Made available in DSpace on 2015-04-14T13:22:00Z (GMT). No. of bitstreams: 1 437216.pdf: 895942 bytes, checksum: f5b95d2182d468d69873678ea24b2f51 (MD5) Previous issue date: 2012-01-17 / Attention is a cognitive function that is very often impaires in neurological disorders, such as stroke or traumatic brain injury (TBI). Among the instruments that evaluate visual selective attention by means of a cancellation paradigm, The Bells Test (BT) is one of the most used and internationally known. The study of hemineglect syndrome in which patients neglect the contralateral or ipsilateral visual hemifield due to a neurological disorder- with tests of attention and visuoperception is still under development. This dissertation aimed to characterize the performance of patients with stroke or TBI in the BT. In the first study, we systematically reviewed articles with cancellation tasks in neuropsychological testing of these populations. Searching with the following keywords representing the constructs cancellation, stroke and TBI in the databases PubMed, PsycINFO and LILACS, we found 86 studies with 26 cancellation paradigms. In the second study we compared the performance between groups of 46 patients after unilateral stroke and 46 matched healthy controls, establishing as well the percentage frequency of deficits and analysed the dissociations between cases in TS. Patients with right brain damage (RBD) showed an inferior accuracy performance when compared to controls, also differing from left brain damaged adults (LBD), showing a slower speed processing. We identified 22% of RBD patients with HN, and a greater prevalence of disorganized strategies. In the third and last study, we compared the performance in TS between TBI patients and matched healthy controls. There was a poorer performance of patients with TBI with a greater number of omissions on the left side and lower speed processing. In addition, suggestive signs of HN were found in 38% of the sample of TBI patients. More research is needed to characterize clinical syndromes regarding the occurrence of HN after a TBI through the traditionally known cancellation paradigm. / A aten??o ? uma das fun??es cognitivas que se encontra muito frequentemente deficit?ria em popula??es cl?nicas neurol?gicas, tais como Acidente Vascular Cerebral e Traumatismo Cranioencef?lico (TCE). O Teste de Cancelamento dos Sinos (TS), dentre os instrumentos que operacionalizam o paradigma de cancelamento destinados ? avalia??o neuropsicol?gica da aten??o concentrada seletiva visual, ? um dos mais utilizados e valorizados internacionalmente. O estudo da hemineglig?ncia s?ndrome em que pacientes negligenciam o hemicampo visual contra ou ipsilateral ? les?o neurol?gica a partir da avalia??o por testes de aten??o e visuopercep??o ainda est? em desenvolvimento. Esta pesquisa buscou caracterizar a avalia??o da aten??o de pacientes com AVC ou TCE por tarefas de cancelamento visual, verificando-se como tais pacientes desempenham no TS. No primeiro estudo, revisaram-se sistematicamente pesquisas com tarefas de cancelamento no exame neuropsicol?gico destas popula??es. Com palavras-chave dos construtos cancelamento, AVC e TCE nas bases de dados PubMed, PsycINFO e LILACS, encontraram-se 86 estudos, com 26 paradigmas de cancelamento. No segundo estudo, foi comparado o desempenho entre grupos de 46 pacientes p?s-AVC unilateral e 46 controles, o percentual da frequ?ncia de d?ficits, e de dissocia??es entre casos no TS. Os pacientes com les?o de hemisf?rio direito (LHD) apresentaram desempenho inferior aos controles em acur?cia, diferenciando-se tamb?m dos com les?o de hemisf?rio esquerdo (LHE) pelo tempo maior de execu??o. Identificaram-se 22% dos pacientes com LHD com HN, al?m de um maior predom?nio de estrat?gias desorganizadas. No terceiro e ?ltimo estudo foi comparado o desempenho de pacientes com TCE e controles pelo TS. Os pacientes com TCE apresentaram pior escore de omiss?es ? esquerda menos direita e maior tempo de execu??o. Foram observados dados sugestivos de HN em 38% da amostra. Mais pesquisas s?o necess?rias para caracterizar as s?ndromes cl?nicas relacionadas ? ocorr?ncia de HN p?s TCE atrav?s do tradicionalmente conhecimedo paradigma de cancelamento.