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Volition and conflict in human medial frontal cortex
Parashkev Nachev1, Geraint Rees, Andrew Parton
1Department of Visual Neuroscience, Imperial College London, St Dunstan's Road, London W6 8RP, United Kingdom.
Current Biology : CB
|January 26, 2005
Summary
This study reveals a functional division within the human medial frontal cortex, separating areas responsible for action initiation (volition) from those involved in conflict monitoring. The supplementary eye field (SEF) helps resolve conflicting action plans.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- The medial frontal cortex's role in action control is debated.
- Damage here causes deficits in spontaneous action initiation (volitional deficits).
- Previous research links medial frontal cortex to conflict monitoring and voluntary action control.
Purpose of the Study:
- To elucidate the precise neural mechanisms of volitional deficits.
- To investigate the functional relationship between conflict monitoring and voluntary action control.
- To functionally subdivide the pre-supplementary motor area (pre-SMA).
Main Methods:
- Utilized a novel behavioral paradigm.
- Employed functional imaging of the oculomotor system.
- Investigated activity in the supplementary eye field (SEF).
Main Results:
- Demonstrated a functional subdivision of the pre-SMA into distinct areas for volition and conflict.
- Showed SEF activity differentiates success/failure in changing action plans during conflict.
- Identified specific neural substrates for action initiation and conflict resolution.
Conclusions:
- Propose a functional architecture of the medial frontal cortex.
- Highlight distinct roles for pre-SMA subregions in action generation and conflict resolution.
- Suggest the SEF plays a key role in resolving conflicting actions.