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Adolescents show collective intelligence which can be driven by a geometric mean rule of thumb

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Adolescents show collective intelligence which can be driven by a geometric mean rule of thumb. / Ioannou, Christos C.; Madirolas, Gabriel; Brammer, Faith S.; Rapley, Hannah A.; De Polavieja, Gonzalo G.

In: PLoS ONE, Vol. 13, No. 9, e0204462, 24.09.2018.

Research output: Contribution to journalArticle

Harvard

Ioannou, CC, Madirolas, G, Brammer, FS, Rapley, HA & De Polavieja, GG 2018, 'Adolescents show collective intelligence which can be driven by a geometric mean rule of thumb', PLoS ONE, vol. 13, no. 9, e0204462. https://doi.org/10.1371/journal.pone.0204462

APA

Ioannou, C. C., Madirolas, G., Brammer, F. S., Rapley, H. A., & De Polavieja, G. G. (2018). Adolescents show collective intelligence which can be driven by a geometric mean rule of thumb. PLoS ONE, 13(9), [e0204462]. https://doi.org/10.1371/journal.pone.0204462

Vancouver

Author

Ioannou, Christos C. ; Madirolas, Gabriel ; Brammer, Faith S. ; Rapley, Hannah A. ; De Polavieja, Gonzalo G. / Adolescents show collective intelligence which can be driven by a geometric mean rule of thumb. In: PLoS ONE. 2018 ; Vol. 13, No. 9.

Bibtex

@article{b8d41218133e41c785deaf6a736422c4,
title = "Adolescents show collective intelligence which can be driven by a geometric mean rule of thumb",
abstract = "How effective groups are in making decisions is a long-standing question in studying human and animal behaviour. Despite the limited social and cognitive abilities of younger people, skills which are often required for collective intelligence, studies of group performance have been limited to adults. Using a simple task of estimating the number of sweets in jars, we show in two experiments that adolescents at least as young as 11 years old improve their estimation accuracy after a period of group discussion, demonstrating collective intelligence. Although this effect was robust to the overall distribution of initial estimates, when the task generated positively skewed estimates, the geometric mean of initial estimates gave the best fit to the data compared to other tested aggregation rules. A geometric mean heuristic in consensus decision making is also likely to apply to adults, as it provides a robust and well-performing rule for aggregating different opinions. The geometric mean rule is likely to be based on an intuitive logarithmic-like number representation, and our study suggests that this mental number scaling may be beneficial in collective decisions.",
keywords = "Collective intelligence, Group performance, Consensus, Geometric mean, Number representation, Adolescents",
author = "Ioannou, {Christos C.} and Gabriel Madirolas and Brammer, {Faith S.} and Rapley, {Hannah A.} and {De Polavieja}, {Gonzalo G.}",
year = "2018",
month = "9",
day = "24",
doi = "10.1371/journal.pone.0204462",
language = "English",
volume = "13",
journal = "PLoS ONE",
issn = "1932-6203",
publisher = "Public Library of Science",
number = "9",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Adolescents show collective intelligence which can be driven by a geometric mean rule of thumb

AU - Ioannou, Christos C.

AU - Madirolas, Gabriel

AU - Brammer, Faith S.

AU - Rapley, Hannah A.

AU - De Polavieja, Gonzalo G.

PY - 2018/9/24

Y1 - 2018/9/24

N2 - How effective groups are in making decisions is a long-standing question in studying human and animal behaviour. Despite the limited social and cognitive abilities of younger people, skills which are often required for collective intelligence, studies of group performance have been limited to adults. Using a simple task of estimating the number of sweets in jars, we show in two experiments that adolescents at least as young as 11 years old improve their estimation accuracy after a period of group discussion, demonstrating collective intelligence. Although this effect was robust to the overall distribution of initial estimates, when the task generated positively skewed estimates, the geometric mean of initial estimates gave the best fit to the data compared to other tested aggregation rules. A geometric mean heuristic in consensus decision making is also likely to apply to adults, as it provides a robust and well-performing rule for aggregating different opinions. The geometric mean rule is likely to be based on an intuitive logarithmic-like number representation, and our study suggests that this mental number scaling may be beneficial in collective decisions.

AB - How effective groups are in making decisions is a long-standing question in studying human and animal behaviour. Despite the limited social and cognitive abilities of younger people, skills which are often required for collective intelligence, studies of group performance have been limited to adults. Using a simple task of estimating the number of sweets in jars, we show in two experiments that adolescents at least as young as 11 years old improve their estimation accuracy after a period of group discussion, demonstrating collective intelligence. Although this effect was robust to the overall distribution of initial estimates, when the task generated positively skewed estimates, the geometric mean of initial estimates gave the best fit to the data compared to other tested aggregation rules. A geometric mean heuristic in consensus decision making is also likely to apply to adults, as it provides a robust and well-performing rule for aggregating different opinions. The geometric mean rule is likely to be based on an intuitive logarithmic-like number representation, and our study suggests that this mental number scaling may be beneficial in collective decisions.

KW - Collective intelligence

KW - Group performance

KW - Consensus

KW - Geometric mean

KW - Number representation

KW - Adolescents

UR - http://www.scopus.com/inward/record.url?scp=85053802897&partnerID=8YFLogxK

U2 - 10.1371/journal.pone.0204462

DO - 10.1371/journal.pone.0204462

M3 - Article

VL - 13

JO - PLoS ONE

JF - PLoS ONE

SN - 1932-6203

IS - 9

M1 - e0204462

ER -