Neural correlates of conflict processing
- 530 Downloads
In this study we examined the neural correlates of conflict processing in the Stroop, counting, and digit-location tasks using event-related brain potentials (ERPs). The behavioral data revealed robust interference in response time and accuracy for all tasks. The interference effect for response time was greater in the Stroop task than the other tasks; in contrast, the interference effect for response accuracy was greater in the counting tasks than the other tasks. The N450 and sustained potential (SP) were elicited in each task. Partial least-squares (PLS) analysis was used to examine the structural relationships between the ERPs, task design, and behavior. TaskPLS analysis revealed that the N450 and SP were associated with a single latent variable leading to the suggestion that a common set of neural generators was recruited during conflict processing across the tasks and that there were differences between ERPs related to early processing across the three tasks. BehavioralPLS analysis revealed that the amplitude of the SP was positively correlated with response time and accuracy, indicating that this modulation of the ERPs may be related to response selection rather than to conflict resolution.
KeywordsConflict processing Stroop task Counting task Partial least-squares ERPs
This work was supported by a grant from the Faculty Research Program of The University of Notre Dame. We would like to thank Nancy Lobaugh for invaluable discussion related to the analysis and interpretation of the results of PLS analyses. Robert West, 118 Haggar Hall, University of Notre Dame, Notre Dame, IN 46556, USA. Email West.email@example.com.
- Dien J, Frishkoff GA (2004) Principal components analysis of event-related potential datasets. In: Handy T (ed) Event-related potentials: A methods handbook. MIT Press, Cambridge, Mass, pp 189–208Google Scholar
- Eriksen BA, Eriksen CE (1974) Effects of noise letters upon the identification of a target letter in a nonsearch task. Percept Psychophys 16:143–149Google Scholar
- Hentschel U (1973) Two new interference tests compared to the Stroop color-word test. Psychol Res Bull, Lund Univ 13:1–24 (From Psychological Abstracts, 1974, 51, Abstract No. 8163)Google Scholar
- Salthouse TA, Meinz EJ (1995) Aging, inhibition, working memory, and speed. J Gerontol B Psychol Sci Soc Sci 50B:297–306Google Scholar
- Wold H (1975) Path models with latent variables: The NIPALS approach. In: Blalock HM, Aganbegian A, Borodkin FM, Boudon R, Cappecchi V (eds) Quantitative sociology: International perspectives on mathematical and statistical modeling. Academic Press, NY, USA, pp 307–357Google Scholar