Robert W. Boyd

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Recent investigations have uncovered large, consistent deviations from the predictions of the textbook representation of Homo economicus (Alvin E. Roth et al., 1991; Ernst Fehr and Simon Gächter, 2000; Colin Camerer, 2001). One problem appears to lie in economists’ canonical assumption that individuals are entirely self-interested: in addition to their own(More)
chone use of an “abundant” resource. Yukon Tourism Occasional Papers in Archaeology 3. o s w a l t , w e n d e l l h . 1963. Mission of change in Alaska. San Marino: Huntington Library. ———. 1990. Bashful no longer: An Alaskan Eskimo ethnohistory, 1778–1998. Norman: University of Oklahoma Press. o s w a l t , w e n d e l l h . , a n d j a m e s w. v a n s t(More)
Formal models of cultural evolution analyze how cognitive processes combine with social interaction to generate the distributions and dynamics of ‘representations.’ Recently, cognitive anthropologists have criticized such models. They make three points: mental representations are non-discrete, cultural transmission is highly inaccurate, and mental(More)
We have observed slow light propagation with a group velocity as low as 57.5+/-0.5 m/s at room temperature in a ruby crystal. A quantum coherence effect, coherent population oscillations, produces a very narrow spectral "hole" in the homogeneously broadened absorption profile of ruby. The resulting rapid spectral variation of the refractive index leads to a(More)
Human societies are based on cooperation among large numbers of genetically unrelated individuals. This behavior is puzzling from an evolutionary perspective. Because cooperators are unrelated it cannot be the result of kin selection, and the large scale seems to preclude explanations based on direct reciprocity. Alexander (1987) has proposed that(More)
Recent investigations have uncovered large, consistent deviations from the predictions of the textbook representation of Homo economicus (Alvin E. Roth et al., 1991; Ernst Fehr and Simon Gächter, 2000; Colin Camerer, 2001). One problem appears to lie in economists’ canonical assumption that individuals are entirely self-interested: in addition to their own(More)
We demonstrate a technique for generating tunable all-optical delays in room temperature single-mode optical fibers at telecommunication wavelengths using the stimulated Brillouin scattering process. This technique makes use of the rapid variation of the refractive index that occurs in the vicinity of the Brillouin gain feature. The wavelength at which the(More)
In this retrospective study, we compared the results of 1,283 open cholecystectomies (OCs) performed at our medical center during the pre-laparoscopic era with 1,107 laparoscopic cholecystectomies (LCs) performed from 1990 to 1992. There was no difference in the percentage of cases of acute and chronic cholecystitis in each time period (16.8% in each), nor(More)
Coincidence imaging is a technique that extracts an image of a test system from the statistics of photons transmitted by a reference system when the two systems are illuminated by a source possessing appropriate correlations. It has recently been argued that quantum entangled sources are necessary for the implementation of this technique. We show that this(More)