Cholinergic-dopaminergic synergy and antagonism shape prediction-error broadcasting

In mice performing psychometric learning, cholinergic and dopaminergic populations interact to shape reward prediction-error broadcasting, showing synergy for reward and antagonism for punishment-linked dopamine suppression.

• Why it matters: Reinforcement learning depends on prediction-error signals, but the circuit-level rules governing how basal forebrain cholinergic and midbrain dopaminergic populations coordinate remain unclear.
• What they did: The team simultaneously monitored both systems with dual-cell-type optogenetic tagging plus neurotransmitter measurements, then used optogenetic stimulation and channelrhodopsin-assisted mapping to identify a cholinergic-to-dopaminergic disynaptic inhibitory route.
• The result: Chemogenetic cholinergic suppression reduced dopaminergic responses to reward-predicting stimuli, weakened punishment-induced dopamine suppression, and impaired learning, implying circuit architecture can flexibly tune prediction-error signaling.

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