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Psicologia, Saúde & Doenças

versión impresa ISSN 1645-0086

Psic., Saúde & Doenças v.2 n.1 Lisboa jul. 2001

 

Conteúdo visual em sonhos de cegos

Helder Bértolo & Teresa Paiva

Laboratório EEG/Sono – Centro de Estudos Egas Moniz – Faculdade de Medicina de Lisboa

 

Resumo: O presente estudo visa estabelecer correlações entre parâmetros espectrais do EEG de sono e as variáveis dos relatos oníricos, particularmente os conteúdos visuais, e analisar as diferenças entre fases REM (sono paradoxal) e NREM (sono lento) em sonhos de cegos. Oito voluntários cegos com idades entre 21 e 43 anos, de ambos os sexos, foram registados durante duas noites de polissonografia ambulatória no domicílio. Os voluntários foram acordados por telefone, sem qualquer interacção pessoal, a cada 90 minutos, de forma a relatarem os seus sonhos. Foram realizadas análises de conteúdo baseadas nos critérios Hall e Van de Castle e análises espectrais no EEG de sono (nos 5 minutos anteriores a cada acordar). Os voluntários apresentaram conteúdos visuais nos seus relatos oníricos com diferenças entre acordares em fases REM e NREM: sendo a maior incidência durante o sono paradoxal. Foram encontradas correlações consistentes entre as variáveis dos relatos e os parâmetros espectrais do EEG de sono. A taxa de actividade visual correlaciona-se positivamente com as altas frequências do EEG (>25Hz) e negativamente com a banda alfa. Em conclusão, os voluntários cegos relatam conteúdos visuais nos seus sonhos, maioritariamente durante sono REM, que se correlacionam significativamente com as bandas espectrais de frequência.

Palavras chave: Cegos, EEG, Sonhos.

 

Visual contents of dreams of blind people

Abstract: The aims of this study are: to identify relationships between sleep EEG patterns and reports of dreams, more specifically visual reports, and to inspect differences between REM stages and NREM stages in dreams of blind people. A sample of eight subjects (ages between 21 and 43 years), half females, with more than 12 years of school participate voluntarily. Registers were taken in two consecutive nights, at home. Participants were awaken by telephone every 90 minutes, and were asked to relate their dreams. Content analysis of dreams were made based on the protocol of Hall & Van De Castle and spectral analysis of EEG in the five minutes before each wake up. Participants relate different visual contents in stage REM and NREM, with higher incidence during paradoxistic sleep. Correlations were found between the reports and EEG. Visual activity correlate positively with high EEG frequencies (>25Hz) and negatively with Alpha band. In conclusion the blind participants report visual contents of dreams mainly during REM sleep, which correlate significantly with spectral band frequencies.

Key words: Blinds, Dreams, EEG.

 

Texto completo disponível apenas em PDF.

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