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Electroencephalography and clinical neurophysiology
EEG amplitudes in healthy, late-middle-aged and elderly adults: normality of the distributions and correlations with age1990 •
The interindividual distributions of EEG amplitudes were evaluated in 60 healthy subjects, aged 56-76. Skew and kurtosis were used to assess the normality of the amplitude distributions in 5 frequency bands (delta, theta, alpha and 2 beta ranges) and 28 scalp derivations while the subjects were awake and rested with their eyes closed and opened. Most of the interindividual EEG amplitude distributions were not normally distributed. Two transformations were applied to the EEG amplitudes: the square root and the natural logarithm. Evaluation of skew and kurtosis indicated that the natural logarithmic transformation was more effective than the square root in reducing the positive skew and leptokurtosis that characterized the untransformed interindividual EEG amplitude distributions. For all frequency bands except theta, the log transformation rendered the distributions approximately normal in form. Correlations between log transformed EEG amplitudes and age were not statistically signif...
Brain signals such as electroencephalogram (EEG) often show oscillations at various frequencies, which are represented as distinct “bumps” in the power spectral density (PSD) of these signals. In addition, the PSD also shows a distinct reduction in power with increasing frequency, which pertains to aperiodic activity and is often termed as the “1/f” component. While a change in periodic activity in brain signals with healthy aging and mental disorders has been reported, recent studies have shown a reduction in the slope of the aperiodic activity with these factors as well. However, these studies only analysed PSD slopes over a limited frequency range (<100 Hz). To test whether the PSD slope is affected over a wider frequency range with aging and mental disorder, we collected EEG data with high sampling rate (2500 Hz) from a large population of elderly subjects (>49 years) who were healthy (N=217) or had mild cognitive impairment (MCI; N=11) or Alzheimer’s Disease (AD; N=5), an...
Neuroscience Letters
Age-dependent features of EEG-reactivity—Spectral, complexity, and network characteristics2010 •
International Journal of Psychophysiology
Age-related changes of spontaneous EEG described by equivalent dipoles1993 •
The Neurodiagnostic journal
Electroencephalography in the elderly2012 •
When the article, "EEGs in Elderly Patients: Technical and Other Considerations" was published in the American Journal of EEG Technology (AJET) in March 1980, the US elderly population was only 10% of the total US population (Hansotia et al. 1980). By the year 2030, it is projected that the elderly will account for nearly 20% of the US population (US Census Bureau 2010). Elderly patients present with a very unique presentation, suggestive of many different differential diagnoses. Elderly patients are more susceptible to seizures than the general adult population. Technologists must be knowledgeable of the normal EEG patterns, normal variants, and unique abnormalities seen in the elderly population. "Geriatric EEG is special" (Klass and Brenner 1995).
Frontiers in Aging Neuroscience
Characteristics of Resting State EEG Power in 80+-Year-Olds of Different Cognitive Status2021 •
Compared with healthy older adults, patients with Alzheimer's disease show decreased alpha and beta power as well as increased delta and theta power during resting state electroencephalography (rsEEG). Findings for mild cognitive impairment (MCI), a stage of increased risk of conversion to dementia, are less conclusive. Cognitive status of 213 non-demented high-agers (mean age, 82.5 years) was classified according to a neuropsychological screening and a cognitive test battery. RsEEG was measured with eyes closed and open, and absolute power in delta, theta, alpha, and beta bands were calculated for nine regions. Results indicate no rsEEG power differences between healthy individuals and those with MCI. There were also no differences present between groups in EEG reactivity, the change in power from eyes closed to eyes open, or the topographical pattern of each frequency band. Overall, EEG reactivity was preserved in 80+-year-olds without dementia, and topographical patterns were...
Human brain …
Sources of Cortical Rhythms In Adults During Physiological Aging: a Multicentric EEG Study2006 •
Revista Brasileira de Direito Comercial
O Artigo 317 do Código Civil e a Teoria da Base Objetiva2019 •
O art. 317 do Código Civil foi esquecido pela doutrina, que conferiu protagonismo aos arts. 478 e seguintes. Contudo, muitas vezes a relação econômica do contrato pode ser alterada e levar a prejuízos, independentemente da onerosidade excessiva. Para essas situações, o art. 317 é um importante dispositivo, vez que trata da revisão judicial por desequilíbrio sinalagmático e prescinde da onerosidade excessiva, vez que adotou uma versão mitigada da teoria da base objetiva, tendo acolhido somente a hipótese de destruição da relação de equivalência, e não regulado a situação de frustração do fim contratual, conforme formulado por Karl Larenz. Assim, neste artigo, será apresentada a lógica por trás deste importante dispositivo, de modo a contribuir para o seu desenvolvimento sistêmico na doutrina e na jurisprudência.
2024 •
2019 •
Francisco Javier Aparicio Mejia
FUNDAMENTOS I DE HIDROLOGÍA DE SUPERFICIE1992 •
Radiotherapy and Oncology
15: Acura Analysis of PSA Kinetics and Late Treatment Related Toxicity in a Phase 2 Randomized Pilot Study Comparing High Dose Rate Brachytherapy and Low Dose Rate Brachytherapy as Monotherapy in Localized Prostate Cancer2020 •
Florida Entomologist
Bee (Hymenoptera: Apoidea: Anthophila) Functional Traits in Relation to Sampling Methodology in a Restored Tallgrass Prairie2019 •
Journal of the American College of Cardiology
Evaluation of Diastolic Function by Cardiac Magnetic Resonance Imaging Using a Novel Feature Tracking Technique and Comparison with Echocardiography in Healthy Subjects2012 •
Journal of chemical research
Antituberculosis, Antifungal and Photoluminescence Studies on a Mn(II)–Neocuproine Complex2012 •
arXiv (Cornell University)
NITS-VC System for VATEX Video Captioning Challenge 20202020 •
International Journal of Pediatrics and Adolescent Medicine
We don't dare to tell her … we don't know where to begin: Disclosure experiences and challenges among adolescents living with HIV and their caregivers in China2018 •