Reward
How does the striatum process reward and punishment during learning?
Open access · cc by · source: Europe PMC
Different subregions of the striatum handle unexpected feedback differently, with the front-bottom area responding to both reward and punishment, while the back-top area reacts only to unexpected reward.
How this study connects
Role on claims
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A single 'striatal reward response' collapses regions that behave differently.
Striatal subregions dissociate by what they respond to. The anterior ventral striatum was active for both unexpected rewards and unexpected punishments — a non-specific surprise response — while the posterior dorsal striatum responded only to unexpected rewards, and the amygdala showed a distinct drop specific to punishment.
Evidence for the claim as stated.
Whether these striatal signals encode value or surprise is not resolved here. Gain and loss anticipation produced comparable ventral striatal responses, and the anterior ventral striatum responded to unexpected punishment as well as unexpected reward — both consistent with a surprise account — while the posterior dorsal striatum's reward-only response is not.
Evidence for the claim as stated.
Striatal subregions exhibit highly distinct responses to feedback, with the anterior ventral striatum showing a non-specific response to general surprise, while the posterior dorsal striatum specifically tracks unexpected rewards.
Evidence for the claim as stated.
The human striatum displays regional functional dissociation, with the anterior ventral striatum responding broadly to unexpected feedback of any valence, while the posterior dorsal striatum responds specifically to unexpected rewards.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
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Whether these striatal signals encode value or surprise is not resolved here. Gain and loss anticipation produced comparable ventral striatal responses, and the anterior ventral striatum responded to unexpected punishment as well as unexpected reward — both consistent with a surprise account — while the posterior dorsal striatum's reward-only response is not.
Study at a glance
- Design
- Human experiment — fMRI reversal-learning / punishment task at the Wolfson Brain Imaging Centre
- N
- N=16 · Right-handed; mean age 26; 5 women; screened for psychiatric illness
- Population
- Healthy right-handed adults in Cambridge, UK
- Outcome
- Dissociable striatal fMRI responses to punishment during learning
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How does the striatum process reward and punishment during learning?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
16 right-handed subjects
Sixteen right-handed subjects (mean age 26; standard error 1; five female) participated in this study at the Wolfson Brain Imaging Centre (WBIC) in Cambridge, UK.
six experimental blocks
During the scan session subjects completed six experimental blocks.
Key findings
They discovered that the anterior ventral striatum became active during both unexpected rewards and unexpected punishments, showing a non-specific response to surprise. In contrast, the posterior dorsal striatum only showed increased activity during unexpected rewards. Additionally, the amygdala showed a drop in activity specifically during unexpected punishments.
Methodology
The researchers scanned 16 healthy adults using fMRI while they performed a decision task where they had to predict whether a face or scene stimulus would lead to a reward or a punishment. The rules unexpectedly reversed multiple times throughout the experiment, forcing participants to update their predictions. By analyzing brain activity during these unexpected shifts, the team mapped how different parts of the striatum responded to surprising rewards versus surprising punishments.
Limitations
Because participants could not control whether they received a reward or punishment, this study cannot show how these striatal regions behave when actions directly prevent or cause outcomes. Additionally, the small sample of 16 participants limits how well these findings generalize to broader populations. Finally, as an fMRI study, it can only show correlation between brain activity and learning, not whether these specific brain regions are causally required for reversal learning.
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