Recently, Adami and coworkers have been able to measure the information content of digital organisms living in their Avida artificial life system. They slow that over time, the organisms behave like Maxwell's demon, accreting information (or complexity) as they evolve. In Avida the organisms don't interact with each other, merely reproduce at a particular rate (their fitnes), and attempt to evaluate an externally given arithmetic function in order win bonus fitness points. Measuring the information content of a digital organism is essentially a process of counting the number of genotypes that give rise to the same phenotype.
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