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[{"key": "dc.contributor.advisor", "value": "Kujala, Jan", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Aaltonen, Aino", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Hassel, Helena", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2021-06-03T10:32:38Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2021-06-03T10:32:38Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2021", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/76190", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Ty\u00f6muistin toiminta jaetaan tallennus-, yll\u00e4pito- ja mieleenpalautusvaiheeseen. Ty\u00f6muistin vaiheita on tutkittu neuraalisella tasolla tarkastelemalla niihin kytkeytyvi\u00e4 oskillaatioita, mutta k\u00e4sitys eri oskillaatioiden roolista ty\u00f6muistiprosesseissa on viel\u00e4 osin ep\u00e4selv\u00e4. T\u00e4m\u00e4n tutkimuksen tarkoituksena oli tarkastella ty\u00f6muistin tallennus- ja yll\u00e4pitovaiheeseen sek\u00e4 h\u00e4iri\u00f6\u00e4rsykkeen inhibointiin liittyvi\u00e4 oskillaatioita vertaamalla onnistuneiden ja ep\u00e4onnistuneiden suoritusten aikaista aivotoimintaa visuaalisen ty\u00f6muistiteht\u00e4v\u00e4n aikana. Tutkimus toteutettiin osana WM-InhibitionMEG -projektia. Tutkimukseen osallistui 10 koehenkil\u00f6\u00e4, jotka olivat i\u00e4lt\u00e4\u00e4n 19\u201328-vuotiaita. Koeasetelmana k\u00e4ytettiin kasvokuvista muodostuvia sarjoja, jotka sis\u00e4lsiv\u00e4t tallennuskuvan, h\u00e4iri\u00f6kuvan ja kohdekuvan. Koehenkil\u00f6n teht\u00e4v\u00e4n\u00e4 oli verrata kohdekuvaa aiemmin esitettyyn tallennuskuvaan ja ilmoittaa nappia painamalla, olivatko kuvat samat. Mittaukset suoritettiin magnetoenkefalografialla, ja aineisto analysoitiin aika-taajuusanalyysimenetelm\u00e4ll\u00e4. Tutkimuksessa havaittiin eroavaisuuksia onnistuneiden ja ep\u00e4onnistuneiden suoritusten v\u00e4lill\u00e4. Theta-alfataajuuskaistalla havaittiin pienemp\u00e4\u00e4 voimakkuutta onnistuneissa suorituksissa ty\u00f6muistin yll\u00e4pitovaiheessa ennen h\u00e4iri\u00f6kuvan esitt\u00e4mist\u00e4 vasemman ohimo- ja takaraivolohkon alueella. Heti h\u00e4iri\u00f6kuvan esitt\u00e4misen p\u00e4\u00e4ttymisen j\u00e4lkeen havaittiin todenn\u00e4k\u00f6isesti inhibitioon liittyv\u00e4\u00e4 suurempaa voimakkuutta onnistuneissa suorituksissa alfa-taajuuskaistalla vasemman otsalohkon alueella. Lis\u00e4ksi yll\u00e4pidon loppuvaiheessa havaittiin pienemp\u00e4\u00e4 voimakkuutta onnistuneissa suorituksissa beta-taajuuskaistalla oikean ohimo- ja takaraivolohkon alueella. Tulosten perusteella voidaan todeta, ett\u00e4 onnistuneissa ja ep\u00e4onnistuneissa suorituksissa on eroavaisuuksia, jotka ovat l\u00f6ydett\u00e4viss\u00e4 aivojen oskillatorisesta toiminnasta. Jatkotutkimuksen my\u00f6t\u00e4 oskillaatioiden toistaiseksi ep\u00e4selvist\u00e4 rooleista ty\u00f6muistin toiminnassa voidaan saada lis\u00e4\u00e4 tietoa.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Working memory can be divided into three phases: encoding, maintenance, and retrieval. These phases have been studied on a neural level by observing the related oscillations. However, the roles of different oscillations in working memory processes remain partly unclear. The aim of this study was to examine oscillations related to encoding and maintenance and the inhibition of a distractor by comparing the brain activity during successful and unsuccessful trials during a visual working memory task. The study was conducted as a part of the WM-Inhibition-MEG project. Ten participants, aged 19-28, took part in the experiment. The experimental paradigm consisted of trials with facial images, and each trial consisted of three images: an encoder, a distractor, and a target image. The participants\u2019 task was to compare the target image to the previously shown encoder image and indicate with a button press whether the images were the same or different. The measurements were recorded using magnetoencephalography and the data was analysed using time-frequency analysis method. We observed differences between successful and unsuccessful trials. There was less power in theta-alpha frequency band within the left temporal and occipital lobes during successful trials during maintenance before distractor stimulus. Immediately after the distractor stimulus we observed greater alpha power in the left frontal lobe during successful trials. This was most likely related to inhibition. In addition, we observed less beta band power in the right temporal and occipital lobes during successful trials. The results indicate that there are differences between successful and unsuccessful trials which can be observed within the oscillatory functions of the brain. This research serves as a starting point for more extensive research on the role of neural oscillations in successful working memory functions.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2021-06-03T10:32:38Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2021-06-03T10:32:38Z (GMT). No. of bitstreams: 0\n Previous issue date: 2021", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "32", "language": "", "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": "ty\u00f6muistin vaiheet", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "visuaalinen ty\u00f6muisti", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "oskillaatiot", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Aivojen rytmisen toiminnan erot onnistuneissa ja ep\u00e4onnistuneissa ty\u00f6muistiprosesseissa visuaalisen ty\u00f6muistiteht\u00e4v\u00e4n aikana", "language": "", "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-202106033417", "language": "", "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": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Kasvatustieteiden ja psykologian tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Education and Psychology", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Psykologian laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Psychology", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Psykologia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Psychology", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "202", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ty\u00f6muisti", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "MEG", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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