Patterns: Descriptive Terminology Flashcards
the number of times a wave occurs in one second
Frequency
frequency is expressed in…
Hz
Beta
> 13Hz
Alpha
8-13Hz
Theta
4-7Hz
Delta
<4Hz
activity with waves of same frequency or constant duration
rhythmic
activity of differing frequencies
arrhythmic
the length of time the wave lasts
duration
what is duration calculated in?
milliseconds or seconds
The faster the frequency the ___
shorter the duration
The slower the frequency the ___
longer the duration
the strength of the electrical activity in the brain
Voltage
what is voltage expressed in?
microvolts (uV)
amplitude reduction
attenuation
abrupt beginning and abrupt ending of the activity distant from the background in frequency, morphology, and amplitude
paroxysmal
the shape of waves or waveforms
morphology
activity that comes and goes
transient
20-70 msec
14-50 Hz
spike
70-200 msec
5-14 Hz
Sharp
having 2 components
Biphasic wave
having 3 components
Triphasic wave
waves sharply contoured standing out from the background having the same shape characteristics of wave indicative of epilepsy
Epileptiform
activity of one frequency or waves similar in duration
monomorphic
activity of more than one frequency
polymorphic
two or more waves different frequencies that stand out from the background
complex
activity restricted to one or a few electrodes
focal
activity predominantly on one side of the head
lateralized
activity occurs at the same time all over the head
generalized
activity that is similar in frequency, voltage, and morphology from both hemispheres
symmetry
activity that is similar in frequency, voltage, and morphology from homologous head regions
synchrony
approximately the same interval between discharges
periodic
reaction to stimulation
reactivity
