From learned value to sustained bias: how reward conditioning changes attentional priority.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Decision Science

Background:

• Attentional bias towards reward-associated stimuli can persist even when detrimental to goal-directed behavior.
• A prevailing theory suggests that dopamine signaling in the striatum during reward conditioning alters neural representations in the visual cortex and parietal lobe, sustaining attentional bias post-reward.
• Limited research has investigated neural activity across both rewarded and unrewarded phases of such tasks.

Purpose of the Study:

• To investigate the neural mechanisms underlying sustained attentional bias following reward conditioning.
• To examine the relationship between striatal activity during learning and subsequent attentional biases.
• To explore how reward history influences neural activity in visual, parietal, and prefrontal cortices.

Main Methods:

• Participants underwent functional brain imaging (fMRI) during two phases: a reward-conditioning phase and a spatial cueing task.
• In the conditioning phase, specific stimuli were associated with monetary rewards.
• In the spatial cueing task, these previously rewarded stimuli served as non-predictive cues.

Main Results:

• Striatal activity during the conditioning phase predicted enhanced visual cortical and parietal activity towards conditioned stimuli during the test phase.
• Increased striatal activity correlated with decreased ventro-medial prefrontal cortex activity in response to conditioned stimuli.
• Striatal activity was also linked to anterior cingulate cortex activation when conditioned stimuli interfered with task performance.

Conclusions:

• Striatal activity during reward conditioning is a key predictor of attentional bias.
• Learning-induced alterations in visual and parietal brain activity, driven by striatal signals, mediate the sustained attentional bias.
• These findings elucidate the neural pathways through which reward history shapes attention.