Clever vermin? Collective intelligence in rats and roaches.

Area of Science:

• Evolutionary biology
• Animal behavior
• Collective intelligence

Background:

• Collective intelligence (CI) describes group superiority over individuals in tasks like decision-making.
• Studying CI is challenging due to diverse underlying mechanisms.
• A clear typology is needed to understand CI's requirements and evolution.

Purpose of the Study:

• To propose a typology of CI mechanisms for conceptual clarity.
• To compare CI mechanisms in rats and cockroaches as model species.
• To uncover evolutionary design principles of CI.

Main Methods:

• Developed a typology of CI mechanisms: self-organized coordination, distributed decision-making, cooperative problem-solving, statistical aggregation, and culture.
• Compared CI in rats (Rattus) and cockroaches (Blattodea) based on ecological success and social traits.
• Analyzed how disparate mechanisms can yield similar collective outcomes.

Main Results:

• The proposed typology clarifies minimum CI requirements and layered complexity.
• Cockroaches exhibit ancestral CI mechanisms lacking cognitive complexity.
• Rats display more complex social traits, including cultural learning and cooperation, alongside ancestral mechanisms.

Conclusions:

• Similar collective outcomes can arise from different CI mechanisms.
• Comparing species like rats and cockroaches aids in identifying universal CI properties versus contingent adaptations.
• This framework advances understanding of CI's evolution and design principles.