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Social learning (learning through observation or interaction with other individuals) is widespread in nature and is central to the remarkable success of humanity, yet it remains unclear why copying is profitable and how to copy most effectively. To address these questions, we organized a computer tournament in which entrants submitted strategies specifying(More)
In a survey of 505 rural Zimbabweans, iron overload was found almost exclusively among men who consumed traditional beer brewed in steel drums. Among drinkers aged over 45 years, 23 of 111 men (21%) had high serum ferritin and a transferrin saturation of over 70%, a combination that indicates a risk of liver disease and other pathological effects from(More)
The purpose of this book is to provide the reader with vital communication concepts and tools to assist in preparing for and responding to a severe influenza pandemic in the United States. The focus of the book is on the possibility of a severe pandemic. Although the concepts do apply to less intense public health challenges, they may not need to be(More)
  • R D Boyd
  • 1998
The possibility of differential sex proportions as a confounding factor in the Lovaas (1987) study is raised in this paper. It is argued that the chi-square analysis reported in the original study was inadequate and that the appropriate comparison should be made not between the experimental group and primary control group (Control Group 1) utilizing(More)
This article presents findings from an outcome survey of the effects of early intensive behavioral intervention (EIBI) for young children with autism in a community setting. Results from both individual case reviews and parent questionnaires are presented, with the data failing to support any instances of'recovery' while still yielding a high degree of(More)
The assumption that congenital rubella is commonly associated with microcephaly and mental retardation was examined. Among a rubella clinic population of 111 children, 92 children had vision sufficient to allow testing by the Leiter International Scale. The mean IQ for this group was 99.46 (SD, 19.5). Head circumference in this group correlated well with(More)
Darwinian processes should favour those individuals that deploy the most effective strategies for acquiring information about their environment. We organized a computer-based tournament to investigate which learning strategies would perform well in a changing environment. The most successful strategies relied almost exclusively on social learning (here,(More)
  • R Boyd
  • 2006
There has been a proliferation of models seeking to explain the evolution of altruism over the past few years, and Lehmann and Keller should be commended for this very well-reasoned and clearly written attempt to bring order out of chaos. There is much good sense in this paper, especially the emphasis on the importance of assortment for the evolution of(More)
The present study was undertaken to obtain data which would characterize pharmacist activities and prescription workload in a community pharmacy. Data on pharmacist activities were obtained by using a work sampling methodology. The proportion of time spent on each of 44 activities was obtained, and it was found that the proportion of time spent on(More)