Stephen L. Judd

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Many distributed collective decision-making processes must balance diverse individual preferences with a desire for collective unity. We report here on an extensive session of behavioral experiments on biased voting in networks of individuals. In each of 81 experiments, 36 human subjects arranged in a virtual network were financially motivated to reach(More)
We report on human-subject experiments on the problems of coloring (a social differentiation task) and consensus (a social agreement task) in a networked setting. Both tasks can be viewed as coordination games, and despite their cognitive similarity, we find that within a parameterized family of social networks, network structure elicits opposing behavioral(More)
Sex differences in macular pigment (MP) optical density (measured psychophysically) were examined. Concentrations of lutein and zeaxanthin (L and Z) (non-separated) and beta-carotene (BC) in the blood were determined using reverse phase high-performance liquid chromatography. Dietary intake of L and Z, BC, fat, and iron were estimated by questionnaire.(More)
We use equivariant bifurcation theory to investigate pattern selection at the onset of a Turing instability in a general two-component reaction-diiusion system. The analysis is restricted to patterns that periodically tile the plane in either a square or hexagonal fashion. Both simple periodic patterns (stripes, squares, hexagons, and rhombs) and(More)
We use equivariant bifurcation theory to investigate pattern selection at the onset of a Turing instability in a general two-component reaction-diffusion system. The analysis is restricted to patterns that periodically tile the plane in either a square or hexagonal fashion. Both simple periodic patterns (stripes, squares, hexagons, and rhombs) and(More)
Public health authorities need a surveillance system that is sensitive enough to detect a disease outbreak early to enable a proper response. In order to meet this challenge we have deployed a pilot component-based system in Albuquerque, NM as part of the National Biodefense Initiative (BDI). B-SAFER gathers routinely collected data from healthcare(More)
S i119 entered by the BCDS into a database and analyzed using descriptive statistics and graphing techniques. Daily values are analyzed using a variation of the Shewhart control chart method. Graphs have four components: (1) daily data plotted for each syndrome, (2) an average of all values plotted to date, (3) upper and lower confidence levels (99.7%) for(More)
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