The Joint Log-Lift Task: A Social Foraging Paradigm

Area of Science:

• Animal behavior and social cognition.
• Ethology and behavioral ecology.
• Comparative psychology.

Background:

• Investigating behavioral cooperation is crucial, but current experimental tasks often lack ecological validity.
• Artificial tasks, extensive training, or lack of partner choice in existing paradigms may limit biological relevance.
• A need exists for naturalistic methods to study spontaneous cooperation.

Purpose of the Study:

• To introduce and validate the joint log-lift task, a novel social foraging paradigm.
• To test if animals spontaneously learn to cooperate in this task.
• To examine the influence of kinship and sociability on cooperative success.

Main Methods:

• The joint log-lift task was presented to juvenile domestic pigs (Sus scrofa domesticus) over 9 days in their home pens.
• The task requires obligate cooperation, where individuals must jointly lift a log for a food reward.
• Behavioral observations tracked the transition from individual to joint actions and success rates.

Main Results:

• Pigs demonstrated learning, progressively shifting from individual to joint behaviors.
• 68% of pigs spontaneously solved the task, indicating successful learning of cooperation.
• Individual success was correlated with sociability, but not with kinship, suggesting social traits are key.

Conclusions:

• The joint log-lift task is an effective, ecologically relevant tool for studying spontaneous cooperation in animals.
• Sociability, rather than kinship, plays a significant role in cooperative success.
• This paradigm facilitates large-scale experimental investigation of social foraging and partner choice.