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Kamin Kim1, Joshua Carp, Kate D Fitzgerald
1Department of Psychology, University of Michigan, Ann Arbor, Michigan, United States of America. kaminkim@umich.edu
Plos One
|April 25, 2013
Summary
The conflict monitoring model accurately predicts brain activity in youth. Reaction time (RT) reliably predicts posterior medial frontal cortex (pMFC) activity, confirming the model
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Developmental Psychology
Background:
- The conflict monitoring model posits reaction time (RT) as a key indicator of response conflict.
- This model predicts posterior medial frontal cortex (pMFC) activity correlates with RT.
- Previous studies in adults support this, but findings in youth were inconclusive.
Purpose of the Study:
- To validate the conflict monitoring model's predictions in healthy youth.
- To investigate the relationship between RT and pMFC activity in a larger youth sample.
- To clarify discrepancies from previous studies on youth cognition.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to record brain activity.
- A large group of healthy youth (n=28) performed the multi-source interference task (MSIT).
- RT and pMFC activity were analyzed in relation to task conditions and trial-by-trial variability.
Main Results:
- Both predictions of the conflict monitoring model were confirmed in the youth sample.
- pMFC activity was greater in slow-RT trials than fast-RT trials.
- RT-matched trials from congruent and incongruent conditions showed equivalent pMFC activity.
Conclusions:
- The conflict monitoring model accurately describes the relationship between pMFC activity and RT in healthy youth.
- The findings suggest the model's applicability across different age groups.
- Further research is needed to explore potential contributions of non-conflict-related processes.
