Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers

Tutkimuksessa on analysoitu EEG-mittauksia, jotka on tehty sanantunnistuskokeen aikana sekä dyslektisille että sujuville lukijoille. Vertaamalla herätevastepotentiaaleja (Event-Related Potential, ERP) sanoille, pseudosanoille ja muille visuaalisille herätteille on työssä saatu tuloksia, jotka näyt-...

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Main Author: Norrgrann, Ann-Marie
Other Authors: Yhteiskuntatieteellinen tiedekunta, Faculty of Social Sciences, Psykologian laitos, Department of Psychology, University of Jyväskylä, Jyväskylän yliopisto
Format: Master's thesis
Language:eng
Published: 2014
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/44133
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author Norrgrann, Ann-Marie
author2 Yhteiskuntatieteellinen tiedekunta Faculty of Social Sciences Psykologian laitos Department of Psychology University of Jyväskylä Jyväskylän yliopisto
author_facet Norrgrann, Ann-Marie Yhteiskuntatieteellinen tiedekunta Faculty of Social Sciences Psykologian laitos Department of Psychology University of Jyväskylä Jyväskylän yliopisto Norrgrann, Ann-Marie Yhteiskuntatieteellinen tiedekunta Faculty of Social Sciences Psykologian laitos Department of Psychology University of Jyväskylä Jyväskylän yliopisto
author_sort Norrgrann, Ann-Marie
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description Tutkimuksessa on analysoitu EEG-mittauksia, jotka on tehty sanantunnistuskokeen aikana sekä dyslektisille että sujuville lukijoille. Vertaamalla herätevastepotentiaaleja (Event-Related Potential, ERP) sanoille, pseudosanoille ja muille visuaalisille herätteille on työssä saatu tuloksia, jotka näyt- tävät sanantunnistusprosessin sisältävän sekä sarjallisia että rinnakkaisia piirteitä ja hahmottelevat näiden ajallista esiintymistä. Aineiston perusteella sekä kirjaimet että muut symbolit aktivoivat vi- suaalisen sananmuotoalueen (Visual Word Form Area, VWFA). Voidaan havaita, että kirjainjono tunnistetaan sanaksi prosessissa, jossa yleiset sanat tunnistetaan nopeammin kuin harvinaiset. Täl- lainen frekvenssivaikutus viittaa rinnakkaiseen sanantunnistukseen. Toisaalta ajanhetkellä, jolla sanojen tulkinta on jo pitkällä, havaitaan pseudosanoille korkeampaa aktivaatiota sarjallisen sanan- tunnistusreitin alueella. Sarjallisen sanantunnistamisen aivoalueilla havaitaan myös vähäinen ero dyslektisillä ja sujuvilla lukijoilla, mutta tämä ero saavuttaa tilastollisen merkitsevyyden vasta suh- teellisen myöhäisessä vaiheessa ja rajoittuu yhteen herätetyyppiin. Tarvittaisiin enemmän mittauk- sia, jotta dyslektisten lukijoiden sanantunnistusprosessia voitaisiin tutkia yksityiskohtaisemmin. Tutkimuksen tulosten voidaan katsoa tukevan kirjallisuudessa esitettyjä sanantunnistuksen du- aalipolkumalleja, joissa on sekä sarjallinen että rinnakkainen osa. In this work, we have analyzed the EEG recordings from a word recognition experiment undertaken by both fluent and dysfluent readers. By comparing the ERP (Event related potential) responses to words, pseudowords, and other visual stimuli we have collected evidence for both serial and parallel word recognition processes as well as their temporal activation. Characters as well as other symbols can be seen to activate the visual word form area. The sequence of characters is then recognized as a word in a process that shows a frequency effect between rare and common words, characteristic of parallel recognition. We are able to show that while semantical access would be started for common words, pseudowords show a simultaneous higher activation in a previously known serial word recognition pathway. The serial control regions also show a difference between fluent and dysfluent readers, but this difference reaches statistical significance in our data only at a relatively late time point and a single type of stimulus. More data would be needed to study the dysfluent reading process in more detail. Overall, our findings can be taken to support the dual models of serial and parallel word recognition presented in the literature.
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spellingShingle Norrgrann, Ann-Marie Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers sanantunnistus Psykologia Psychology 202 EEG dysleksia
title Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers
title_full Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers
title_fullStr Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers
title_full_unstemmed Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers
title_short Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers
title_sort analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers
title_txtP Analysis of event related potentials in a word recognition experiment with fluent and dysfluent readers
topic sanantunnistus Psykologia Psychology 202 EEG dysleksia
topic_facet 202 EEG Psychology Psykologia dysleksia sanantunnistus
url https://jyx.jyu.fi/handle/123456789/44133 http://www.urn.fi/URN:NBN:fi:jyu-201408312693
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