A method for measuring the electrical activity of the brain. Electrodes placed on the scalp are able to detect weak electrical signals produced by neural activity. go to glossary index
Amplification recording and analysis of electrical activity of brain.
A noninvasive, diagnostic technique that records the electrical impulses produced by brain cell activity. An EEG reveals characteristic brain wave patterns that may assist in the diagnosis of particular neurologic conditions, such as seizure disorders, impaired consciousness, and brain lesions or tumors.
a diagnostic procedure in which the electrical impulses from the brain are traced and recorded from metal electrodes attached to the surface of the head.
A painless, diagnostic technique that amplifies and records electrical activity in the brain.
Analysis of the electrical activity of the brain. This is sometimes referred to as EEG (electroencephalogram).
The process where, during an EEG, a machine creates line tracings to record electrical activity in the brain.
A procedure for recording the electrical impulses of brain activity.
A system of recording the rhythmic waves of electric energy discharged by the nerve cells in the brain. Normal waves (alpha waves) occur with a frequency between 8–12 per second, abnormal waves (delta waves) with a frequency of 7 per second, or less. Abnormal waves occur in cases of brain tumour and in epilepsy. The tracing produced is termed an electroencephalogram. (See also Epilepsy; Hypsarrhythmia)
a method of recording brain activity using an electroencephalograph, a device which records electrical current.
A diagnostic procedure that records, via electrodes attached to various areas of the persons head, electrical activity generated by brain cells.
Examination of the electrical activity of the brain, for the purpose of disease diagnosis.
The EEG measures the electrical activity of the brain and generates a series of wave forms. Slow waves indicate deranged function of brain bordering tumors and infarcts. Polyphasic Unites of Reduced Amplitude and Duration - This indicates destruction or impairment of scattered fibers within a motor unit from diseases such as polymyositis, the muscular dystrophies, and other myopathies. Fibrillation and Giant Motor Unit Potentials - Fibrillation indicates contraction of a single muscle fibers and appears only when destruction of a motor neuron has disintegrated its motor unit. Giant potentials arise from.motor units containing more than the usual number of muscle fibers spread out over a greatly enlarged territory within the muscle. The occurrence of both together indicates reinnervation of disease muscle from peripheral neuropathy, muscular dystrophy, myositis, etc.
Electroencephalography is the neurophysiologic measurement of the electrical activity of the brain by recording from electrodes placed on the scalp or, in special cases, subdurally or in the cerebral cortex. The resulting traces are known as an electroencephalogram (EEG) and represent an electrical signal (postsynaptic potentials) from a large number of neurons. These are sometimes called brainwaves, though this use is discouraged.