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Definitions for EEG – EEG Exam Questions and Answers 100% Pass
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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 picke...

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  • January 9, 2025
  • 11
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • definitions for eeg eeg exam questions and answe

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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.


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.


Author. Emily Charlene, ©2025 All Rights Reserved.

, 2|Page


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.


Voltage - ✔✔The amplitude of a waveform. Refers to the average voltage or peak voltage of EEG activity.


Attenuation - ✔✔The reduction of amplitude of EEG activity resulting from decreased voltage.


Hypersynchrony - ✔✔An increase in voltage and regularity of rhythmic activity.


Paroxysmal - ✔✔Activity that emerges from the background with a rapid onset.


Morphology - ✔✔The shape of a waveform.


Monomorphic - ✔✔One dominant waveform.


Polymorphic - ✔✔Multiple frequencies that combine to form a complex waveform.


Sinusoidal - ✔✔Waves resembling sine waves. Monomorphic activity is usually sinusoidal.


Transient - ✔✔An isolated wave or pattern that is distinctly different from the background activity.


Spike - ✔✔A transient waveform with a pointed peak and duration of 20-70 milliseconds.




Author. Emily Charlene, ©2025 All Rights Reserved.

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