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Electroencephalogram Exam Questions and Answers
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Electroencephalogram Exam Questions and Answers
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Electroencephalogram Exam Questionsand Answers
electroencephalogram ii(EEG) ii- iiAnswers ii-records iisome iiaspects iiof iithe iiactivity iiof
iithe iicontinuous iielectrical iiactivity iiof iineurons iiand iithe iicerebral iicortex
made iiby iiplacing iielectrodes iion iithe iiscalp iiand iithen iiconnecting iithe iielectrodes iito iian
iiapparatus iithat iimeasure iielectrical iipotential iidifferences iibetween iivarious iicortical
iiareas
signals iiarea iiaffected iiby iithe iistate iiof iiarousal iiof iithe iicerebral iicortex iiand iishow
iicharacteristic iichanges iiin iidifferent iistages iiof iisleep ii
signals iiare iialso iiaffected iiby iistimulation iifrom iithe iiexternal iienvironment, iiand
iibrainwaves iican iibecome iientrained iito iiexternal iistimulus
used iiin iithe iidiagnosis iiof iiepilepsies iiand iidiagnosis iiof iibrain iideath
recording iiis iidifficult iibecause iiof iithe iismall iisize iiof iivoltage iisignals iidue iito iithe
iiseparation iiof iithe iirecording iielectrodes iifrom iithe iibrains iisurface iiof iithe iiscalp, iiskull,
iiand iiCSF
reflects iithe iialgebraic iisum iiof iithe iielectrical iipotential iichanges iioccurring iifrom iilarge
iipopulations iiof iicells
brain iiwaves ii- iiAnswers ii-the iipatterns iiof iineuronal iielectrical iiactivity iirecorded iiand
iiare iigenerated iiby iisynaptic iiactivity iiat iithe iisurface iiof iithe iicortex, iirather iithan iiby
iiaction iipotentials iiin iithe iiwhite iimatter
they iiare iias iiunique iias iifingerprints
they iitend iito iihave iia iilow iiamplitude iiand iihigher iifrequency iiwhen iiawake iiand iihigh
iiamplitude iiand iilower iifrequency iiwhen iiasleep
frequencies iithat iiare iitoo iihigh iior iitoo iilow iiindicate iiproblems iiwith iicerebral iicortical
iifunctions iiand iiunconsciousness iioccurs iiat iiboth iiextremes
they iichange iiwith iiage, iisensory iistimuli, iibrain iidisease, iiand iichemical iistate iiof iithe
iibody
frequency ii- iiAnswers ii-expressed iiin iihertz ii(Hz)
number iiof iipeaks iiin iione iisecond
amplitude/intensity ii- iiAnswers ii-represented iiby iihow iihigh iithe iipeak iiwave iirises iiand
iihow iilow iithe iipeak iitrough iidips
reflects iithe iisynchronous iiactivity iiof iimany iineurons iiand iinot iithe iidegree iiof iielectrical
iiactivity iiof iiindividual iineurons
Bio iiAmplifier ii- iiAnswers ii-a iispecially iidesigned iiamplifier iiis iiessential iito iimeasure iithe
iivoltage iisignals iiof iithe iiEEG iisince iithe iisize iiof iivoltage iiis iiso iismall
, location iiof iielectrodes iiduring iiEEG iiactivity iiof iipowerlab ii2 ii- iiAnswers ii-two iifrontal
iielectrodes iion iithe iiforehead iiand iione ii(ground iior iiearth) iielectrode iiattached iito iithe
iimastoid iiprocess iito iireduce iielectrical iiinterference
epileptic iiseizure ii- iiAnswers ii-without iiwarning iia iiperson iimay iiloose iiconsciousness
iiand iifall iistiffly iito iithe iiground, iiwracked iiby iiuncontrollable iijerking
excitatory iiand iiinhibitory iipostsynaptic iipotentials ii(EPSP iiand iiIPSP) ii- iiAnswers ii-the
iiEEG iiresults iiin iislow iichanges iiin iimembrane iipotentials iiof iicortical iineurons,
iiespecially iithese, iirather iithan iiaction iipotentials iipropagated iialong iinerve iiaxons
alpha iiwaves ii- iiAnswers ii-8-13 iiHz ii
average iiamplitudes ii30-50 iimicrovolts
relatively iiregular iiand iirhythmic, iilow iiamplitude, iisynchronous iiwaves
usually iiindicate iithat iithe iibrain iiis iiidling ii(calm, iirelaxed iistate iiof iiwakefulness)
seen iiwhen iithe iieyes iiare iiclosed iiand iisubject iiis iirelaxed
strongest iiover iithe iioccipital ii(back iiof iithe iihead) iicortex iiand iialso iithe iifrontal iicortex
less iialpha iiwaves iiindicate iimore iicortical iiactivity
beta iiwaves ii- iiAnswers ii-13-30 iiHz
<20 iimicrovolts
rhythmic, iiless iiregular iiwaves iiwith iihigher iifrequencies iithan iialpha iiwaves
occur iiwhen iimentally iialert-- iiconcentrating iion iisome iiproblem iior iivisual iistimulus
awake, iialert iiindividuals iiwith iitheir iieyes iiopen
absent iior iireduced iiin iiareas iiof iicortical iidamage
can iibe iiaccentuated iiby iisedative-hypnotic iidrugs iis/a iibenzodiazepines iiand
iibarbiturates
theta iiwaves ii- iiAnswers ii-4-8 iiHz
<30 iimicrovolts
more iiirregular
common iiin iiawake iichildren ii(up iito iiadolescent iiage) iibut ii*uncommon* iiin iiawake
iiadults, iimay iiappear iiwhen iiconcentrating
normal iiduring iisleep iiat iiall iiages
low iitheta iiwaves ii- iiAnswers ii-4-5.45 iiHz
activity iithat iicorrelates iiwith iidecreased iiarousal iiand iiincreased iidrowsiness
high iitheta iiwaves ii- iiAnswers ii-6-7.45 iiHz
activity iithat iiis iiclaimed iiis iienhanced iiduring iitasks iiinvolving iiworking iimemory
delta iiwaves ii- iiAnswers ii-between ii0.5 iiand ii4 iiHz
up iito ii100-200 iimicrovolts
highest iiamplitude iiof iiany iicomponent iiEEG iiwaves
seen iiduring iisleep iiand iiwhen iithe iireticular iiactivating iisystem iiis iidamped, iis/a iiduring
iianaesthesia
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