Examen
Electroencephalography (EEG) Exam Questions and Answers
Electroencephalography (EEG) Exam Questions and Answers
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Publié le
23 octobre 2024
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2024/2025
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Montrer plus
Electroencephalography (EEG) Exam
Questions and Answers
What iiis iian iiEEG ii(electroencephalograph)? ii- iiAnswers ii-Electroencephalography
ii(EEG) iiis iia iimethod iiof iidetecting iineural iiactivity iiby iiplacing iielectrodes iion iithe iiscalp.
ii
EEG iirecorded iiat iithe iiscalp iiis iinon-invasive ii- iihowever, iiit iiis iialso iipossible iito iirecord
iiintra-cranial iiEEG iiby iimeasuring iiactivity iidirectly iiat iithe iiexposed iicortex. ii
EEG iiis iicheap iiand ii(relatively) iieasy iito iiconduct. ii
The iitemporal iiresolution iiof iian iiEEG iiis iigreat, iibut iithe iispatial iiresolution iiis iipoor.
What iiis iithe iiEEG iiused iifor? ii- iiAnswers ii-We iican iiuse iithe iisignals iifrom iiEEGs iito
iilearn iisomething iiabout iicognition iiwhen iipeople iiperform iitasks.
How iidoes iian iiEEG iiwork? ii- iiAnswers ii-The iielectrodes iiplaced iion iithe iiscalp iipick iiup
iismall iifluctuations iiof iielectrical iisignals, iioriginating iifrom iiactivity iiof ii(mostly iicortical)
iineurons. ii
While iithe iiraw iisignals iirecorded iiare iivery iinoisy iiand iimight iinot iilook iilike iimuch, iithey
iiare iisystematically iirelated iito iicognitive iiprocesses.
Who iiinitially iiinvented iiEEGs? ii- iiAnswers ii-Hans iiBerger iidetected iithe iifirst iiEEG
iisignal iiin ii1924 iiwith iielectrodes iiattached iito iithe iiscalp iiof iia iihuman iiand iireported iithe
iiresults iiin ii1929. ii
Berger iiinitially iistudied iimedicine iibecause iihe iiwas iiconvinced iithat iithere iiis ii"psychic
iienergy", iiwhich iimight iiallow iifor iitelepathy. ii
Berger iialso iifirst iidescribed iithe iialpha iirhythm ii- iiwhen iipeople iiclosed iitheir iieyes, iithe
iielectrical iisignal iiwas iinot iiconstant, iibut iiit iivaried iiwith iia iicharacteristic iifrequency iiof
ii8-13 iiHz. ii
Initially, iihe iiused iitwo iielectrodes, iione iiattached iito iithe iifront iiof iithe iihead iiand iione iito
iithe iirear iiand iirecorded iithe iipotential ii(i.e. iivoltage) iidifference iibetween iithem.
Describe iithe iineurophysiology iiof iian iiEEG. ii- iiAnswers ii-The iiEEG iiactivity iidoes iinot
iireflect iiaction iipotentials iibut iioriginates iimostly iifrom iipost-synaptic iipotentials ii-
iivoltages iithat iiarise iiwhen iineurotransmitters iibind iito iireceptors iion iithe iimembrane iiof
iithe iipost-synaptic iicell ii
This iicauses iiion iichannels iito iiopen iior iiclose, iileading iito iigraded iichanges iiin iithe
iipotential iiacross iithe iimembrane
This iican iibe iiunderstood iias iia iismall ii"dipole"
Signals iifrom iisingle iicells iiare iinot iistrong iienough iito iibe iirecorded iioutside iiof iithe
iihead, iibut iiif iimany iineurons iispatially iialign, iithen iitheir iisummed iipotentials iiadd iiup
iiand iicreate iithe iisignals iiwe iican iirecord