Evaluating language comprehension in Alzheimer's disease: the use of the Token test

Neuroimaging criteria and cognitive performance in vascular mild cognitive impairment: A systematic review

The recognition of Cerebrovascular Disease (CVD) at earlier clinical stages may favor the control of vascular risk factors and prevention of dementia. However, operational criteria for symptomatic phases at non-dementia stages are often difficult, as the current criteria normally require the evidence of extensive subcortical disease.

Healthy Aging and Compensation of Sentence Comprehension Auditory Deficits

Objectives. To analyze the effect of aging on sentence auditory comprehension and to study the relationship between this language skill and cognitive functions (attention, working memory, and executive functions). Methods. A total of 90 healthy subjects were divided into three groups: adults (50–59 years), young-old (60–69 years), and old-old (70–80 years). Subjects were assessed using the Revised Token Test. The measures used for performance analysis were number of correct answers (accuracy) and execution time of commands on the different subtests. Results. Regarding accuracy, groups showed similar performance on the first blocks, but the young-old and old-old performed worse than adults on blocks 9 and 10. With respect to execution time, groups differed from block 2 (i.e., the groups differed for all blocks, except for block 1), with the worst performance observed in the old-old group, followed by that of the young-old group. Therefore, the elderly required more time to attain performance similar to that of adults, showing that time measurements are more sensitive for detecting the effects of age. Sentence comprehension ability is correlated with cognitive test performance, especially for global cognition and working memory tests. Conclusions. Healthy aging is characterized by the ability to compensate for difficulties in linguistic processing, which allows the elderly to maintain functional communication.

Linguagem em idosos com doença de Alzheimer: uma revisão sistemática

Resumo: Com o aumento da expectativa de vida, as demências vêm acometendo a população, sendo a doença de Alzheimer a mais comum. Essa se define por um desaparecimento gradativo de memória e de outras funções cognitivas, entre elas, a linguagem. A linguagem humana é importante para estabelecer as ligações interpessoais e promover a inclusão social do indivíduo. O presente artigo teve por objetivo realizar uma revisão sistemática a respeito de trabalhos científicos sobre a associação entre a Doença de Alzheimer e a Linguagem. Os artigos foram pesquisados em três bases de dados: Scielo, Lilacs e Bireme, sendo utilizados como principais descritores de busca bibliográfica: Doença de Alzheimer, Linguagem e Comunicação, no período de outubro a dezembro de 2013. A amostra final formou-se por 07 artigos, sendo incluídos aqueles que caracterizavam a linguagem na Doença Alzheimer em seus diferentes estágios. Através dos resultados desse estudo, foi possível verificar a existência de alterações da linguagem em todos os estágios da Doença e a importância da identificação precoce de tais alterações. Essa identificação pode proporcionar tempo ao paciente e seus familiares de programarem e organizarem seu futuro, buscando serviços de assistência ao paciente, bem como auxílio no processo de comunicação do indivíduo e na qualidade de vida. Esses achados apontam para a importância do conhecimento das principais alterações apresentadas pelos indivíduos com a doença de Alzheimer, sejam elas de linguagem, cognitivas ou de comportamento. É fundamental o desenvolvimento de estudos que contemplem a relação entre testes utilizados para identificarem as principais alterações de linguagem em indivíduos com Doença de Alzheimer.

Evolution of language assessment in patients with acquired neurological disorders in Brazil

The objective of this paper was to describe the evolution of language assessments in patients with acquired neurological diseases over a period of around 45 years from 1970, when interdisciplinarity in Neuropsychology first began in Brazil, to the present day. The first twenty years of data was based on memories of Speech Pathology University Professors who were in charge of teaching aphasia. We then show the contributions of Linguistics, Cognitive Psychology, as well as Psycholinguistic and Psychometric criteria, to language evaluation. Finally, the current panorama of adaptations and creations of validated and standardized instruments is given, based on a search of the databases Pubmed, Scopus and Lilacs. Our closing remarks highlight the diversity in evaluation approaches and the recent tendency of language evaluations linked to new technologies such as brain imaging and computational analysis.

Clinical applicability and cutoff values for an unstructured neuropsychological assessment protocol for older adults with low formal education

BACKGROUND AND OBJECTIVES

The neuropsychological exam plays a central role in the assessment of elderly patients with cognitive complaints. It is particularly relevant to differentiate patients with mild dementia from those subjects with mild cognitive impairment. Formal education is a critical factor in neuropsychological performance; however, there are few studies that evaluated the psychometric properties, especially criterion related validity, neuropsychological tests for patients with low formal education. The present study aims to investigate the validity of an unstructured neuropsychological assessment protocol for this population and develop cutoff values for clinical use.

METHODS AND RESULTS

A protocol composed by the Rey-Auditory Verbal Learning Test, Frontal Assessment Battery, Category and Letter Fluency, Stick Design Test, Clock Drawing Test, Digit Span, Token Test and TN-LIN was administered to 274 older adults (96 normal aging, 85 mild cognitive impairment and 93 mild Alzheimer`s disease) with predominantly low formal education. Factor analysis showed a four factor structure related to Executive Functions, Language/Semantic Memory, Episodic Memory and Visuospatial Abilities, accounting for 65% of explained variance. Most of the tests showed a good sensitivity and specificity to differentiate the diagnostic groups. The neuropsychological protocol showed a significant ecological validity as 3 of the cognitive factors explained 31% of the variance on Instrumental Activities of Daily Living.

CONCLUSION

The study presents evidence of the construct, criteria and ecological validity for this protocol. The neuropsychological tests and the proposed cutoff values might be used for the clinical assessment of older adults with low formal education.

Remission of cognitive deficits in Parkinson's disease: recovery from a nonamnestic mild cognitive impairment or psychiatric symptoms remission?

Mild cognitive impairment is a clinical condition more frequent in patients with Parkinson's disease than in general population. The nonamnestic presentations, usually characterized by executive dysfunction, are most prevalent. We present a case report of a Parkinson's disease patient diagnosed with nonamnestic mild cognitive impairment that showed complete remission of cognitive symptoms after one year. We discuss the possible causes for the remission, focusing on the treatment of medical conditions such as a major depressive episode and vitamin B12 deficiency, in addition to the change of pharmacological treatment. In a third assessment, cognitive performance remained normal. The case report highlights the importance of controlling clinical comorbidities on the assessment and followup of mild cognitive impairment, especially on Parkinson's disease.