A behavioural and functional imaging investigation of Stroop task performance in late proficient bilinguals

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dc.contributor.advisor Dr. Karen Waldie en
dc.contributor.advisor Dr. Ian Kirk en
dc.contributor.author Badzakova-Trajkov, Gjurgjica en
dc.date.accessioned 2009-02-03T01:20:31Z en
dc.date.available 2009-02-03T01:20:31Z en
dc.date.issued 2008 en
dc.identifier.citation Thesis (PhD--Psychology)--University of Auckland, 2008. en
dc.identifier.uri http://hdl.handle.net/2292/3365 en
dc.description.abstract In this thesis, Stroop task performance was investigated (using behavioural, electrophysiological and functional magnetic resonance imaging (fMRI) techniques) in late and proficient adult bilinguals currently living in the second language (L2) environment. Monolingual participants, matched for age and handedness, were recruited as controls. The Stroop colour-word task was considered an appropriate tool to test the general hypothesis that bilingualism might influence executive or cognitive control processes. In Study One, a dual-task paradigm was used for assessing the lateralisation of language functions (given the linguistic nature of the Stroop paradigm used here) in the bilinguals (Macedonian-English/M-E). Bilinguals showed a more bilateral hemispheric involvement, for both languages, compared to monolinguals. These findings also provided supporting evidence for the hypothesis of greater right-hemispheric involvement for language in bilinguals. In Study Two, two behavioural Stroop task paradigms (manual and verbal) were used in order to assess the magnitude of the Stroop effect between the groups. Bilinguals (M-E, German-English/G-E) showed a trend of smaller interference scores across both languages compared to monolinguals. In Study Three, manual Stroop task performance with concurrent electroencephalograph (EEG) recording revealed that bilinguals had temporal shifts in the N400 component (of about 30-40 ms) for the interference comparison for both languages compared to monolinguals. Also, relative to monolinguals, M-E bilinguals (for both L1 and L2) and G-E bilinguals (for L2) had fewer electrodes over frontal and central sites with a significant amplitude difference in the interference comparison (i.e., a reduced interference effect). In Study Four, the neural substrates engaged during Stroop task performance were investigated using fMRI. In general, monolinguals showed greater activation in regions such as the prefrontal cortex and anterior cingulate (regions associated with good executive control). This suggested that relative to bilinguals, monolinguals require more neural resources to accomplish conflict resolution. Taken together, Stroop task performance in late and proficient bilinguals currently living in the L2 environment differed from that of monolinguals across all methods of investigation. It appears that cognitive processing changes at the executive level can be observed as a result of bilingualism. The results also provide some evidence for changes in L1 processing following late L2 acquisition, as similar results across both languages and tasks were observed for the M-E bilinguals. It is also possible that slight modifications to cerebral laterality as a result of the late learning of (and continuous exposure to) a second language could contribute to these differences in executive functioning. The language environment might therefore be a major factor in the lateralisation of language processing and executive functioning in bilinguals. These conclusions, though tentative and require further investigation, have important implications for language and executive processing in general and for theories regarding cognitive flexibility in bilinguals. en
dc.description.sponsorship Auckland University Doctoral Scholarship en
dc.language.iso en en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA1867038 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject bilingualism en
dc.subject Stroop en
dc.subject fMRI en
dc.subject EEG en
dc.subject interference en
dc.subject language en
dc.subject behavioural en
dc.subject laterality en
dc.subject executive en
dc.subject control en
dc.title A behavioural and functional imaging investigation of Stroop task performance in late proficient bilinguals en
dc.type Thesis en
thesis.degree.discipline Psychology en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Doctoral en
thesis.degree.name PhD en
dc.subject.marsden Fields of Research::380000 Behavioural and Cognitive Sciences::380100 Psychology::380102 Learning, memory, cognition and language en
dc.rights.holder Copyright: The author en
pubs.local.anzsrc 17 - Psychology and Cognitive Sciences en
pubs.org-id Faculty of Science en

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