Auditory Evoked Potential

Auditory Evoked Potential - closed it becomes large Focus...

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Auditory Evoked Potential Zijing Zhao, Wenhao Chen, Ziyang Li
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What is an electroencephalogram?(EEG) When the neurons of the human brain process information, they do so by changing the flow of electrical currents across their membranes. These changing currents generate electric and magnetic fields that can be recorded from the surface of the scalp. The electric fields are measured by attaching small electrodes to the scalp.
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How does EEG work? EEG recordings show the overall activity of the millions of neurons in the brain. The recordings show fluctuations with time that are often rhythmic in the sense that they alternate regularly
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How does EEG work? The most prominent rhythm in the EEG is the alpha rhythm which has a frequency between 8 and 13 cycles per second and is recorded mainly over the posterior regions of the scalp close to the places in the brain that process visual information. When the eyes are open the alpha rhythm is very small and when the eyes are
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Unformatted text preview: closed it becomes large Focus on Evoked Potential The evoked potential is the change in brain's electrical activity that follows a stimulus such as a click. The evoked potential is usually too small to recognize in all of the other activity recorded from the brain. When the subject hears a click, his/her brain may also be evaluating what the eyes are seeing, thinking about what to have for supper, or controlling the hand as it is writing. Each of these activities will be associated with its own particular electric and magnetic fields. The specific patterns associated with the click can be measured if the click is repeated many times. Each time the click occurs the evoked potential to the click will be the same, but all of the other activity going on in the brain will change. If we average all of the recordings together, the other activity, being different every time the click occurs, tends to cancel itself out , leaving the response to the click...
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Auditory Evoked Potential - closed it becomes large Focus...

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