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Phineas gauged: decision-making and the human prefrontal cortex.
Alan G Sanfey1, Reid Hastie, Mary K Colvin
1Princeton University, Princeton, NJ, USA.
Neuropsychologia
|May 20, 2003
Summary
Patients with ventromedial prefrontal cortex (VMPFC) injuries exhibit varied decision-making. Some show risk aversion, while others display risk-seeking behavior on novel gambling tasks.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Behavioral Economics
Background:
- Ventromedial prefrontal cortex (VMPFC) lesions are linked to impaired social judgment and decision-making.
- Existing decision-making tests, like the Iowa Gambling Task, yield inconsistent results for VMPFC patients.
Purpose of the Study:
- To investigate decision-making deficits in patients with VMPFC lesions using a novel gambling task.
- To examine risk-taking behaviors and decision strategies in individuals with VMPFC damage.
Main Methods:
- Participants chose between gambles with varying outcome variances.
- Behavioral performance was compared between VMPFC patients, normal controls, and older patient controls.
Main Results:
- Normal and older patient controls exhibited risk aversion, preferring low-variance gambles.
- VMPFC patients were divided: one subgroup was risk-averse, while another showed significant risk-seeking behavior, favoring high-variance gambles.
Conclusions:
- Novel decision-making tasks reveal distinct risk-seeking and risk-averse subgroups within VMPFC-lesioned patients.
- Individual differences in decision-making deficits are highlighted, offering new insights into VMPFC function.