Feedback that confirms reward expectation triggers auditory cortex activity.

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• Associative learning involves reward anticipation influencing sensory processing, modulated by dopamine.
• The role of dopamine in sensory cortex activation during reward delivery remains less understood.

Purpose of the Study:

• Investigate neural activity in sensory cortices at reward outcome.
• Determine if dopamine (L-DOPA) modulates neural responses during reward reception.
• Examine the impact of expectation confirmation on auditory cortex activation.

Main Methods:

• Appetitive instrumental learning task with frequency-modulated tones predicting monetary reward.
• Functional magnetic resonance imaging (fMRI) to analyze neural activity.
• Comparison of neural responses under conditions of expected/received reward, expected/unreceived reward, and unexpected/unreceived reward.

Main Results:

• Auditory cortex activity increased during feedback when an expected reward was received or when no reward was expected and none was received.
• Differential auditory cortex activation was observed only in participants who learned the association.
• Dopaminergic modulation (L-DOPA) did not influence this expectation-based auditory cortex response.

Conclusions:

• Auditory cortices are active at the time of reward outcome, reflecting expectation confirmation rather than reward receipt itself.
• This finding highlights the role of predictive coding in sensory cortex function during learning.
• Dopamine's role may be more prominent during reward anticipation than during outcome evaluation in this context.