Last updated: February 20, 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)

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 is part of PEARL –Program for Emotion regulation and Attachment Research in Leiden, which is the research program of the Centre for Child and Family Studies at Leiden University, the Netherlands. See website.
At Erasmus University Rotterdam he is professor of human development and one of the co-leaders of Generation R (See website).