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Bilingual language control and general purpose cognitive control among individuals with bilingual aphasia: evidence based on negative priming and flanker tasks.

Dash T, Kar BR - Behav Neurol (2014)

Bottom Line: Bilingualism results in an added advantage with respect to cognitive control.The cumulative distribution function plots were used to visualize the variations in performance across conditions.The results highlight the distinction between general purpose cognitive control and bilingual language control mechanisms.

View Article: PubMed Central - PubMed

Affiliation: Centre of Behavioural and Cognitive Sciences, Senate Hall Campus, University of Allahabad, Allahabad-211002, India.

ABSTRACT

Background: Bilingualism results in an added advantage with respect to cognitive control. The interaction between bilingual language control and general purpose cognitive control systems can also be understood by studying executive control among individuals with bilingual aphasia. objectives: The current study examined the subcomponents of cognitive control in bilingual aphasia. A case study approach was used to investigate whether cognitive control and language control are two separate systems and how factors related to bilingualism interact with control processes.

Methods: Four individuals with bilingual aphasia performed a language background questionnaire, picture description task, and two experimental tasks (nonlinguistic negative priming task and linguistic and nonlinguistic versions of flanker task).

Results: A descriptive approach was used to analyse the data using reaction time and accuracy measures. The cumulative distribution function plots were used to visualize the variations in performance across conditions. The results highlight the distinction between general purpose cognitive control and bilingual language control mechanisms.

Conclusion: All participants showed predominant use of the reactive control mechanism to compensate for the limited resources system. Independent yet interactive systems for bilingual language control and general purpose cognitive control were postulated based on the experimental data derived from individuals with bilingual aphasia.

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Related in: MedlinePlus

(a–c): Reaction time data, error analysis, and CDF plot based on the performance of CR on the flanker task with nonlinguistic stimuli.
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fig5: (a–c): Reaction time data, error analysis, and CDF plot based on the performance of CR on the flanker task with nonlinguistic stimuli.

Mentions: CR's performance on the nonlinguistic flanker task showed a congruency effect (i.e., mean reaction times on the congruent trials were faster than incongruent trials) (see Figure 5(a)). Unlike the usual effects observed on flanker tasks, neutral trials were slower compared to the incongruent trials. Error analysis showed a greater number of errors on the incongruent condition compared to the congruent and neutral conditions as expected in a flanker task (see Figure 5(b)). Cumulative distribution function plots were derived and showed differences across the three conditions only in the range of the 60th to 90th percentile, which was not consistent with the mean RT performance, and showed less congruent RTs compared to neutral RTs and less neutral RTs compared to incongruent RT conditions (see Figure 5(c)). The trend of slower incongruent trials compared to congruent trials was also observed at the 5th percentile (fast trials) level.


Bilingual language control and general purpose cognitive control among individuals with bilingual aphasia: evidence based on negative priming and flanker tasks.

Dash T, Kar BR - Behav Neurol (2014)

(a–c): Reaction time data, error analysis, and CDF plot based on the performance of CR on the flanker task with nonlinguistic stimuli.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4042523&req=5

fig5: (a–c): Reaction time data, error analysis, and CDF plot based on the performance of CR on the flanker task with nonlinguistic stimuli.
Mentions: CR's performance on the nonlinguistic flanker task showed a congruency effect (i.e., mean reaction times on the congruent trials were faster than incongruent trials) (see Figure 5(a)). Unlike the usual effects observed on flanker tasks, neutral trials were slower compared to the incongruent trials. Error analysis showed a greater number of errors on the incongruent condition compared to the congruent and neutral conditions as expected in a flanker task (see Figure 5(b)). Cumulative distribution function plots were derived and showed differences across the three conditions only in the range of the 60th to 90th percentile, which was not consistent with the mean RT performance, and showed less congruent RTs compared to neutral RTs and less neutral RTs compared to incongruent RT conditions (see Figure 5(c)). The trend of slower incongruent trials compared to congruent trials was also observed at the 5th percentile (fast trials) level.

Bottom Line: Bilingualism results in an added advantage with respect to cognitive control.The cumulative distribution function plots were used to visualize the variations in performance across conditions.The results highlight the distinction between general purpose cognitive control and bilingual language control mechanisms.

View Article: PubMed Central - PubMed

Affiliation: Centre of Behavioural and Cognitive Sciences, Senate Hall Campus, University of Allahabad, Allahabad-211002, India.

ABSTRACT

Background: Bilingualism results in an added advantage with respect to cognitive control. The interaction between bilingual language control and general purpose cognitive control systems can also be understood by studying executive control among individuals with bilingual aphasia. objectives: The current study examined the subcomponents of cognitive control in bilingual aphasia. A case study approach was used to investigate whether cognitive control and language control are two separate systems and how factors related to bilingualism interact with control processes.

Methods: Four individuals with bilingual aphasia performed a language background questionnaire, picture description task, and two experimental tasks (nonlinguistic negative priming task and linguistic and nonlinguistic versions of flanker task).

Results: A descriptive approach was used to analyse the data using reaction time and accuracy measures. The cumulative distribution function plots were used to visualize the variations in performance across conditions. The results highlight the distinction between general purpose cognitive control and bilingual language control mechanisms.

Conclusion: All participants showed predominant use of the reactive control mechanism to compensate for the limited resources system. Independent yet interactive systems for bilingual language control and general purpose cognitive control were postulated based on the experimental data derived from individuals with bilingual aphasia.

Show MeSH
Related in: MedlinePlus