This study used a virtual environment in which study participants worked in specifically designed groups to solve a problem . . . In the "fully connected" group, everyone's work was completely accessible to everyone else -- much like a tight-knit family or small town. In the "locally connected" group, participants primarily were aware of what their neighbors, or the people on either side, were doing. In the "small world" group, participants also were primarily aware of what their neighbors were doing, but they also had a few distant connections that let them send or retrieve good ideas from outside of their neighborhood.
Goldstone found that the fully connected groups performed the best when solving simple problems. Small world groups, however, performed better on more difficult problems. For these problems, the truism "The more information, the better" is not valid.