the relation between eeg prefrontal asymmetry and subjective feelings of mood following 24 hours of sleep deprivation relação entre assimetria pré-frontal no eeg e sensações subjetivas de humor após 24 horas de privação de sono

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ID: 199243
2006
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Abstract
Several studies have investigated the relationship between asymmetrical EEG activity over the frontal cortex and mood. This study aimed at investigating the association between state fluctuations in frontal alpha EEG asymmetry and state changes followed by 24 h of sleep deprivation (SD). Our results show that sleep deprivation caused a significant alteration in the asymmetry values. Activation shifted from the left hemisphere, before SD, to the right hemisphere, after SD, in all frontal electrode pairs. In addition, according to the self-rating scale of SD-related mood effects, subjects became significantly less alerted and active, and sleepier. According to these results, increased right prefrontal activation might be potentially associated with the negative mood states typically seen after sleep deprivation, although the causal relationship is still uncertain. However, more studies will be necessary to establish the viability of EEG asymmetry and the cerebral lateralization hypothesis to explain the SD-related affective changes.
Diversos estudos têm investigado a relação entre a atividade assimétrica do EEG no córtex frontal e mudanças no humor. Adotando tal abordagem, o presente estudo teve como objetivo investigar a associação entre os estados de oscilação na assimetria frontal de alfa e mudanças no estado emocional ou motivacional após 24h de privação de sono. Os resultados mostram que 24h de privação de sono ocasionaram alterações significativas nos valores de assimetria. Ativação cerebral mudou do hemisfério esquerdo, antes da privação de sono, para o hemisfério direito, após a privação de sono, em todos os pares de eletrodos frontais. Além disso, de acordo com a escala relacionada aos efeitos subjetivos do humor após privação de sono, os sujeitos mostraram-se significativamente menos alerta e ativos e mais sonolentos. É possível que as duas variáveis estejam associadas, embora a relação causal seja ainda incerta. Estudos serão ainda necessários para que se possa estabelecer a viabilidade da assimetria pré-frontal e da hipótese de lateralização cerebral na elucidação de mudanças emocionais relacionadas à privação ou falta de sono.
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Authors ;Camila Ferreira;Andréa Deslandes;Helena Moraes;Maurício Cagy;Luiz Fernando Basile;Roberto Piedade;Pedro Ribeiro
Journal communications in computer and information science
Year 2006
DOI
10.1590/S0004-282X2006000300006
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X2006000300006
Keywords
sleep deprivation neuropsychiatry biological psychiatry eeg prefrontal asymmetry

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