A study of electrical current within the brain. Electrodes are attached to the scalp. Wires attach these electrodes to a machine which records the electrical impulses. The results are either printed out or displayed on a computer screen. Electroencephalogram is abbreviated EEG. Different patterns of electrical impulses can denote various problems within the brain including different forms of epilepsy. Most EEGs see only a moment in time within the brain, and can catch only gross abnormalities in function. An overnight EEG is designed to check the electrical activity in the brain of a sleep-deprived patient, increasing the chance that seizure activity will be revealed. Also available are 24- or 48-hour EEGs, which measure electrical activity over one or two days, usually using mobile EEG units.
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The record obtained by means of the electroencephalograph.
- flat e. SYN: electrocerebral silence.

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elec·tro·en·ceph·a·lo·gram -in-'sef-ə-lə-.gram n the tracing of brain waves made by an electroencephalograph

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elec·tro·en·ceph·a·lo·gram (EEG) (e-lek″tro-en-sefґə-lo-gram″) a recording of the potentials on the skull generated by currents emanating spontaneously from nerve cells in the brain. The normal dominant frequency of these potentials is about 8 to 10 cycles per second and the amplitude about 10 to 100 microvolts. Fluctuations in potential are seen in the form of waves, which correlate well with different neurologic conditions and so are used as diagnostic criteria. See also brain waves, under wave.

Electroencephalogram. Recordings made while the subject was excited, relaxed, and in various stages of sleep. During excitement the brain waves are rapid and of small amplitude, whereas in sleep they are much slower and of greater amplitude.

Medical dictionary. 2011.

Look at other dictionaries:

  • electroencephalogram — 1934, from ELECTRO (Cf. electro ) + encephalo (see ENCEPHALITIS (Cf. encephalitis)) + GRAM (Cf. gram) …   Etymology dictionary

  • electroencephalogram — [ē lek΄trōen sef′ə lō gram΄] n. [ ELECTRO + ENCEPHALO + GRAM] a graphic tracing of minute voltage changes resulting from bioelectric activity in the brain: abbrev. EEG …   English World dictionary

  • electroencephalogram — UK [ɪˌlektrəʊenˈsefələˌɡræm] / US [ɪˌlektroʊenˈsefələˌɡræm] noun [countable] Word forms electroencephalogram : singular electroencephalogram plural electroencephalograms medical an EEG 1) …   English dictionary

  • electroencephalogram — elektroencefalograma statusas T sritis Standartizacija ir metrologija apibrėžtis Galvos smegenų bioelektrinių potencialų įrašai elektroencefalografo juostoje. atitikmenys: angl. electroencephalogram vok. Elektroenzephalogramm, n rus.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • electroencephalogram — noun Etymology: International Scientific Vocabulary Date: 1934 the tracing of brain waves made by an electroencephalograph …   New Collegiate Dictionary

  • electroencephalogram — /i lek troh en sef euh leuh gram /, n. Med. a graphic record produced by an electroencephalograph. Abbr.: EEG [1930 35; ELECTRO + ENCEPHALOGRAM] * * * …   Universalium

  • electroencephalogram — noun A recording of electrical brain activity made by an electroencephalograph. See Also: alpha wave, beta wave, electroencephalograph, electroencephalography …   Wiktionary

  • electroencephalogram — e|lec|tro|en|ceph|a|lo|gram [ıˌlektrəuınˈsefələgræm, trəuen US trou ] n [Date: 1900 2000; Origin: electro + encephalogram, from Greek kephale head ] technical an ↑EEG …   Dictionary of contemporary English

  • electroencephalogram — e|lec|tro|en|ceph|a|lo|gram [ ı,lektrouen sefələ,græm ] noun count an EEG …   Usage of the words and phrases in modern English

  • electroencephalogram — n. graphic record of the electrical activity of the brain (made by an electroencephalograph) …   English contemporary dictionary

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