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This paper develops the concepts and methods of a process we will call "alignment of computational models" or "docking" for short. Alignment is needed to determine whether two models can produce the same results, which in turn is the basis for critical experiments and for tests of whether one model can subsume another. We illustrate our concepts and methods(More)
SFI Working Papers contain accounts of scientific work of the author(s) and do not necessarily represent the views of the Santa Fe Institute. We accept papers intended for publication in peer-reviewed journals or proceedings volumes, but not papers that have already appeared in print. Except for papers by our external faculty, papers must be based on work(More)
We analyze the role of social structure in maintaining cooperation within a population of adaptive agents for whom cooperative behavior may be costly in the short run. We use the example of a collection of agents playing pairwise Prisoner's Dilemma. We call sustained cooperative behavior in such circumstances a 'cooperative regime'. We show that social(More)
We examined whether interpersonal closeness increases salivary progesterone. One hundred and sixty female college students (80 dyads) were randomly assigned to participate in either a closeness task with a partner versus a neutral task with a partner. Those exposed to the closeness induction had higher levels of progesterone relative to those exposed to the(More)
Transfer of a normal Chinese hamster X chromosome (carried in a mouse A9 donor cell line) to a nickel-transformed Chinese hamster cell line with an Xq chromosome deletion resulted in senescense of these previously immortal cells. At early passages of the A9/CX donor cells, the hamster X chromosome was highly active, inducing senescence in 100% of the(More)
W e analyze organizational regeneration using case materials from a study of a children's summer camp. Each year members of various types of seasonal organizations, such as summer camps and ski areas, come together to bring these organizations " back to life " after many months of dormancy. Because many staff members are new and other conditions vary, the(More)