A neuronal signature for monogamous reunion

Area of Science:

• Neuroscience
• Behavioral Biology
• Animal Behavior

Background:

• Pair-bond formation is crucial for social behavior and relies on neuromodulatory signaling.
• The nucleus accumbens is implicated in pair bonding, but its specific neuronal dynamics are not well understood.

Purpose of the Study:

• To investigate the neuronal dynamics within the nucleus accumbens during pair-bond formation in prairie voles.
• To identify specific neuronal ensembles involved in partner-approach and novel-vole approach behaviors.

Main Methods:

• Utilized 1-photon in vivo calcium (Ca2+) imaging in monogamous prairie voles.
• Monitored neuronal activity in the nucleus accumbens during interactions with partners and novel individuals.

Main Results:

• Pair bonding did not alter overall nucleus accumbens Ca2+ activity.
• Distinct, non-overlapping neuronal ensembles were recruited for partner-approach versus novel-vole approach.
• The partner-approach ensemble size increased post-bond formation and predicted bond strength.
• Departure ensembles showed no change and did not correlate with bond strength, indicating approach-specific plasticity.

Conclusions:

• Neuronal ensemble plasticity in the nucleus accumbens, specifically for partner approach, is a key substrate for pair-bond formation and maturation.
• The expansion of the partner-approach ensemble is a critical feature associated with developing social bonds.