Electroencephalographic changes after one nigth of sleep deprivation

Abstract

-Total or partial sleep deprivation (SD) causes degrading effects on diff e rent cognitive and psychomotor functions that might be related to electrophysiological changes frequently observed. In the pre sent study, we investigated the effects of one night of sleep deprivation on waking EEG. Experimental protocol consisted of re c o rding electroencephalographic data from eleven healthy young subjects before (baseline) and after (time 2) one night of sleep deprivation. A natural log transformation was carried out and showed a significant increase in theta T6 (p=0.041), O2 (p=0.018) and OZ (p=0.028); and delta T6 (p=0.043) relative power; and a decrease in alpha Fp1 (p=0.040), F3 (p=0.013), Fp2 (p=0.033), T4 (p=0.050), T6 (p=0.018), O2 (p=0.011) and Oz (p=0.025) and beta (p=0.022) absolute power. These outcomes show that the EEG power spectra, after sleep deprivation, exhibit site-specific diff e rences in particular fre q u e ncy bands and corroborate for the premise of local aspects of brain adaptation after sleep deprivation, rather than global.KEY WORDS: sleep deprivation, qEEG, power spectral analysis, cortical activity.Respostas eletrencefalográficas após uma noite de privação de sono RESUMO -Privação total ou parcial de sono causa efeitos deletérios em diferentes funções cognitivas e psicomotoras, que podem estar relacionados às mudanças eletrofísiológicas frequentemente observadas. No p resente estudo, investigou-se os efeitos de uma noite de privação de sono nas respostas eletre n c e f a l ográficas de repouso. O protocolo experimental consistiu na coleta e gravação dos dados do qEEG de onze sujeitos jovens e saudáveis antes (momento baseline) e após (momento 2) uma noite de privação de sono. Todos os dados sofreram transformação logarítmica, que evidenciou um aumento significativo nas potên-cias relativas de teta T6 (p=0,041), O2 (p=0,018) e OZ (p=0,028); e delta T6 (p=0,043). As bandas de freqüência mais rápidas alfa Fp1 (p=0,040), F3 (p=0,013), Fp2 (p=0,033), T4 (p=0,050), T6 (p=0,018), O2 (p=0,011), Oz (p=0,025) e beta (p=0,022) apresentaram reduções significativas na potência absoluta. Os re s u l t a d o s demonstram que o espectro de potência exibe diferenças específicas em freqüências de bandas difere n t e s , e corroboram para a premissa de que o cére b ro, após privação ou perda de sono, promove ajustes e adaptações locais, ao invés de globais. PALAVRAS-CHAVE: privação de sono, qEEG, análise do espectro de potência, atividade cortical.

Global field synchronization reveals rapid eye movement sleep as most synchronized brain state in the human EEG

“…Furthermore, previous studies have shown that these bands are sensitive to prolonged periods of waking [12,18,19]. Subject average and standard deviation of GFS in these bands as a function of time awake and clock time is shown in figure 4 for eyes open (red circles) and closed (blue circles).…”

Effects of Caffeine on Electrophysiological and Neuropsychological Indices after Sleep Deprivation

“…Furthermore, the main effects of quadrant were expected once EEG activity is different in each scalp area. In addition, the differences among moments were also expected, since sleep deprivation induces changes in the qEEG variables [29][30][31] . In this sense, the main effects observed in the present study were not due to caffeine ingestion itself.…”

Disrupted directed connectivity along the cingulate cortex determines vigilance after sleep deprivation

“…The factors that were manipulated in our study (‘eyes open’ and ‘sleep deprivation’) are known to strongly affect resting-state EEG alpha power (8 – 12 Hz) (Corsi-Cabrera et al, 1992; Ferreira et al, 2006). Therefore, we considered it necessary to rule out the possibility that their estimated effects on effective connectivity were merely secondary to changes in alpha power.…”