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Richard Caton discovered electrical activity in the cerebral hemispheres of rabbits and monkeys and presented his findings in 1875. [4] Adolf Beck published in 1890 his observations of spontaneous electrical activity of the brain of rabbits and dogs that included rhythmic oscillations altered by light, detected with electrodes directly placed on the surface of the brain. [5]
EEG oscillations in the 4–7 Hz frequency range, regardless of where in the brain they occur or what their functional significance is. The first meaning is usually intended in literature that deals with rats or mice, while the second meaning is usually intended in studies of human EEG recorded using electrodes glued to the scalp.
Specifically, the amplitude of gamma oscillations is reduced, as is the synchrony of different brain regions involved in tasks such as visual oddball and Gestalt perception. People with schizophrenia perform worse on these behavioral tasks, which relate to perception and continuous recognition memory. [34]
Traditional classification of the frequency bands, that are associated to different functions/states of the brain and consist of delta, theta, alpha, beta and gamma bands. . Due to the limited capabilities of the early experimental/medical setup to record fast frequencies, for historical reason, all oscillations above 30 Hz were considered as high frequency and were difficult to investigate.
Another group of brain areas, the limbic system, may lead to feelings of fatigue, while an even deeper structure is likely responsible for the gastrointestinal symptoms.
Beta waves, or beta rhythm, are neural oscillations (brainwaves) in the brain with a frequency range of between 12.5 and 30 Hz (12.5 to 30 cycles per second). Several different rhythms coexist, with some being inhibitory and others excitory in function. [1]
Historically, alpha waves were thought to represent the brain in an idle state as they are strongest during rest and quiet wakefulness. [citation needed] More recently it was found the alpha oscillations increase in demanding task not requiring visual input. In particular, alpha oscillations increase during maintenance (retention) of visually ...
Neuronal oscillations are important components of neuroscience research. During the last two decades, hippocampal oscillations have been a major focus in the research of neuronal oscillations. [3] Among different oscillations present in the brain, SWRs are the first population activity that start in the developing hippocampus. [4]
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