Do everyday childhood adversities change how kids learn from rewards?
Children who had faced more ordinary adverse life events learned faster from rewards, chose more impulsively, and showed ventral striatal reward responses that partly accounted for their faster reward learning.
Source
Ventral striatal activity links adversity and reward processing in children
Study at a glance
- Design
- Cross-sectional — Two correlational studies: behavioural reward-learning and delay-discounting tasks (Study 1), then an fMRI reinforcement-learning task with region-of-interest mediation analysis (Study 2).
- N
- Study 1: 40 children aged 9 to 12. Study 2 (fMRI): 26 children after 18 were removed for head motion; 12 children took part in both.
- Population
- Typically developing children aged 9 to 12 in London, Ontario, excluding those with trauma or developmental, neurological or psychiatric disorders
- Outcome
- Model-estimated learning rates for gains and losses, delay-discounting rate, and ventral striatum and vmPFC responses to gains
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Parents rated how often and how intensely their child had experienced normative adverse events such as moving house, changing schools or losing a grandparent. In Study 1, 40 children did a probabilistic learning task (to estimate how quickly they learned from wins versus losses) and a choice task between smaller immediate and larger delayed money. In Study 2, 26 children did a points-based win/lose learning game during fMRI, and the researchers measured responses to gains and losses in the ventral striatum and ventromedial prefrontal cortex.
What they found
More adversity went with faster learning from rewards (r = 0.547) but not from losses, and with steeper discounting of delayed rewards (r = 0.35), with no age effects. In the scanner, adversity again predicted the learning rate for gains (r = 0.40) but not losses. Left ventral striatum and vmPFC responded to gains, and their gain responses predicted gain learning rates; only the left ventral striatal response partially mediated the link between adversity and reward learning.
The limits
What it doesn't show
The design is correlational, so it cannot show that adversity causes changes in the reward system; other family or genetic factors could drive both. Samples were small, 18 scanned children were dropped for motion, and the adversity questionnaire (parent-reported and not yet validated against standard measures) captures only normative events. Pubertal status was not measured, and the dopamine interpretation is inferred from fMRI rather than measured directly.
Key terms
- Ventral striatum
- A subcortical reward-system region, receiving dopamine input, that responds to rewards and reward prediction.
- Learning rate
- A parameter from a reinforcement-learning model describing how strongly each outcome updates a person's expectations.
- Delay discounting
- The tendency to value rewards less the longer one must wait for them; steeper discounting indicates more impulsive choice.
- Mediation analysis
- A statistical test of whether a third variable, here brain activity, carries part of the association between a predictor and an outcome.
- Normative adversity
- Stressful but common life events, such as moving or losing a pet, as opposed to trauma or maltreatment.
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Quiz yourself
Adversity was linked to faster learning from which outcomes?
Common questions
Why study ordinary adversity rather than trauma?
Theory suggests the developing reward system tunes itself to environmental quality even within the normal range; most previous human work looked only at severe adversity.
Does this mean moving house damages children's brains?
No. The findings are correlations in small samples and describe differences in reward sensitivity, which could be adaptive; they do not show harm or causation.
Why link these findings to dopamine when dopamine was not measured?
The learning task's gain learning rate and ventral striatal gain responses are known from drug studies to change with striatal dopamine, so they serve as indirect markers.
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