EEG 3 Flashcards

Terms Definitions



multiple frequencies together

creating complex waveforms.
Heaviest element?
uranium (U)
(92 electrons)
Fundamentals of EEG Technology vol 1, pg 33



one dominant

pattern or rhythm


Fast Fourier Transform:
is an algorithm used to process

digital signals and display comparisons of

power (voltage) in various frequency band



Waveforms often associated with

epilepsy such as spikes, sharp waves

or spike and slow waves.


(itis) of a nerve (neur).
Typical conductors
silver (Ag)
copper (Cu)
gold (Au)
platinum (Pt)
tin (Sn)
iron (Fe)
Fundamentals of EEG Technology vol 1, pg 35



Unsteadiness, loss of (a)

muscle coordination (taxia).



Sensory ataxia - loss of coordination

due to feeling, especially the sensation of

position and movement.



a waveform having 3 phases




An electrical potential or potential

 difference expressed in volts.

In EEG, a measurement of the output deflection in mm

multiplied by the sensitivity will obtain the output voltage.




Paralysis of all 4 limbs.
The process of amplification, recording
and analysis of the electrical potentials
of the brain.
Calculation for frequency
1 / duration



Unit of frequency. Cycles per second.

aka “Hz” Named for

Heinrich Randolf

a German physicist and pioneer
in radio communication. We capitalize

the abbreviation because it is a last




a clearly delineated area of the

brain as in a focal temporal spike

or focal slowing.



Pain (algia) along the course

of a nerve (neur).


The feeling of familiarity

in a new situation that is

sometimes an aura (precursor warning)

to an epileptic seizure.



General term meaning a disease (pathy) of the

brain (encephalo).
Not limited to a specific area
voltage values with different signs, one positive and one negative are




occurring in a variety of acute neurologic

conditions, most often with cerebral infarctions. Sharp

waves or sharp spiky complexes mixed with slower

frequencies occurring over one or both hemispheres

(BIPLED) Bilateral

ndependent Periodic Lateralized
Eplileptiform Discharges



A sudden attack or recurrence of convulsions,

temporary loss of consciousness without convulsions,

alterations of consciousness, or motor or sensory

events caused by abnormal electrical activity of a group

of brain cells.

Seizures can cause involuntary changes in body

movement, function, sensation, awareness or behavior.


A benign tumor growing from the arachnoid.



Loss of muscle function caused by injury

or disease of the nerves, brain or spinal cord.

The muscles “

to be cut” (lysis)
on one side (para) of the body




Reduction in the amplitude of EEG activity

Pia Mater-

The innermost layer of the meninges.
REM-Stage Sleep
EOG electro-oculogram picks up eye movemnt while an EMG electromyogram picks up decreased muscle tone in the chin. Sharp theta waves called saw tooth may appear in central areas. Occurs 5-6 times at intervals of 90 min
EEG activity appearing to be composed of one dominant frequency
Insulators are materials which, even when subjected to strong electrical forces, will not readily give up electron.
List insulators
many forms of plastic compounds
air (but if electrical force is very strong, current will flow through it & a spark will occur)
Fundamentals of EEG Technology vol 1, pg 35
cortex is what area?
outer surface of the brain
Fundamentals of EEG Technology vol 1, pg 1

Jamais vu

A “sense of strangeness” when in familiar

surroundings. Opposite of deja vu.

This is a common aura of a temporal lobe

Activation procedures -
Methods used to bring out abnormalities
in the EEG, such as hyperventilation, sleep,
photic stimulation, and eye opening and
closing.These procedures are known to activate or
stimulate abnormalities in some patients

In phase


2 Channels of EEG recording one event

of the same polarity, causing like

deflections with the same timing.
Surface polarity
is described as the negative or positive polarity of a particular activity or waveform at a particular electrode location.
Dysrhythmic Frequency
EEG activity that refers to patterns or rhythms that characteristically appear in patient groups and are rarely seen in healthy subjects
a measure of how much voltage is required to drive a pen a specific distance.
A 60-Hz alternating current completes 1 full cycle in ?
Fundamentals of EEG Technology vol 1, pg 28

Burr Hole-

A hole drilled in the skull. When recording

EEG the amplitude over or near a Burr

hole will increase due to the absence of

the skull as a buffer.


This is called a “Breach Rhythm”

since it is the breach in the skull

which allows more amplitude to be recorded

Cafe-au-lait patches -

Brown patches on the skin seen in

Beta Activity
frequency faster than 13 Hz but in general range of 18-30 Hz Voltage is between 5 and 20 uV. Can be enhanced by tranquilizers and barbiturates.
refers to the shape of the wave form. The shape of a wave or an EEG pattern is determined by the frequencies that combine to make up the waveform and by their phase and voltage relationships.
refers to the reaction of the EEG to stimulation or to a stimulus-related change in morphology.
How many times an event will occur in a given time period. Number of waves per seconds.
Fundamental law of electricity
like charges repel
if 2 paper balls are charge by contact with the same source, they will fly apart when placed next to each other
Fundamentals of EEG Technology vol 1, pg 27
What element is the lightest; containing 1 proton & 1 electron in orbit (containing no neutrons)?
Hydrogen (H)
Fundamentals of EEG Technology vol 1, pg 31
Basic unit of current (I) is?
the ampere (A)
Fundamentals of EEG Technology, vol 1, pg 35
A brain abscess is most like a
________  ________,
where it is a space-occupying lesion & compresses the brain.
brain tumor.
(It causes headaches, alterations in consciousness & depending on location, focal neurological signs)

Fundamentals of EEG Technology vol 2, pg 200
Measurements of the pt's head is in?
centimeters (cm) & millimeters (mm)
Fundamentals of EEG Technology vol 1, pg 17
Alpha activity
Range from 8 to 13 Hz about 85% range in 9.5-10.5 Hz 66% average between 20-60 uV with 28% less than 20 uV
What results occur if wire strands become weakened through corrosion?
wires may become fractured by mechanical stresses results will be massive noise artifact at the input to the amplifier
Fundamentals of EEG Technology, vol 1, pg 132
Generally what are the beginning symptoms of Creutzfeldt-Jakob disease?
begins w/the clinical picture of a personality change followed by progressive dementia
Death occurs in 3 to 12months
Fundamentals of EEG Technology vol 2, pg 202
What would happen if A1 or A2 is the most active electrode & they are interconnected?
it would be difficult to untangle the puzzle of phase reversals & to discover the real source of the activity, which appears in all channels but is local to one
Fundamentals of EEG Technology, vol 1, pg 164 & 165
/ 52

Leave a Comment ({[ getComments().length ]})

Comments ({[ getComments().length ]})


{[ comment.comment ]}

View All {[ getComments().length ]} Comments
Ask a homework question - tutors are online