Status-dependent competition engagement via mesocortical pathway

Area of Science:

• Neuroscience
• Behavioral Biology
• Decision-Making

Background:

• Competition decisions are influenced by prior outcomes.
• The neural basis for these decisions is not fully understood.

Purpose of the Study:

• To investigate the neural mechanisms behind competition engagement decisions in mice.
• To explore the role of dopamine in translating competitive outcomes into future engagement.

Main Methods:

• Developed a 'win maze' for voluntary competition re-engagement.
• Recorded neural activity in the dorsomedial prefrontal cortex (dmPFC).
• Manipulated the ventral tegmental area (VTA) dopamine pathway and dmPFC D1 receptors.

Main Results:

• Dominant males preferred competition more than subordinate males.
• dmPFC activity showed distinct dynamics during competition.
• Winning outcomes triggered dmPFC dopamine release, linked to re-engagement.
• Inhibiting VTA^DA → dmPFC or dmPFC D1R⁺ neurons reduced re-engagement in dominant males.
• Activating VTA^DA → dmPFC enhanced engagement in subordinate males.

Conclusions:

• A status-dependent dopamine mechanism in the VTA^DA → dmPFC pathway influences competition engagement.
• This pathway translates competitive success into future behavioral decisions.