In this chapter we present a first survey of laboratory studies using communication. We first discuss a number of issues about the implementation of communication in the laboratory. In particular we discuss variations in the channels, the structure and the content analysis of communication. Second, we survey a number of studies in which the effects of free-form communication are compared to those with more restricted communication. We finish with a brief reference to the question why communication matters, to what the mechanisms through which communication affects behavior are.

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