Last updated: December 9, 2017

Collective Intelligence 

"Psychologists have repeatedly shown that a single statistical factor — often called “general intelligence”—emerges from the correlations among people’s performance on a wide variety of cognitive tasks. But no one has systematically examined whether a similar kind of “collective intelligence” exists for groups of people. In two studies with 699 people, working in groups of two to five, we find converging evidence of a general collective intelligence factor that explains a group’s performance on a wide variety of tasks. This “c factor” is not strongly correlated with the average or maximum individual intelligence of group members but is correlated with the average social sensitivity of group members, the equality in distribution of conversational turn-taking, and the proportion of females in the group." (Woolley et al., 2010, Science, p686)

Woolley et al 2010 Science Collective IQ

This is the personal website of Marinus H. van IJzendoorn with information about his work on the social, psychological and neurobiological determinants of parenting and child development, with special emphasis on attachment, emotion regulation, differential susceptibility, and child maltreatment.

His research was part of PEARL --Program for Emotion regulation and Attachment Research in Leiden, the research program of the Centre for Child and Family Studies at Leiden University, the Netherlands. PEARL has been dissolved by the end of 2017, after decades of productive collaborative work. Alan Sroufe evaluated PEARL in June 2016 as follows: "This is an extraordinary program. The team is highly productive, and the cutting edge research being carried out is of the highest quality."

At Leiden University he is currently involved in several research programs, among others the Leiden Consortium for Individual Development (L-CID), 3G Family Lab, and Father Trials.
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At Erasmus University Rotterdam he is professor of human development in the Department of Psychology, Education, and Child Studies (DPECS) (See website), and one of the co-leaders of Generation R (See website).

From October 1, 2017 to October 1, 2020 he is the Wellcome Trust Visiting Professor in the Primary Care Unit of the School of Clinical Medicine, University of Cambridge
(See website).

Visiting Scholar at Sidney Sussex College
'Dieu me Garde de Calomnie' (Lady Frances Sidney, Countess of Sussex,1531–1589)