Transformations towards the normal distribution of broad band spectral parameters of the EEG

Gasser, Théo; Bächer, Petra; Möcks, Joachim

doi:10.1016/0013-4694(82)90112-2

Cited by 569 publications

(256 citation statements)

References 6 publications

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“…To normalize the distribution, EEG alpha power values were natural logarithm-transformed (Gasser et al, 1982). EEG asymmetry scores were computed as the difference between natural logarithm (ln) of EEG alpha power at the right recording site and the left recording site (ln (right) -ln (left); e.g., F3/4 = ln (F4) -ln (F3)).…”

Section: Methodsmentioning

confidence: 99%

Long-term stability of electroencephalographic asymmetry and power in 3 to 9 year-old children

Vuga

Fox

Cohn

et al. 2008

International Journal of Psychophysiology

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We investigated test-retest stability of resting EEG asymmetry and power in the alpha frequency range across a 0.6 -to 3-year interval in 125 children (57 girls and 68 boys) for two age groups, 87 preschool children (3 to 5 year-olds) and 38 school-age children (6 to 9 year-olds). Children were from families with a parent's history of unipolar or bipolar depression (36 girls and 43 boys) or control families with no parent history of depression nor any other psychiatric disorder (21 girls and 25 boys). Frontal EEG asymmetry stability was low to moderate; intraclass correlations ranged from zero to 0.48 in the eyes-open condition, and from 0.19 to 0.45 in the eyes-closed condition. Also, parietal EEG asymmetry was low to moderate; intraclass correlations ranged from 0.21 to 0.52 in the eyes-open condition and from 0.27 to 0.72 in the eyes-closed condition. Stability of EEG asymmetry was not related to age, sex of the child, or parent's history of mood disorder. Frontal and parietal EEG power appeared moderately to highly stable. Intraclass correlations were between 0.65 and 0.86 in the eyes-open condition and between 0.52 and 0.90 in the eyes-closed condition. Although stability of EEG power was not statistical significantly different between preschool and school-age children, it consistently showed higher stability values in school-age children than in preschool children. Stability in school-aged children approached values as has been reported for adults. The findings provide partial support to the concept of frontal EEG asymmetry as a trait marker in childhood.

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Section: Methodsmentioning

confidence: 99%

Long-term stability of electroencephalographic asymmetry and power in 3 to 9 year-old children

Vuga

Fox

Cohn

et al. 2008

International Journal of Psychophysiology

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“…Similarly, the mean power across electrodes outside of the network was calculated. Since EEG power was not normally distributed, the values were natural log transformed (Gasser et al, 1982).…”

Section: Eeg Data Acquisition and Processingmentioning

confidence: 99%

“Can waiting awaken the resting brain?” A comparison of waiting- and cognitive task-induced attenuation of very low frequency neural oscillations

et al. 2013

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The default mode network (DMN) is characterised by coherent very low frequency (VLF) neural oscillations in the resting brain. The attenuation of this activity has been demonstrated following the transition from rest to performance of a broad range of cognitive goal-directed tasks. Whether the activity of resting state VLF oscillations is attenuated during non-cognitive goal-directed tasks such as waiting for rewarding outcomes is not known. This study examined the VLF EEG power from resting to performance of attention demanding task and two types of goal-directed waiting tasks. The association between the attenuation of VLF EEG power and Attention-Deficit/Hyperactivity Disorder (ADHD) symptoms was examined.Direct current EEG (DC-EEG) data was collected from 32 healthy young adults (half high and half low ADHD symptom scorers) during (i) a rest state, (ii) while performing a cognitive demanding reaction time task (2CRT), and (iii) while undertaking each of two different goal-directed waiting conditions: "forced-to-wait (FW)" and "choose-to-wait (CW)" tasks. The spatial distribution of VLF EEG power across scalp was similar to that seen in previous resting VLF EEG studies. Significant rest-to-task attenuation of VLF EEG power occurred during the 2CRT and the CW task, but not during the FW task. The association between self-ratings of ADHD symptoms and waiting-induced attenuation was not significant. This study suggests VLF EEG power attenuation that occurs following rest to task transition is not simply determined by changes in cognitive load. The goal-directed nature of a task, its motivated nature and/or the involvement of effortful attention may also contribute.Future studies should explore the attenuation of resting state VLF oscillations during waiting and impulsive choice.

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“…To increase statistical power, we attempted to normalize SL parameters by means of a transformation that is commonly used when trying to normalize relative spectral power (Gasser et al 1982), a neurophysiological variable that also varies between 0 and 1; log10[x/(1 -x)]. Unfortunately, several parameters could not be sufficiently normalized by means of this transformation to pass Kolmogorov-Smirnov tests of normality.…”

Section: Synchronization Likelihoodmentioning

confidence: 99%

MEG resting state functional connectivity in Parkinson’s disease related dementia

et al. 2008

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Parkinson's disease (PD) related dementia (PDD) develops in up to 60% of patients, but the pathophysiology is far from being elucidated. Abnormalities of resting state functional connectivity have been reported in Alzheimer's disease (AD). The present study was performed to determine whether PDD is likewise characterized by changes in resting state functional connectivity. MEG recordings were obtained in 13 demented and 13 non-demented PD patients. The synchronization likelihood (SL) was calculated within and between cortical areas in six frequency bands. Compared to non-demented PD, PDD was characterized by lower fronto-temporal SL in the alpha range, lower intertemporal SL in delta, theta and alpha1 bands as well as decreased centro-parietal gamma band synchronization. In addition, higher parieto-occipital synchronization in the alpha2 and beta bands was found in PDD. The observed changes in functional connectivity are reminiscent of changes in AD, and may reflect reduced cholinergic activity and/or loss of cortico-cortical anatomical connections in PDD.

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Transformations towards the normal distribution of broad band spectral parameters of the EEG

Cited by 569 publications

References 6 publications

Long-term stability of electroencephalographic asymmetry and power in 3 to 9 year-old children

Long-term stability of electroencephalographic asymmetry and power in 3 to 9 year-old children

“Can waiting awaken the resting brain?” A comparison of waiting- and cognitive task-induced attenuation of very low frequency neural oscillations

MEG resting state functional connectivity in Parkinson’s disease related dementia

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