Dopamine release-associated striatal blood oxygenation and whole-brain dynamics during associative learning.

Dopamine release in the nucleus accumbens predicts widespread brain activity changes during associative learning, with a gradual shift in blood oxygenation responses across multiple regions.

• Why it matters: Understanding how dopaminergic signaling influences brain-wide hemodynamics is crucial for decoding reward-based learning mechanisms and their neural basis, which remains poorly characterized.
• What they did: Using concurrent fMRI and dopamine photometry in awake mice, the study tracked dopamine release and blood oxygenation, revealing a temporal shift in responses that correlates with learning stages and extends across a broad neural network.
• The result: Dopamine transients closely match local BOLD signals, and removing dopaminergic signals eliminates reward-related BOLD modulation, highlighting dopamine's central role in orchestrating brain activity during learning.