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EEG EXAM QUESTIONS WITH CORRECT ANSWERS
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EEG EXAM QUESTIONS WITH CORRECT ANSWERS
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EEG EXAM QUESTIONS WITHCORRECT ANSWERS
What iiis iian iiEEG? ii- iiAnswers ii-Measurement iiof iivoltage iifluctuations iiat iithe iisurface
iiof iithe iiscalp iigenerated iiby iithe iielectrical iiactivity iiof iithe iibrain.
These iivoltage iifluctuations iiare iicalled ii_______ iiand iiare iirecordings iiof ii___________.
ii- iiAnswers ii-Brain iiwaves
Voltage iidifference iiversus iitime
How iimany iielectrodes iiare iiplugged iiinto iieach iiamplifier iion iithe iiEEG iimachine? ii-
iiAnswers ii-Two
What iidoes iithe iiEEG iirecorder iidetect? ii- iiAnswers ii-The iivoltage iidifferences iibetween
iithe iirecording iiand iireference iielectrode iifor iieach iichannel iiof iidetection. iiThe iiamplifier
iicompares iithe iitwo iielectrode iisignals iicoming iiinto iiit iiand iicancels iiout iisignals iithat
iiare iithe iisame. iiTherefore iithe iiEEG iisignal iiis iithe iidifference iiin iielectrical iiactivity
iidetected iiby iitwo iielectrodes.
One iielectrode iipair iiis iireferred iito iias iia ii_____. ii- iiAnswers ii-Channel
Modern iiEEg iirecordings iihave iifrom ii8 iito ii40 iichannels iito iiproduce iia ii____________
iias iishown iihere. ii- iiAnswers ii-Multichannel iirecording.
The iicloser iithe iielectrodes iiare iito iieach iiother, iithe ii____ iidifferences iiin iitheir iibrain
iiwaves. ii- iiAnswers ii-Less
What iihappens iiif iithe iielectrodes iiare iitoo iiclose? ii- iiAnswers ii-The iiEEG iichannel iiwill
iidisplay iia iistraight iiline. ii
Therefore, iiwhen iirecording iiEEGs, iia iitechnician iiwill iimeasure iithe iipatient's iihead iito
iiensure iisymmetrical iiand iiequidistant iiplacement iiof iielectrodes.
The iivoltage iiemitted iifrom iithe iiscalp iiis iion iithe iiorder iiof ii____ ii- iiAnswers ii-Microvolts
ii(10^-6)
The iiEEG iiamplifiers iiincrease iithis iisignal iiby iia iifactor iiof.... ii- iiAnswers ii-Several
iihundred iithousands ii(10^5) iifor iidetection iiand iirecording.
What iiis iithe iidigitized iidata iianalyzed iiby? ii- iiAnswers ii-Fourier iitransforms ii(FT) iiand
iifiltering.
, What iiis iiFT? ii- iiAnswers ii-A iimathematical iiway iito iiconvert iithe iiwave iidata iifrom iibeing
iia iifunction iiwhere iivoltage iivaries iiwith iitime iito iia iidescription iiof iihow iimuch iiof iithe
iiEEG iisignal ii(called iipower) iion iiany iigiven iichannel iioccurs iiat iia iigiven iifrequency.
What iiare iithe iithree iiaspects iiof iiEEGs? ii- iiAnswers ii-1. iiBrain iiwaves iioccurring iiat
iidifferent iifrequencies
2. iiA iinumber iiof iispecific iitypes iiof iiwave iipatterns
3. iiArtifacts
What iiare iiartifacts? ii- iiAnswers ii-Disturbances iicaused iiby iitechnical iidefects, iiusually
iitransitory, iiand iiinclude: iielectrode iimovement, iiwith iiloss iiof iicontact; iimuscle iiactivity
iiobscuring iithe iiEEg, iimovements iiof iithe iihead, iiscratching iithe iiscalp; iiand iisweating. ii
Figure ii2 iiillustrates iieye iimovement iiartifacts iiin iithe iimultichannel iiEEG iirecording.
What iiare iibrain iiwaves? ii- iiAnswers ii-Listed iifrom iihighest iito iilowest iifrequency ii(alpha,
iibeta, iitheta, iidelta).
The iivarious iibrain iiwaves iiare iiassociated iiwith iiglobal iiaspects iiof iiawareness iiand
iisubjectivity iias iilisted iibelow.
Frequency iiof iigamma iiwaves ii- iiAnswers ii-> ii40 iiHz
Description iiof iigamma iiwaves. ii- iiAnswers ii-Widely iispread iiout iibrain iiareas iithat iiare
iiactive iiat iithe iisame iitime iidisplay iigamma iioscillations.
Gamma iifrequencies iiare iithought iito iireflect iiwhat iiis iicalled iiBINDING. iiThis iiis iithe
iiproperty iiof iithe iibrain iithat iiunifies iiour iiawareness iiinto iia iisingle iigestalt.
Not iivisible iiin iithe iiEEG iitracing, iimust iibe iiextracted iiby iifourier iianalysis.
Frequency iiof iibeta iiwaves ii- iiAnswers ii-13-20 iiHz
Description iiof iibeta iiwaves. ii- iiAnswers ii-Usually iiseen iion iiboth iisides iiin iisymmetrical
iidistribution iiand iiis iimost iievident iifrontally.
Low iiamplitude, iihigh iifrequency iiof iiwaves.
May iibe iiabsent iior iireduced iiin iiareas iiof iicortical iidamage.
It iiis iithe iidominant iirhythm iiin iipatients iiwho iiare iialert iior iianxious iior iiwho iihave iitheir
iieyes iiopen.
Frequency iiof iialpha iiwaves? ii- iiAnswers ii-8-13 iiHz
Description iiof iialpha iiwaves. ii- iiAnswers ii-Alpha iiis iiusually iibest iiseen iiin iithe iiposterior
iiregions iiof iithe iihead iion iieach iiside, iibeing iihigher iiin iiamplitude iion iithe iidominant
iiside.
It iiis iibrought iiout iiby iiclosing iithe iieyes iiand iiby iirelaxation, iiand iiabolished iiby iieye
iiopening iior iialtering iiby iiany iimechanism ii(thinking, iicalculating).
It iiis iithe iimajor iirhythm iiseen iiin iinormal iirelaxed iiadults-it iiis iipresent iiduring iimost iiof
iilife iiespecially iibeyond iithe iithirteenth iiyear iiwhen iiit iidominates iithe iiresting iitracing.
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