Anthropic Bias explores how to reason when you suspect that your evidence is biased by "observation selection effects"--that is, evidence that has been filtered by the precondition that there be some suitably positioned observer to "have" the evidence. This conundrum--sometimes alluded to as "the anthropic principle," "self-locating belief," or "indexical information"--turns out to be a surprisingly perplexing and intellectually stimulating challenge, one abounding with important implications for many areas in science and philosophy.

There are the philosophical thought experiments and paradoxes: the Doomsday Argument; Sleeping Beauty; the Presumptuous Philosopher; Adam & Eve; the Absent-Minded Driver; the Shooting Room.

And there are the applications in contemporary science: cosmology ("How many universes are there?", "Why does the universe appear fine-tuned for life?"); evolutionary theory ("How improbable was the evolution of intelligent life on our planet?"); the problem of time's arrow ("Can it be given a thermodynamic explanation?"); quantum physics ("How can the many-worlds theory be tested?"); game-theory problems with imperfect recall ("How to model them?"); even traffic analysis ("Why is the 'next lane' faster?").

Anthropic Bias argues that the same principles are at work across all these domains. And it offers a synthesis: a mathematically explicit theory of observation selection effects that attempts to meet scientific needs while steering clear of philosophical paradox.

Reviews

"From traffic analysis via a many-worlds interpretation of quantum mechanics and the problem of the fine-tuning of the universe to the purely philosophical problems of the Doomsday argument and the Sleeping Beauty problem, Bostrom succeeds in shining a new and interesting light on all of these issues." --Wouter Meijs

"Bostrom presents a highly readable and widely relevant work which can be warmly recommended to everyone in philosocience."--Christian Wuthrich, Philosophy of Science

"Probably the worst thing one can say about this book is that it is too short….Anthropic Bias is a wonderful achievement, which should find place on the shelf of every serious student of modern philosophy of science, epistemology, and cosmology." --Milan Cirkovic, Foundations of Science

"Anthropic Bias is a synthesis of some of the most interesting and important ideas to emerge from discussion of cosmic fine-tuning, the anthropic principle, and the Doomsday Argument. It deserves a place on the shelves of epistemologists and philosophers of science, as well as specialists interested in the topics just mentioned."--Neil Manson, Notre Dame Philosophical Reviews