Electroencephalography Exam
Questions and Answers
Electroencephalography: iiInvasive iior iinon iiinvasive? ii- iiAnswers ii-- iinon-invasive
iimeasure iiof iibrain iiactivity
- iiCompletely iisafe iiand iipainless iiprocedure
Electroencephalography:
Measures ii(3)? ii- iiAnswers ii-1) iielectrical iiactivity iiof iibrain iiprovides iia iiunique iiinsight
iihow iithe iibrain iireacts iito iiexternal iistimuli
2) iiReveals iichanges iiin iibrain iistate iiassociated iiwith iidiffering iilevels iiof iiarousal iior
iiunder iidifferent iiexperimental iiconditions
3) iiReveals iichronology iiof iimental iiprocesses.
- iiEg: iiAuditory iistimuli, iimemory, iitarget iidetection ii(when iiyou iimiss iiit iiwhen iiyou iidont)
Electroencephalography: iiResolution ii(2)? ii- iiAnswers ii-1) iiExcellent iitemporal
iiresolution
2) iiPoor iispatial iiresolution
Electroencephalography: iiRecords? ii- iiAnswers ii-record iipotential iidifferences ii(micro-
volts)
Electroencephalography: iiInstruments? ii- iiAnswers ii-array iiof iisurface iielectrodes iion
iithe iiscalp
Electroencephalography: iiUsually iiused iifor? ii- iiAnswers ii-- iiMuch iipsychological
iiresearch iiis iibased iion iimeasuring iithe iispeed iiand iiaccuracy iiof iiparticipants'
iiresponses ii- ii(i.e. iireaction iitime iitests).
Electroencephalography: iiWhat iidoes iiit iirecord? ii- iiAnswers ii-EEG iican iishow iiwhat
iihappens iiin iithe iibrain iibefore, iiduring iiand iiafter iia iiresponse iibutton iiis iipressed.
ii(reporting iicontinously, iileading iiup iito, iiduring, iiafter) ii(brain iiresponse iithen
iibehavioural iiresponse, iisee iiwhat iibrain iidoes iiafter iiresponse)
How iidoes iian iiElectroencephalography iiwork? ii- iiAnswers ii-- iiThe iibrain iiis iialways
iiactive, iiwhether iiawake iior iisleeping... iior iieven iiwhile iiunder iianesthesia...
- iibrain iicells iicommunicate iiby iipassing iielectrical iiimpulses iiback iiand iiforth. iiThe
iipurpose iiof iiEEG iiis iito iimeasure iithe iielectrical iiactivity iiresulting iifrom iithe iiinteractions
iibetween iineurons
Electrodes:
, Measures?
Instrument? ii- iiAnswers ii--key iito iimeasuring iithese iielectrical iicharges
-flat, iimetal iidiscs iiwhich iiare iiattached iito iithe iiscalp iiand iian iiEEG iicaps iihave iimultiple
iielectrodes
So iihow iimany iielectrodes iishould iiyour iiEEG iicap iihave?
also iiavailable iiwith ii32, ii64, ii128 iielectrodes iifor?
Systems iiavailable iiwith ii4, ii10 iior ii24 iichannels ii(3)? ii- iiAnswers ii--EEG iicaps iiwith ii10-
20 iielectrodes iishould iibe iiadequate iifor iimost iiacademic iineeds iibut iidepends iion iithe
iiresearch iiyour iidoing ii
- iialso iiavailable iiwith ii32, ii64, ii128 iielectrodes iifor iimore iiadvanced iiimaging iistudies
- iiSystems iiavailable iiwith ii4, ii10 iior ii24 iichannels. iiThese iiinclude iian iiadditional iiECG
ii(heart iiactivity), iiEMG ii(muscle iiactivity) iior iiEOG ii(eye iimovement) iichannel.
What iiabout iielectrode iiplacement ii(2)? ii- iiAnswers ii-1) iiThe iicap iimust iiallow iielectrodes
iito iibe iipositioned iiprecisely... iiplaced iiaccording iito iiinternational iistandards.
2) iiMake iisure iito iichoose iian iiEEG iicap iithat iiis iisized iiaccurately. iiEEG iiheadsets
iishould iicome iiwith iia iivariety iiof iisizing iioptions iiand iibe iieasily iiadjusted.
What iiabout iithe iiamplifier? ii- iiAnswers ii-Signal iiquality iiis iiof iivital iiimportance iiwhen iiit
iicomes iito iiEEG. iiThe iiinitial iiEEG iisignal iiis iicomprised iiof iilow iifrequency iifluctuations
iiwhich iineed iito iibe iiamplified. iiAs iia iiresult, iithe iiamplifier iiis iioften iithe iimost iiexpensive
iiand iidefining iifeature iiof iian iiEEG iiheadset. iiIf iithere iiis iione iithing iito iicheck, iimake
iisure iiit's iithat iithe iiamplifier iiis iiof iithe iihighest iiquality.
Should iiI iiuse iiwet iior iidry iielectrodes? ii- iiAnswers ii-- ii"Wet iielectrodes" iiuse iia
iiconductive iigel iito iiimprove iisignal iiquality iiwhile ii"Dry iiElectrodes" iido iinot iirequire
iisuch iigel.
- iiThe iigel iiused iican iibe iisticky iiand iiunpleasant iifor iiparticipants. iiFor iithis iireason
iimany iiof iithose iiwishing iito iiuse iiEEG iifor iimarket iiresearch iipurposes iiopt iifor iidry
iielectrodes iiin iiorder iito iiimprove iiparticipation iiand iicompliance. iiThis iiis
iiunderstandable; iithe iilast iithing iiyou iiwant iiis iithe iiparticipant iihaving iia iinegative
iiexperience
Which iielectrodes iiprovide iibetter iisignal iiquality? iiWhy? ii- iiAnswers ii-- iiAlthough iimany
iimodern iidry iielectrodes iiprovide iiexcellent iisignal iiquality, iiwet iielectrodes iiprovide
iibetter iicontact iibetween iielectrode iiand iiscalp, iiimproving iidata iiquality
- iiAn iiexcellent iicompromise iicomes iiin iithe iiform iiof iiheadsets iithat iiuse iicleaner iiand
iimore iicomfortable iisaline iibased iiwet iisensors. iiThese iiprovide iiboth iicomfort iiand
iiquality. iiNewer, iicleaner iielectrode iicreams iiare iialso iiavailable.
Wired iivs iiWireless iielectrodes? ii- iiAnswers ii-In iiorder iifor iiEEG iitechnology iito iibecome
iimore iiuser-friendly, iimany iiEEG iisystems iihave iimoved iifrom iithe iibulky iisystems iiused
iiin iiclinical iisettings iito iisleek, iiconvenient iiwireless iisystems. iiThis iiis iiallowing iithem iito
iibe iiused iiin iia iirange iiof iinew iisettings. iiIf iiyour iiresearch iiquestion iirequires iisimulation
Questions and Answers
Electroencephalography: iiInvasive iior iinon iiinvasive? ii- iiAnswers ii-- iinon-invasive
iimeasure iiof iibrain iiactivity
- iiCompletely iisafe iiand iipainless iiprocedure
Electroencephalography:
Measures ii(3)? ii- iiAnswers ii-1) iielectrical iiactivity iiof iibrain iiprovides iia iiunique iiinsight
iihow iithe iibrain iireacts iito iiexternal iistimuli
2) iiReveals iichanges iiin iibrain iistate iiassociated iiwith iidiffering iilevels iiof iiarousal iior
iiunder iidifferent iiexperimental iiconditions
3) iiReveals iichronology iiof iimental iiprocesses.
- iiEg: iiAuditory iistimuli, iimemory, iitarget iidetection ii(when iiyou iimiss iiit iiwhen iiyou iidont)
Electroencephalography: iiResolution ii(2)? ii- iiAnswers ii-1) iiExcellent iitemporal
iiresolution
2) iiPoor iispatial iiresolution
Electroencephalography: iiRecords? ii- iiAnswers ii-record iipotential iidifferences ii(micro-
volts)
Electroencephalography: iiInstruments? ii- iiAnswers ii-array iiof iisurface iielectrodes iion
iithe iiscalp
Electroencephalography: iiUsually iiused iifor? ii- iiAnswers ii-- iiMuch iipsychological
iiresearch iiis iibased iion iimeasuring iithe iispeed iiand iiaccuracy iiof iiparticipants'
iiresponses ii- ii(i.e. iireaction iitime iitests).
Electroencephalography: iiWhat iidoes iiit iirecord? ii- iiAnswers ii-EEG iican iishow iiwhat
iihappens iiin iithe iibrain iibefore, iiduring iiand iiafter iia iiresponse iibutton iiis iipressed.
ii(reporting iicontinously, iileading iiup iito, iiduring, iiafter) ii(brain iiresponse iithen
iibehavioural iiresponse, iisee iiwhat iibrain iidoes iiafter iiresponse)
How iidoes iian iiElectroencephalography iiwork? ii- iiAnswers ii-- iiThe iibrain iiis iialways
iiactive, iiwhether iiawake iior iisleeping... iior iieven iiwhile iiunder iianesthesia...
- iibrain iicells iicommunicate iiby iipassing iielectrical iiimpulses iiback iiand iiforth. iiThe
iipurpose iiof iiEEG iiis iito iimeasure iithe iielectrical iiactivity iiresulting iifrom iithe iiinteractions
iibetween iineurons
Electrodes:
, Measures?
Instrument? ii- iiAnswers ii--key iito iimeasuring iithese iielectrical iicharges
-flat, iimetal iidiscs iiwhich iiare iiattached iito iithe iiscalp iiand iian iiEEG iicaps iihave iimultiple
iielectrodes
So iihow iimany iielectrodes iishould iiyour iiEEG iicap iihave?
also iiavailable iiwith ii32, ii64, ii128 iielectrodes iifor?
Systems iiavailable iiwith ii4, ii10 iior ii24 iichannels ii(3)? ii- iiAnswers ii--EEG iicaps iiwith ii10-
20 iielectrodes iishould iibe iiadequate iifor iimost iiacademic iineeds iibut iidepends iion iithe
iiresearch iiyour iidoing ii
- iialso iiavailable iiwith ii32, ii64, ii128 iielectrodes iifor iimore iiadvanced iiimaging iistudies
- iiSystems iiavailable iiwith ii4, ii10 iior ii24 iichannels. iiThese iiinclude iian iiadditional iiECG
ii(heart iiactivity), iiEMG ii(muscle iiactivity) iior iiEOG ii(eye iimovement) iichannel.
What iiabout iielectrode iiplacement ii(2)? ii- iiAnswers ii-1) iiThe iicap iimust iiallow iielectrodes
iito iibe iipositioned iiprecisely... iiplaced iiaccording iito iiinternational iistandards.
2) iiMake iisure iito iichoose iian iiEEG iicap iithat iiis iisized iiaccurately. iiEEG iiheadsets
iishould iicome iiwith iia iivariety iiof iisizing iioptions iiand iibe iieasily iiadjusted.
What iiabout iithe iiamplifier? ii- iiAnswers ii-Signal iiquality iiis iiof iivital iiimportance iiwhen iiit
iicomes iito iiEEG. iiThe iiinitial iiEEG iisignal iiis iicomprised iiof iilow iifrequency iifluctuations
iiwhich iineed iito iibe iiamplified. iiAs iia iiresult, iithe iiamplifier iiis iioften iithe iimost iiexpensive
iiand iidefining iifeature iiof iian iiEEG iiheadset. iiIf iithere iiis iione iithing iito iicheck, iimake
iisure iiit's iithat iithe iiamplifier iiis iiof iithe iihighest iiquality.
Should iiI iiuse iiwet iior iidry iielectrodes? ii- iiAnswers ii-- ii"Wet iielectrodes" iiuse iia
iiconductive iigel iito iiimprove iisignal iiquality iiwhile ii"Dry iiElectrodes" iido iinot iirequire
iisuch iigel.
- iiThe iigel iiused iican iibe iisticky iiand iiunpleasant iifor iiparticipants. iiFor iithis iireason
iimany iiof iithose iiwishing iito iiuse iiEEG iifor iimarket iiresearch iipurposes iiopt iifor iidry
iielectrodes iiin iiorder iito iiimprove iiparticipation iiand iicompliance. iiThis iiis
iiunderstandable; iithe iilast iithing iiyou iiwant iiis iithe iiparticipant iihaving iia iinegative
iiexperience
Which iielectrodes iiprovide iibetter iisignal iiquality? iiWhy? ii- iiAnswers ii-- iiAlthough iimany
iimodern iidry iielectrodes iiprovide iiexcellent iisignal iiquality, iiwet iielectrodes iiprovide
iibetter iicontact iibetween iielectrode iiand iiscalp, iiimproving iidata iiquality
- iiAn iiexcellent iicompromise iicomes iiin iithe iiform iiof iiheadsets iithat iiuse iicleaner iiand
iimore iicomfortable iisaline iibased iiwet iisensors. iiThese iiprovide iiboth iicomfort iiand
iiquality. iiNewer, iicleaner iielectrode iicreams iiare iialso iiavailable.
Wired iivs iiWireless iielectrodes? ii- iiAnswers ii-In iiorder iifor iiEEG iitechnology iito iibecome
iimore iiuser-friendly, iimany iiEEG iisystems iihave iimoved iifrom iithe iibulky iisystems iiused
iiin iiclinical iisettings iito iisleek, iiconvenient iiwireless iisystems. iiThis iiis iiallowing iithem iito
iibe iiused iiin iia iirange iiof iinew iisettings. iiIf iiyour iiresearch iiquestion iirequires iisimulation
