Definitions for EEG – EEG UPDATED
ACTUAL Questions and CORRECT
Answers
Electroencephalogram - CORRECT ANSWER - An instrument that generates a record of
the electrical activity of the brain by measuring electric potentials using electrodes attached to
the scalp.
Electroencephalograph - CORRECT ANSWER - A chart of the brain waves picked up by
the electrodes placed on the scalp.
10-20 System - CORRECT ANSWER - A system of electrode application on the scalp
using identifiable skull landmarks as reference.
Distributed using percentages of 10 and 20.
Montage - CORRECT ANSWER - The particular arrangement by which a number of
derivations are displayed simultaneously in an EEG record.
Bipolar Montage - CORRECT ANSWER - Chains of derivations that consist of electrodes
along the same array, where input 2 in one channels in input 1 in the next.
Transverse Montage - CORRECT ANSWER - A montage consisting of derivations from
pairs along coronal (transverse) arrays.
Also called a Coronal Bipolar Montage.
Longitudinal Montage - CORRECT ANSWER - A montage consisting of derivations from
pairs of electrodes along longitudinal, usually anterior to posterior, arrays.
, Reference Montage - CORRECT ANSWER - An arrangement of derivations in which one
input 2 is common to all channels.
Derivation - CORRECT ANSWER - A pair of electrodes recorded in the EEG.
Polarity - CORRECT ANSWER - The sign of potential different between an electrode
affected by the given potential and another electrode.
Artefact - CORRECT ANSWER - Any potential difference due to an extracerebral source
(either physiological or mechanical) recorded in EEG tracings.
Frequency - CORRECT ANSWER - The rhythmic repetitive activity or the equivalent
frequency of isolated waves.
Rhythmic - CORRECT ANSWER - A constant frequency.
Arrhythmic - CORRECT ANSWER - A sequence of waves of inconstant frequency.
Voltage - CORRECT ANSWER - The amplitude of a waveform. Refers to the average
voltage or peak voltage of EEG activity.
Attenuation - CORRECT ANSWER - The reduction of amplitude of EEG activity
resulting from decreased voltage.
Hypersynchrony - CORRECT ANSWER - An increase in voltage and regularity of
rhythmic activity.
Paroxysmal - CORRECT ANSWER - Activity that emerges from the background with a
rapid onset.
ACTUAL Questions and CORRECT
Answers
Electroencephalogram - CORRECT ANSWER - An instrument that generates a record of
the electrical activity of the brain by measuring electric potentials using electrodes attached to
the scalp.
Electroencephalograph - CORRECT ANSWER - A chart of the brain waves picked up by
the electrodes placed on the scalp.
10-20 System - CORRECT ANSWER - A system of electrode application on the scalp
using identifiable skull landmarks as reference.
Distributed using percentages of 10 and 20.
Montage - CORRECT ANSWER - The particular arrangement by which a number of
derivations are displayed simultaneously in an EEG record.
Bipolar Montage - CORRECT ANSWER - Chains of derivations that consist of electrodes
along the same array, where input 2 in one channels in input 1 in the next.
Transverse Montage - CORRECT ANSWER - A montage consisting of derivations from
pairs along coronal (transverse) arrays.
Also called a Coronal Bipolar Montage.
Longitudinal Montage - CORRECT ANSWER - A montage consisting of derivations from
pairs of electrodes along longitudinal, usually anterior to posterior, arrays.
, Reference Montage - CORRECT ANSWER - An arrangement of derivations in which one
input 2 is common to all channels.
Derivation - CORRECT ANSWER - A pair of electrodes recorded in the EEG.
Polarity - CORRECT ANSWER - The sign of potential different between an electrode
affected by the given potential and another electrode.
Artefact - CORRECT ANSWER - Any potential difference due to an extracerebral source
(either physiological or mechanical) recorded in EEG tracings.
Frequency - CORRECT ANSWER - The rhythmic repetitive activity or the equivalent
frequency of isolated waves.
Rhythmic - CORRECT ANSWER - A constant frequency.
Arrhythmic - CORRECT ANSWER - A sequence of waves of inconstant frequency.
Voltage - CORRECT ANSWER - The amplitude of a waveform. Refers to the average
voltage or peak voltage of EEG activity.
Attenuation - CORRECT ANSWER - The reduction of amplitude of EEG activity
resulting from decreased voltage.
Hypersynchrony - CORRECT ANSWER - An increase in voltage and regularity of
rhythmic activity.
Paroxysmal - CORRECT ANSWER - Activity that emerges from the background with a
rapid onset.
