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Peter Hammerstein

Peter Hammerstein is Professor in Organismic Evolution at the Institute for Theoretical Biology at Humboldt University, Berlin and an external member of the interdisciplinary Santa Fe Institute.

Titles by This Editor

How do we make decisions? Conventional decision theory tells us only which behavioral choices we ought to make if we follow certain axioms. In real life, however, our choices are governed by cognitive mechanisms shaped over evolutionary time through the process of natural selection. Evolution has created strong biases in how and when we process information, and it is these evolved cognitive building blocks—from signal detection and memory to individual and social learning—that provide the foundation for our choices.

Current thinking in evolutionary biology holds that competition among individuals is the key to understanding natural selection. When competition exists, it is obvious that conflict arises; the emergence of cooperation, however, is less straightforward and calls for in-depth analysis. Much research is now focused on defining and expanding the evolutionary models of cooperation. Understanding the mechanisms of cooperation has relevance for fields other than biology.