Abstract
During the past few years, many researchers have demonstrated the importance of the age-related changes in spontaneous electroencephalography. However, very little research on of the event-related responses of oscillations connections has been used to examine the changes during normal aging. The aim of the present study was to investigate age-related changes of task-related brain oscillations, which include spectral power and omega-complexity. We hypothesized that the power and omega-complexity of the brain are affected by age-related changes, which could be observed in this study. The samples included young and healthy elderly groups. Compared to young participants, elderly participants were found to have increased power in anterior area and decreased power in posterior area, and have shown a decreased power in the alpha-1 (7 - 10 Hz) and alpha-2 (10 - 13 Hz) bands and an increased power in the delta (1 - 4 Hz) band. Elderly participants were found to have increased omega-complexity in the anterior and posterior brain areas, and have shown an increased omega-complexity in the alpha-2, beta-1 (13 - 18 Hz), and beta-2 (18 - 30 Hz) bands. The findings in this study suggest that power and omega-complexity changes in task-specific neural activity may potentially be used to assess age-related decline in the brain.
Highlights
During the past years, numerous studies have demonstrated the importance of the spatial synchronization of the oscillators in spontaneous electroencephalography (EEG) [1,2]
A previous study of spontaneous EEG, using spectral power analysis, found the delta, alpha-1, and alpha-2 bands to be higher in young people than in healthy aging people [1]
The spectral power values were analyzed to explore the changes of brain oscillation between groups responding to the target stimuli in the various bands
Summary
Numerous studies have demonstrated the importance of the spatial synchronization of the oscillators in spontaneous electroencephalography (EEG) [1,2]. A previous study of spontaneous EEG, using spectral power analysis, found the delta, alpha-1, and alpha-2 bands to be higher in young people than in healthy aging people [1]. Another study reported that omega-complexity values were higher in healthy aging people than in young people [3]. These studies have mainly depended on spontaneous EEG studies of different parts of the brain while their participants were recorded with eyes closed and eyes opened resting state conditions. One of the main focuses of previous EEG and ERP studies lies on pathological oscillatory communication [4], which showed that greater attention is being paid to evoke oscillatory activity in the brain while performing cognitive tasks for assessing disease-related neurophysiologic change. This study focuses on task-related brain oscillations to investigate the age-related features in healthy aging people
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