Dopamine Signaling

Dopamine signaling refers to the process by which dopamine is released by one neuron, crosses the synapse, binds to receptors on neighboring cells, and transmits information. These signals help the brain reinforce learning, sustain motivation, update expectations, and organize behavior around important outcomes. Dopamine signaling contributes to processes such as reward anticipation, reinforcement learning, movement, attention, and decision-making. After dopamine is released, transporter proteins — including DAT1 (dopamine transporter) — help clear dopamine from the synapse so the system can reset. Experiences and substances can alter dopamine signaling over time, changing how strongly the brain responds to rewards and motivation-related cues. In conditions such as ADHD and bipolar disorder (BD), difficulties may involve regulation of dopamine signaling rather than simply too much or too little dopamine. Also see Reward Prediction Error and Striatum.