Definitions for EEG – EEG Exam
Questions and Answers 100% Pass
Electroencephalogram - ✔✔An instrument that generates a record of the electrical
activity of the brain by measuring electric potentials using electrodes attached to the
scalp.
Electroencephalograph - ✔✔A chart of the brain waves picked up by the electrodes
placed on the scalp.
10-20 System - ✔✔A system of electrode application on the scalp using identifiable skull
landmarks as reference.
Distributed using percentages of 10 and 20.
Montage - ✔✔The particular arrangement by which a number of derivations are
displayed simultaneously in an EEG record.
Bipolar Montage - ✔✔Chains of derivations that consist of electrodes along the same
array, where input 2 in one channels in input 1 in the next.
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, Transverse Montage - ✔✔A montage consisting of derivations from pairs along coronal
(transverse) arrays.
Also called a Coronal Bipolar Montage.
Longitudinal Montage - ✔✔A montage consisting of derivations from pairs of
electrodes along longitudinal, usually anterior to posterior, arrays.
Reference Montage - ✔✔An arrangement of derivations in which one input 2 is
common to all channels.
Derivation - ✔✔A pair of electrodes recorded in the EEG.
Polarity - ✔✔The sign of potential different between an electrode affected by the given
potential and another electrode.
Artefact - ✔✔Any potential difference due to an extracerebral source (either
physiological or mechanical) recorded in EEG tracings.
Frequency - ✔✔The rhythmic repetitive activity or the equivalent frequency of isolated
waves.
Rhythmic - ✔✔A constant frequency.
Arrhythmic - ✔✔A sequence of waves of inconstant frequency.
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Questions and Answers 100% Pass
Electroencephalogram - ✔✔An instrument that generates a record of the electrical
activity of the brain by measuring electric potentials using electrodes attached to the
scalp.
Electroencephalograph - ✔✔A chart of the brain waves picked up by the electrodes
placed on the scalp.
10-20 System - ✔✔A system of electrode application on the scalp using identifiable skull
landmarks as reference.
Distributed using percentages of 10 and 20.
Montage - ✔✔The particular arrangement by which a number of derivations are
displayed simultaneously in an EEG record.
Bipolar Montage - ✔✔Chains of derivations that consist of electrodes along the same
array, where input 2 in one channels in input 1 in the next.
Katelyn Whitman, All Rights Reserved © 2025 1
, Transverse Montage - ✔✔A montage consisting of derivations from pairs along coronal
(transverse) arrays.
Also called a Coronal Bipolar Montage.
Longitudinal Montage - ✔✔A montage consisting of derivations from pairs of
electrodes along longitudinal, usually anterior to posterior, arrays.
Reference Montage - ✔✔An arrangement of derivations in which one input 2 is
common to all channels.
Derivation - ✔✔A pair of electrodes recorded in the EEG.
Polarity - ✔✔The sign of potential different between an electrode affected by the given
potential and another electrode.
Artefact - ✔✔Any potential difference due to an extracerebral source (either
physiological or mechanical) recorded in EEG tracings.
Frequency - ✔✔The rhythmic repetitive activity or the equivalent frequency of isolated
waves.
Rhythmic - ✔✔A constant frequency.
Arrhythmic - ✔✔A sequence of waves of inconstant frequency.
Katelyn Whitman, All Rights Reserved © 2025 2
