Discrimination of Alzheimer's disease and mild cognitive impairment by equivalent EEG sources: a cross-sectional and longitudinal study

Evaluation of spectral ratio measures from spontaneous MEG recordings in patients with Alzheimer's disease

“…AD patients show a decrease of coherence values at the α and β bands in EEG [14,15], together with a slowing of spontaneous electrical brain activity. An increase of the δ (0.5-4 Hz) and θ (4-8 Hz) power, along with a decrease of the α (8-13 Hz) and β (13-30 Hz) power have been widely reported in EEG studies [16][17][18][19]. Results are in accordance with those obtained defining several power ratios to study EEG recordings [20−24].…”

“…EEG and MEG slowing have not only been observed in AD, but also in other forms of dementia as mild cognitive impairment [18,19,32], vascular dementia [25,27], dementia associated with Parkinson's disease [26,48], Lewy body dementia [26,28,49], major depression [50,51], Huntington's chorea and progressive supranuclear palsy [16,26]. Further investigation should be attempted in order to study differences in slowing for every disorder.…”

MEG spectral analysis in subtypes of mild cognitive impairment

“…When the progression to AD was investigated, alpha and theta relative power in left temporooccipital derivation correctly classified 85 % of MCI subjects who would suffer dementia . Huang et al (2000) demonstrated that a more anterior localization of theta and alpha activity was the best predictor of future conversion to AD within a MCI sample. Of note, the investigation of differential neurophysiological patterns in MCI subtypes is scarce.…”

Right ear advantage for vocal communication in frogs results from both structural asymmetry and attention modulation

“…Studies comparing absolute and relative EEG power show that absolute power may yield different results from those obtained using relative power [39][40][41]. Because relative power values exhibit lower group variability than absolute power values and are not affected by the electrical volume conductor properties of the head which influences EEG amplitude [39], relative power is more suitable for comparison between different channels.…”