Introduction

Collective intelligence refers to collective behavior that is stably correlated with ecologically meaningful features of the environment, salient for the survival of the collective, adaptive to changes in the environment, and that transcends the capability of any single member of the collective. Social insect colonies provide an ideal subject for study because they comprise a large number of individuals that can be easily maintained in laboratory environments and are readily reproduced, thus providing an opportunity for the replication of statistically robust experiments. The American myrmecologist W. M. Wheeler was the first to propose the idea of the social insect colony as an organism in its own right, having the ability to regulate both its behavior and its environment to fulfill particular salient needs. The colony is able to do all of this in the absence of a central authority through the interactions among and activities of its individual members, none of whom possesses the cognitive and physical abilities to carry out these tasks on its own. The social insect colony provides the prototypical example of a collective intelligence.