Complementary influences of noradrenaline and dopamine in orchestrating a motivated social behavior

Noradrenaline (NA) and dopamine (DA) modulate motivated behavior, yet their contributions to social interactions are difficult to disentangle due to overlapping responses and the unstructured nature of free behavior. We address this challenge by using a natural and spontaneous maternal behavior called 'pup retrieval'. Here, we synthesize recent work demonstrating that NA and DA play complementary but temporally dissociable roles during pup retrieval. The NA released from the locus coeruleus (LC) invigorates ongoing retrieval behavior, mobilizing downstream circuits to drive goal-directed action in response to pup distress. In contrast, dopamine released from the ventral tegmental area (VTA) improves future retrieval behavior by reducing latency across trials. These findings suggest a model in which NA governs the execution of the current caregiving episode, while DA updates motivational value to optimize future maternal responses. This framework may generalize to other forms of social and affiliative behavior requiring coordination between imminent action and long-term learning.