In ordertoimplementanEEG-basedbraincomputerinterface(BCI),averylargenumberofstrategies (ranging fromsensory–motor,p300,auditorybased,visuallybased)canbeused.However,notechnique existswhichisbasedontheolfactorystimulationor,better,basedontheimaginationofolfactory stimuli. The presentpaperdescribesaninnovativeparadigm,thatisthevoluntarybrainactivationwiththe disgust producedbyrememberingunpleasantodors,andasimpleandrobustclassification methodon which asingletrialbinaryBCIcanbeimplemented.Inordertoclassifythesignal,mainlythechannels P4, C4,T8andP8havebeenused,byspanningthefrequencybandbetween32and42Hz,thatisa subset ofthegammabandexternaltothebandsusuallyoccupiedbyothertasks(theintervalbetween 1 and30Hz),andthealphabandbetween8and12Hz. Right hemisphereofthebrainandgammabandoffrequenciesareparticularlysensitivewhen experiencingnegativeemotions,suchasthedisgustproducedbysmellingorrememberingunpleasant odors, whilethealphabandisusuallymodified withconcentration.Thisconstitutesanadvantageforthe proposed classification techniquebecauseitismadeintrinsicallyeasybythelocalizationintoparticular positions andfrequencies:differentfeaturesaremostlybasedondifferentfrequencybands. The choiceofdisgustproducedbyrememberingunpleasantodorsistwofold:smellingisanancestral sensation whichissostrongthatitsEEGsignalisproducedalsoinpersonsaffectedbyhyposmiawhen they imagineanolfactorysituation;itcanbeusedwithoutexternalstimulation,thatistheusercan decide freelywhenandifactivateit. The proposedmethodandtheexperimentalsetuparedescribedandaseriesofexperimental measurements arepresentedanddiscussed.Theaccuracyoftheproposedmethodisalsoevaluatedand the reachedlevelsareabout90%.Theproposedsystemcanbeausefulcommunicationalternativefor disabled peoplethatcannotuseotherBCIparadigms.
Basis for the implementation of an EEG-based single-trial binary brain computer interface through the disgust produced by remembering unpleasant odors / Giuseppe Placidi;Danilo Avola;Andrea Petracca;Fiorella Sgallari;Matteo Spezialetti. - In: NEUROCOMPUTING. - ISSN 0925-2312. - STAMPA. - 160:(2015), pp. 308-318. [10.1016/j.neucom.2015.02.034]
Basis for the implementation of an EEG-based single-trial binary brain computer interface through the disgust produced by remembering unpleasant odors
SGALLARI, FIORELLA;
2015
Abstract
In ordertoimplementanEEG-basedbraincomputerinterface(BCI),averylargenumberofstrategies (ranging fromsensory–motor,p300,auditorybased,visuallybased)canbeused.However,notechnique existswhichisbasedontheolfactorystimulationor,better,basedontheimaginationofolfactory stimuli. The presentpaperdescribesaninnovativeparadigm,thatisthevoluntarybrainactivationwiththe disgust producedbyrememberingunpleasantodors,andasimpleandrobustclassification methodon which asingletrialbinaryBCIcanbeimplemented.Inordertoclassifythesignal,mainlythechannels P4, C4,T8andP8havebeenused,byspanningthefrequencybandbetween32and42Hz,thatisa subset ofthegammabandexternaltothebandsusuallyoccupiedbyothertasks(theintervalbetween 1 and30Hz),andthealphabandbetween8and12Hz. Right hemisphereofthebrainandgammabandoffrequenciesareparticularlysensitivewhen experiencingnegativeemotions,suchasthedisgustproducedbysmellingorrememberingunpleasant odors, whilethealphabandisusuallymodified withconcentration.Thisconstitutesanadvantageforthe proposed classification techniquebecauseitismadeintrinsicallyeasybythelocalizationintoparticular positions andfrequencies:differentfeaturesaremostlybasedondifferentfrequencybands. The choiceofdisgustproducedbyrememberingunpleasantodorsistwofold:smellingisanancestral sensation whichissostrongthatitsEEGsignalisproducedalsoinpersonsaffectedbyhyposmiawhen they imagineanolfactorysituation;itcanbeusedwithoutexternalstimulation,thatistheusercan decide freelywhenandifactivateit. The proposedmethodandtheexperimentalsetuparedescribedandaseriesofexperimental measurements arepresentedanddiscussed.Theaccuracyoftheproposedmethodisalsoevaluatedand the reachedlevelsareabout90%.Theproposedsystemcanbeausefulcommunicationalternativefor disabled peoplethatcannotuseotherBCIparadigms.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
