Direct and Indirect Influence of Altruistic Behavior in a Social Network.

Area of Science:

• Social psychology
• Behavioral economics
• Network science

Background:

• Prior research suggests direct social influence (recipients of generosity act more generously).
• Evidence for indirect social influence (interacting with a generosity recipient increases one's generosity) is conflicting.
• The capacity for altruistic behavior to cascade through social networks remains uncertain.

Purpose of the Study:

• To investigate the transmission range of selfish and generous behaviors in social networks.
• To explore the cognitive mechanisms underlying behavioral transmission.
• To clarify the existence and extent of direct versus indirect social influence.

Main Methods:

• Participants engaged in sequential public goods games within a controlled chain network.
• The behavior of the initial participant (first link) was experimentally set as either generous or selfish.
• The chain network structure allowed for unambiguous tracking of influence pathways.

Main Results:

• Direct social influence was confirmed, with behavior transmitted from one link to the next.
• No evidence for indirect social influence was found, suggesting altruism does not cascade through intermediaries.
• Selfish behavior demonstrated a significantly stronger influence than generous behavior.
• Expectations regarding future partners' behavior were identified as a key mediator of social influence.

Conclusions:

• Social influence in networks is primarily direct, not indirect.
• Selfishness is more contagious than generosity within these networks.
• Behavioral transmission is adaptive, driven by expectations of future interactions.