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Related Experiment Video

Updated: Jun 9, 2026

Inter-Brain Synchrony in Open-Ended Collaborative Learning: An fNIRS-Hyperscanning Study
04:44

Inter-Brain Synchrony in Open-Ended Collaborative Learning: An fNIRS-Hyperscanning Study

Published on: July 21, 2021

Optimally interacting minds.

Bahador Bahrami1, Karsten Olsen, Peter E Latham

  • 1University College London Institute of Cognitive Neuroscience, University College London, Alexandra House, 17 Queen Square, London WC1N 3AR, UK. bbahrami@gmail.com

Science (New York, N.Y.)
|August 28, 2010
PubMed
Summary
This summary is machine-generated.

Two heads are better than one for collective decision-making when individuals have similar sensitivities and can communicate freely. However, differing sensitivities can impair group performance, as explained by a Bayesian confidence model.

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Area of Science:

  • Cognitive Science
  • Social Psychology
  • Human Perception

Background:

  • Human collaboration is crucial for species survival and problem-solving.
  • The adage 'two heads are better than one' is widely accepted but lacks empirical validation in low-level decision tasks.
  • Understanding group dynamics in decision-making is key to optimizing collective intelligence.

Purpose of the Study:

  • To investigate whether two observers are indeed better than one in a perceptual decision-making task.
  • To determine the conditions under which group decision-making outperforms individual decision-making.
  • To model the factors influencing collective performance in perceptual tasks.

Main Methods:

  • A collective low-level perceptual decision-making task was designed.
  • Two observers with varying degrees of visual sensitivity participated.
  • Free communication between observers was permitted, without outcome feedback.

Main Results:

  • When observers had similar visual sensitivities, group performance was superior to individual performance.
  • When observers had disparate visual sensitivities, group performance was inferior to the best individual's performance.
  • A Bayesian model accurately predicted these outcomes based on communicated confidence levels.

Conclusions:

  • Collective decision-making benefits are contingent on the similarity of individual abilities and effective communication.
  • Free communication enhances group performance when individuals possess comparable expertise.
  • Group decision-making efficacy can be modeled using Bayesian principles of confidence sharing.