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Two networks involved in producing and realizing plans.
Cristiano Crescentini1, Shima Seyed-Allaei, Antonino Vallesi
1Cognitive Neuroscience Sector, International School for Advanced Studies (SISSA), Trieste, Italy. crescent@sissa.it
Neuropsychologia
|March 22, 2012
Summary
The dorsolateral prefrontal cortex (DLPFC) is crucial for planning complex tasks. This study shows DLPFC activation during initial planning, not execution, suggesting its role in abstract sequence generation.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- The dorsolateral prefrontal cortex (DLPFC) is implicated in planning.
- Its specific role in planning versus working memory and timing (initial planning vs. execution) is unclear.
Purpose of the Study:
- To investigate the specific role of the DLPFC in the planning phase versus the execution phase of complex tasks.
- To differentiate DLPFC involvement in abstract planning from working memory demands.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to compare brain activation patterns.
- Participants performed the Tower of Hanoi task (planning and execution) and a sequence memorization task.
Main Results:
- The DLPFC showed preferential activation during the initial planning phase of the Tower of Hanoi task.
- Plan execution engaged posterior temporal, inferior frontal, and dorsolateral premotor cortex.
- Memorizing sequences activated different regions than initial planning.
Conclusions:
- DLPFC activation is associated with the generation and evaluation of abstract response sequences during planning.
- Plan execution relies on distinct neural networks involved in rehearsing and enacting planned actions.
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