Confidence Read from Others Movements Guides Collective Decisions
- 1University Medical Center Hamburg-Eppendorf
Abstract
A central challenge in decision-making is deciding when to trust ones own judgement and when to rely on others. Because subjective confidence correlates with objective accuracy, a sensible strategy is to follow the choice made with higher confidence. Crucially, however, this strategy depends on accessing others confidence. Here, we show that humans spontaneously read out confidence from others movements and use this information to guide collective decisions. Dyads performed a collective perceptual decision-making task. In each trial, one participant--the arbitrator--first made an individual decision by reaching toward one of two targets, then observed their partner doing the same, and finally made the collective decision on behalf of the dyad, confirming or revising their initial choice. When own confidence was low or high, arbitrators relied on simple heuristics--revising their choice when uncertain and confirming it when certain. At intermediate confidence levels, however, they extracted confidence from their partner's movement kinematics to guide revision. Computational simulations demonstrated that integrating the partners encoded confidence improved collective accuracy. Our findings highlight the importance of bodily motion for the social transmission of confidence information in collective decision-making.
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BibTeX
@misc{schmitz2026confidence,
title = {{Confidence Read from Others Movements Guides Collective Decisions}},
author = {L. Schmitz and N. Montobbio and M. Memeo and O. Sabri and B. Bahrami and A. Cavallo and S. Panzeri and C. Becchio},
howpublished = {bioRxiv},
year = {2026},
month = sep,
doi = {10.64898/2026.09.14.748905},
url = {https://www.biorxiv.org/content/10.64898/2026.09.14.748905v1},
note = {CC BY},
}
RIS
TY - UNPB
TI - Confidence Read from Others Movements Guides Collective Decisions
AU - L. Schmitz
AU - N. Montobbio
AU - M. Memeo
AU - O. Sabri
AU - B. Bahrami
AU - A. Cavallo
AU - S. Panzeri
AU - C. Becchio
PY - 2026
DA - 2026/09/14
PB - bioRxiv
DO - 10.64898/2026.09.14.748905
UR - https://www.biorxiv.org/content/10.64898/2026.09.14.748905v1
AB - A central challenge in decision-making is deciding when to trust ones own judgement and when to rely on others. Because subjective confidence correlates with objective accuracy, a sensible strategy is to follow the choice made with higher confidence. Crucially, however, this strategy depends on accessing others confidence. Here, we show that humans spontaneously read out confidence from others movements and use this information to guide collective decisions. Dyads performed a collective perceptual decision-making task. In each trial, one participant--the arbitrator--first made an individual decision by reaching toward one of two targets, then observed their partner doing the same, and finally made the collective decision on behalf of the dyad, confirming or revising their initial choice. When own confidence was low or high, arbitrators relied on simple heuristics--revising their choice when uncertain and confirming it when certain. At intermediate confidence levels, however, they extracted confidence from their partner's movement kinematics to guide revision. Computational simulations demonstrated that integrating the partners encoded confidence improved collective accuracy. Our findings highlight the importance of bodily motion for the social transmission of confidence information in collective decision-making.
ER -