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The genetics of oscillations in the human brain

By B. Porjesz, K. Jones and H. Begleiter


Recording brain electrical activity using scalp electrodes provides a noninvasive, sensitive measure of brain function in humans. These neuroelectric phenomena may be recorded during the continuous electroencephalogram (EEG) when the subject is at rest, and not involved in a task, or one may record the time-specific event-related brain potentials (ERPs) during specific cognitive tasks. These techniques yield spatiotemporal activity maps (i.e. brain activity as it occurs in both space and time). The EEG consists of the activity of an ensemble of generators producing rhythmic activity in several frequency ranges. In the purely resting state, these oscillations are seemingly random; however, with the application of sensory stimulation, they become coupled and act together coherently. This synchronization and enhancement of EEG activity gives rise to an “evoked ” (phase-locked) or “induced ” (nonphase locked) rhythmicity. This rhythmicity may also occur without defined physical stimulation, but may be triggered by cognitive operations. The superimposition of these multiple event-relate

Year: 2014
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