Frequency Verbatim Flashcards Preview

EEG Frequency Definitions > Frequency Verbatim > Flashcards

Flashcards in Frequency Verbatim Deck (37)
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1

Generalized

Present in all areas (regions)

2

Diffuse

Occurring over large areas of one or both sides of the head

3

Lateralized

Coming from one side

4

Bilateral

Coming from both sides of the head

5

Focal

Restricted to one region

6

Synchronous

Simultaneous appearing in TIME of activity over homologous head regions

7

Frequency

How often a changing signal repeats itself

8

Rhythmic

EEG activity consisting of waves of approximate constant frequency

9

Arrhythmic

No stable rhythms are present

10

Amplitude (Voltage)

Amplitude- Height of a wave measured in mm

Voltage- Electrical power of the brain measured in micro volts

11

Attenuation

Reduction of amplitude resulting from decreased voltage

12

Hypersynchrony

Unexpectedly high amplitude and regularity of rhythmic activity

13

Paroxysmal

Activity that emerges from the background with rapid onset, reaches quite high voltage and ends with an abrupt return to lower voltage activity

14

Symmetry

Approximately equal amplitude over homologous areas on opposite sides of the head

15

Morphology

The shape of the waveform

16

Monomorphic

Distinct EEG activity composed of one dominant frequency

17

Polymorphic

EEG activity composed of multiple frequencies that combine to form a complex waveform

18

Sinusoidal

EEG activity resembles sine waves

19

Transient

Isolated wave or pattern that is distinctly different from the background

20

Spikes

A potential with les than 70 milliseconds duration

21

Polyspikes

Sequence of two or more spikes

22

Sharp Waves

A potential with more than 70 milliseconds duration, but less than 200 seconds duration

23

Complex

A sequence of two or more waves with a distinct form or pattern different from the background activity

24

Biphasic (Diphasic)

A wave or complex having two distinct components; one surface positive and the other negative

25

Triphasic

Wave or complex having three distinct components: first positive, second negative and third positive, or, first negative, second positive, and third negative

26

Epileptiform

"Interpretive Term"; distinctive waves or complexes that resemble those recorded from patients with epileptic disorders

27

Quantity

Amounts of a particular type of EEG activity with respect to the percent time present and/or to voltage

28

Continuous

Occurring without interruption

29

Discontinuous

Appearing from time to time

30

Regular

Consistent form