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How many items from a word list can Alzheimer's disease patients and normal controls recall? Do they recall in a similar way?

Quantos itens de uma lista de palavras podem lembrar pacientes com doença de Alzheimer e controles normais? Eles lembram de forma similar?

Abstract

The serial position effect occurs when individuals are asked to recall a list of information that exceeds normal attention span. Alzheimer's disease (AD) patients show lower scores on word span recall tests when compared to healthy aging subjects, younger individuals or depressed patients.

Objective:

To evaluate the immediate free recall and the serial position effect of a 10-word list, emotionally neutral in tone, in Alzheimer's disease (AD) patients and two age-groups of healthy controls.

Methods:

The free word recall test was applied in a sample of 44 mild AD outpatients and 168 >50 year and 173 ≤50 year-old healthy controls. The span of recalled words and order of recollection of each item was recorded. Scores for serial position effect were analyzed. MMSE scores were recorded for all participants. Descriptive statistics and the ANOVA with Tukey test were performed.

Results:

The controls scored significantly better than AD patients on the MMSE and word span (p=0.0001). Older controls word span mean ±SD was 5.65±1.75, younger controls was 5.99±1.27, and AD patients was 2.86±1.42. The best recalled item in all groups was the first item of the list. Primacy was observed across the three groups, although AD patients presented lower scores. Recency was diminished among AD patients compared to control groups.

Conclusions:

Primacy effect was observed in AD patients as well as in both normal control groups. Recency effect was presented by the normal control groups but was extremely poor among AD patients. The first item was universally best retrieved.

Key words:
immediate recall; neuropsychological tests; memory; Alzheimer's disease; elderly; aging.

Resumo

O efeito de posição de palavras numa lista (posição serial) ocorre quando o indivíduo é solicitado a recuperar informação que excede sua capacidade de atenção. Pacientes com doença de Alzheimer (DA) apresentam escores mais baixos nos testes de recuperação de palavras, quando comparados com idosos sadios ou pacientes com depressão.

Objetivo:

Avaliar a evocação imediata livre e o efeito da posição serial de uma lista de 10 palavras, de conteúdo emocional neutro, em pacientes com doença de Alzheimer (DA) e dois grupos etários de controles saudáveis.

Métodos:

O teste de evocação livre de palavras foi aplicado em uma amostra de 44 pacientes com DA leve ambulatoriais e 168 controles saudáveis com idade >50 anos e 173 com idade ≤50 anos. O escore da evocação de palavras e a ordem de evocacão de cada item foram registrados. Escores para o efeito da posição seriada foram analisados. O Mini Exame do Estado Mental foi também obtido de todos os participantes. Análise descritiva e ANOVA de uma via com teste de Tukey post hoc foram realizados.

Resultados:

Os controles obtiveram escores significativamente mais altos do DA no MEEM e span de palavras (p=0.0001). A extensão de palavras dos controles mais velhos mostrou uma média±DP 5,65±1,75, controls mais jovens foi 5,99±1,27, e pacientes com DA foi 2,86±1,42. O item melhor lembrado em todos os grupos foi o primeiro da lista. O efeito de primazia foi observado nos três grupos, ainda que pacientes com DA tenham apresentado os escores mais baixos. Recência mostrou-se reduzida entre os pacientes em relação aos grupos controles.

Conclusões:

O efeito de primazia foi observado nos pacientes com DA bem como nos dois grupos controles normais. O efeito de recência foi apresentado pelos grupos controles normais, mas de forma extremamente empobrecida pelos pacientes com Alzheimer. O primeiro item da lista foi universalmente melhor evocado.

Palavras-chave:
evocação imediata,testes neuropsicológicos,memória,doença de Alzheimer,idoso,envelhecimento.

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Publication Dates

  • Publication in this collection
    Jan-Mar 2007
Academia Brasileira de Neurologia, Departamento de Neurologia Cognitiva e Envelhecimento R. Vergueiro, 1353 sl.1404 - Ed. Top Towers Offices, Torre Norte, São Paulo, SP, Brazil, CEP 04101-000, Tel.: +55 11 5084-9463 | +55 11 5083-3876 - São Paulo - SP - Brazil
E-mail: revistadementia@abneuro.org.br | demneuropsy@uol.com.br