Wiley, R. H.   2018.   Evolution of communication.   In: Shackelford, T., amd V. Weekes-Shackelford (eds.), Encyclopedia of Evolutionary Psychological Science.   Springer International Publishing, Cham.   [15 pages]  

ABSTRACT

This article summarizes developments in evolutionary biology relevant to communication in general and introduces some implications for the specific case of language. Another article, Design Features of Language, develops these implications in detail . . .

Several important insights about communication result from these calculations. First of all, adaptation by natural selection does not escape from noise . . .

Second, the variables in these calculations are completely general. They apply to signalers and receivers in all communication . . .

Third, these calculations confirm the results of all previous calculations of the evolution of mutual interactions: neither signals nor responses can spread when both are infrequent . . .

Fourth, optimization of communication in noise opens many questions about adaptations for communication in different circumstances . . .

Finally, although communication is never expected to reach perfection, honesty is expected to prevail . . .

Investigation of communication with a hypothetical absence of errors is thus unrealistic . . .

It is also clear that all communication in noise is "inferential" and "intentional."

Signals always arrive within a context of noise. A receiver decides to respond based on its current state (including memory) and the sensations it receives. These sensations include signals (usually honest but with some noise) and relevant contexts (usually correct but with some noise).

If "inferential" implies decisions by a receiver and if "intentional" implies associations for a receiver between a signal and its context, then all communication is intentional, between animals as well as humans. The decisions humans make in using language require complex criteria for responses.

The distinctive features of human linguistic communication as opposed to other forms of communication lie in the specific complexities of these cognitive criteria, not in the importance of decisions or contexts in general.

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