobre a diferença no desempenho motor de idosos de diferentes faixas etárias...