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[{"key": "dc.contributor.advisor", "value": "Parviainen, Tiina", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Westerholm, Saara", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2019-01-04T10:16:30Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2019-01-04T10:16:30Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2018", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/60903", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Ik\u00e4\u00e4ntyminen heikent\u00e4\u00e4 ihmisen ty\u00f6muistin kyky\u00e4 torjua erilaisia h\u00e4iri\u00f6tekij\u00f6it\u00e4. Alfa-aktiivisuuden (noin 10 Hz) tiedet\u00e4\u00e4n heijastavan lepoa tai inhibitiota ihmisen aivoissa. Kognitiivisessa prosessoinnissa alfan tiedet\u00e4\u00e4n reflektoivan esimerkiksi h\u00e4iri\u00f6tekij\u00f6iden ehk\u00e4isemist\u00e4 prosessin aikana. Aivojen visuaalisten alueiden tiedet\u00e4\u00e4n sijaitsevan takaraivon aivokuorella. T\u00e4ss\u00e4 tutkielmassa halusin selvitt\u00e4\u00e4, miten visuaalinen inhibitio eroaa helppojen ja vaikeiden visuaalisten h\u00e4iri\u00f6kuvien v\u00e4lill\u00e4. Halusin my\u00f6s selvitt\u00e4\u00e4 korreloivatko h\u00e4iri\u00f6naikainen visuaalisen aivokuoren alfa-aktiivisuus ja visuaalisessa ty\u00f6muistiteht\u00e4v\u00e4ss\u00e4 p\u00e4rj\u00e4\u00e4minen toistensa kanssa. Hypoteeseina esitin, ett\u00e4 helpot ja vaikeat visuaaliset h\u00e4iri\u00f6tekij\u00e4t aikaansaavat erilaiset alfa-vasteet ja ett\u00e4 voimakkaampi h\u00e4iri\u00f6naikainen alfa-aktiivisuus korreloi paremman ty\u00f6muistisuorituksen kanssa. T\u00e4ss\u00e4 tutkimuksessa k\u00e4ytettiin visuaalista ty\u00f6muistiteht\u00e4v\u00e4\u00e4 visuaalisen h\u00e4iri\u00f6tekij\u00e4n kanssa. K\u00e4yt\u00f6ss\u00e4 oli sek\u00e4 helppoja ett\u00e4 vaikeita visuaalisia h\u00e4iri\u00f6kuvia. Alfa-aktiivisuus takaraivon alueella mitattiin kahdeltakymmenelt\u00e4kahdeksalta koehenkil\u00f6lt\u00e4 k\u00e4ytt\u00e4en magnetoenkefalografiaa. Koehenkil\u00f6t olivat syntyneet vuosina 1935-1946. Tulokset paljastavat, ett\u00e4 helppojen ja vaikeiden visuaalisten h\u00e4iri\u00f6iden aikainen alfa-aktiivisuus poikkeavat toisistaan. Helppo h\u00e4iri\u00f6kuva aiheuttaa aivoissa erilaisen alfa-aktiivisuuden modulaation kuin vaikea h\u00e4iri\u00f6kuva. Sen sijaan visuaalista ty\u00f6muistia mittaavassa teht\u00e4v\u00e4ss\u00e4 p\u00e4rj\u00e4\u00e4misess\u00e4 ei havaittu eroja sen mukaan, kuinka voimakas alfaaktiivisuus takaraivon aivokuorella oli h\u00e4iri\u00f6kuvien aikana. \r\n \r\nAvainsanat: ty\u00f6muisti, visuaalinen aivokuori, alfa-aktiivisuus, ik\u00e4\u00e4ntyminen, MEG, visuaalinen h\u00e4iri\u00f6", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Aging declines ability to inhibit different distractions during working memory process. Alpha activity (10 Hz) is generally known to reflect rest or inhibition in human brain. In cognitive processing alpha oscillations reflect for example distractor inhibition. Brains visual areas are known to locate in occipital cortex. In this thesis I want to solve how visual inhibition differs between easy and difficult visual distractor pictures. I want also solve whether occipital alpha activity during distraction and visual working memory task performance correlate. My hypothesis is that easy and difficult distractor pictures lead to different occipital alpha activity states and that higher occipital alpha activity during distraction picture predict better performance in visual working memory task. \r\nIn this study we used visual working memory task with visual distractor. There was both easy and difficult distractor pictures. Alpha power in occipital cortex during working memory task was measured from 28 older adults born between years 1935 and 1946 using magnetoencephalography. The results reveal that there is difference between occipital alpha activity during either easy or difficult distractor pictures. Easy distractor picture leads to different modulation of occipital alpha than difficult distractor picture. Instead of that there wasn\u00b4t correlation between occipital alpha activity during distraction and visual working memory task performance. \r\n \r\n \r\nKeywords: working memory, occipital cortex, alpha-activity, aging, MEG, visual distraction", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2019-01-04T10:16:30Z\r\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2019-01-04T10:16:30Z (GMT). No. of bitstreams: 0\r\n Previous issue date: 2019", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "29", "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": "eng", "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": "visuaalinen aivokuori", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "alfa-aktiivisuus", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "visuaalinen h\u00e4iri\u00f6", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Inhibiting visual distractor during visual working memory task : effect of visual distractor difficulty to occipital alpha activity", "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-201901041072", "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": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "MEG", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "aivot", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ik\u00e4\u00e4ntyminen", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "n\u00e4k\u00f6muisti", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "working memory", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "MEG", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "brain", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ageing", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "visual memory", "language": "", "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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