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[{"key": "dc.contributor.advisor", "value": "Taskinen, Sara", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Miettinen, Jari", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Hakala, Karita", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2018-01-29T15:56:09Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2018-01-29T15:56:09Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2018", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1818678", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/56942", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Sokean signaalinerottelun menetelm\u00e4t ovat k\u00e4ytt\u00f6kelpoisia magnetoenkefalografilla mitattujen aivomagneettik\u00e4yrien analysoinnissa. Sokean signaalinerottelun menetelmien avulla voidaan selvitt\u00e4\u00e4, mist\u00e4 aivoaktivaatio on per\u00e4isin ja millaisiin toimintoihin aktivaatio voidaan yhdist\u00e4\u00e4. MEG-aineiston ajallinen tarkkuus on hyv\u00e4, joten lyhytkin mittausaika tuottaa hyvin suuren aineiston.\n\nSuuren aineiston tuottamat laskennalliset ongelmat voidaan kiert\u00e4\u00e4 ikkunoimalla MEG-aineisto aika- tai tilasuunnassa. Aineiston ikkunointia on sovellettu aiemmissa tutkimuksissa toiminnallisen magneettikuvauksen aineistoon, jolloin ikkunointi on tehty aikasuunnassa. T\u00e4ss\u00e4 tutkielmassa ikkunointia sovellettiin MEG-aineistoon tilasuunnassa, jolloin kaikkien MEG-sensorien yht\u00e4aikaisen analysoinnin sijaan k\u00e4ytet\u00e4\u00e4n vain osaa sensoreista kerrallaan. T\u00e4ll\u00f6in moniulotteiseen MEG-aineistoon voidaan k\u00e4ytt\u00e4\u00e4 sokean signaalinerottelun menetelmi\u00e4 pienemmiss\u00e4 osioissa ja MEG-aineistosta voidaan l\u00f6yt\u00e4\u00e4 vaikeasti erotettavissa olevia, pieniamplitudisia l\u00e4hdesignaaleja.\n\nSpatiaalisen ikkunoinnin hy\u00f6dyllisyytt\u00e4 tutkittiin simulointiasetelman ja MEG-aineiston avulla. Simulointiasetelmassa pyrittiin selvitt\u00e4m\u00e4\u00e4n, onko ikkunointimenetelm\u00e4st\u00e4 hy\u00f6ty\u00e4 sokean signaalinerottelun menetelmi\u00e4 sovellettaessa. Simulointi toteutettiin MEG-mittausasetelmaa mukaillen. MEG-aineisto koostui yhden koehenkil\u00f6n noin nelj\u00e4n minuutin MEG-mittauksesta, jossa tarkoituksena oli kontrolloida koehenkil\u00f6n n\u00e4k\u00f6j\u00e4rjestelm\u00e4n toimintaa.\n\nSimulointiasetelman tulosten perusteella spatiaalisesta ikkunoinnista on hy\u00f6ty\u00e4 sokean signaalinerottelun menetelmist\u00e4 erityisesti riippumattomien komponenttien analyysin (ICA) k\u00e4yt\u00f6n yhteydess\u00e4, eik\u00e4 ikkunoinnista ole ainakaan haittaa toisen asteen l\u00e4hde-erottelumallin (SOS) k\u00e4yt\u00f6n yhteydess\u00e4. MEG-aineiston tapauksessa ikkunointi ei her\u00e4tevasteiden tasolla pystynyt erottelemaan haluttua l\u00e4hdesignaalia tarkasti, mutta l\u00e4hdesignaaleiden topografiat vastasivat oletetunlaisia l\u00e4hdesignaalien jakaumia.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Karita Hakala (kakehaka) on 2018-01-29 15:56:08.028632. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2018-01-29T15:56:09Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201801291369.pdf: 7999547 bytes, checksum: 42c3206a23e778d4c7eeee99a8d08bf8 (MD5)\nlicense.html: 4866 bytes, checksum: 9e032bfbcbb7bee438047b6b9dfc6ca3 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2018-01-29T15:56:09Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201801291369.pdf: 7999547 bytes, checksum: 42c3206a23e778d4c7eeee99a8d08bf8 (MD5)\nlicense.html: 4866 bytes, checksum: 9e032bfbcbb7bee438047b6b9dfc6ca3 (MD5)\n Previous issue date: 2018", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (53 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "sokea signaalinerottelu (BSS)", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "riippumattomien komponenttien analyysi (ICA)", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "toisen asteen l\u00e4hde-erottelumallit (SOS)", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Spatiaalisen ikkunoinnin ja sokean signaalinerottelun menetelmien hy\u00f6dynt\u00e4minen MEG-aineiston analysoinnissa", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201801291369", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": 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