Electroencephalography
| Definition: |
Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain. |
| Notes: |
/drug eff /rad eff permitted; do not use /util except by MeSH definition; DF: note short X ref |
| Also Called: |
Electroencephalogram |
Electroencephalography Categories.
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Alpha Rhythm - One of four types of brain waves characterized by a relatively high voltage or amplitude and a frequency of 8-13 Hz. They constitute the majority of waves recorded by EEG registering the activity of the parietal and occipital lobes when the individual is awake, but relaxed with the eyes closed. |
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Beta Rhythm - Brain waves with frequency greater than 13 Hz seen on EEG during wakefulness. |
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Cortical Synchronization |
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Delta Rhythm - One of the four types of brain waves seen on EEG characterized by a high amplitude and a frequency of 4 Hz and below. They are considered the "deep sleep waves" observed during sleep in dreamless states, infancy, and in some brain disorders. |
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Theta Rhythm - One of four types of brain waves, characterized by a frequency of 4-7 Hz, usually observed in the temporal lobes when the individual is awake, but relaxed and sleepy. |
Electroencephalography Definitions and Terms
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