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Does the medial orbitofrontal cortex have a role in social valuation?
M P Noonan1, J Sallet, P H Rudebeck
1Department of Experimental Psychology, University of Oxford, South Parks Road, OX1 3UD, UK. maryann.noonan@psy.ox.ac.uk
The European Journal of Neuroscience
|June 17, 2010
Summary
Investigating the ventromedial prefrontal cortex (vmPFC), this study found that medial orbitofrontal cortex (mOFC) lesions do not alter social valuation. However, mOFC lesions caused mild decision-making impairments, suggesting distinct vmPFC subregions mediate these functions.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Primate Studies
Background:
- Ventromedial prefrontal cortex (vmPFC) lesions are associated with social behavior changes.
- Human vmPFC lesions often affect multiple regions, including medial orbitofrontal cortex (mOFC) and anterior cingulate cortex (ACCg).
- The precise roles of distinct vmPFC subregions in social valuation and decision-making remain unclear.
Purpose of the Study:
- To investigate the specific role of the medial orbitofrontal cortex (mOFC) in social valuation and decision-making.
- To differentiate the functions of mOFC from anterior cingulate gyrus (ACCg) within the vmPFC.
Main Methods:
- Focal mOFC lesions were induced in four macaque monkeys.
- Behavioral assessments were conducted before and after lesion induction.
- Performance was evaluated on tasks measuring social valuation and probabilistic decision-making.
Main Results:
- Lesions confined to the mOFC did not alter social valuation.
- mOFC lesions resulted in mild impairments in a probabilistic two-choice decision task.
- Anterior cingulate gyrus (ACCg) lesions did not affect social valuation or decision-making in this study.
Conclusions:
- A double dissociation suggests distinct vmPFC subregions mediate social valuation and decision-making.
- Medial orbitofrontal cortex (mOFC) appears critical for decision-making, while ACCg may be more involved in social valuation.
- These findings refine our understanding of vmPFC functional organization.
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