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Related Experiment Video

Updated: Jun 22, 2026

The Collective Trust Game: An Online Group Adaptation of the Trust Game Based on the HoneyComb Paradigm

The Collective Trust Game: An Online Group Adaptation of the Trust Game Based on the HoneyComb Paradigm

Published on: October 20, 2022

Altruists are trusted based on non-verbal cues.

Ryo Oda¹, Takuya Naganawa, Shinsaku Yamauchi

¹Nagoya Institute of Technology, Nagoya 466-8555, Japan. oda.ryo@nitech.ac.jp

Biology Letters

|July 3, 2009

Summary

People can identify altruists using non-verbal cues, which helps prevent cheating in social exchanges. This study shows cognitive adaptations evolve to counter subtle deception.

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Area of Science:

Evolutionary psychology
Behavioral economics
Social cognition

Background:

Subtle cheating poses challenges in social interactions.
Previous research suggests an evolutionary basis for discriminating altruists.
Behavioral differences in social exchanges with altruists remain understudied.

Purpose of the Study:

To investigate behavioral responses to altruists versus non-altruists.
To explore the role of non-verbal cues in identifying altruists.
To provide evidence for cognitive adaptations against cheating.

Main Methods:

Utilized the Faith Game, a behavioral economic experiment.
Participants responded to videotaped individuals identified as altruists or non-altruists.
Real money was used to assess trust and social exchange behavior.

Main Results:

Participants showed a greater tendency to entrust real money to altruists compared to non-altruists.
Non-verbal cues were implicitly used to differentiate between altruists and non-altruists.
Behavioral trust patterns align with evolutionary predictions.

Conclusions:

Cognitive adaptations evolve as counter-strategies to subtle cheating.
The ability to identify altruists via non-verbal cues is evolutionarily significant.
Behavioral economics and evolutionary psychology offer insights into social decision-making.