An evolutionary system for neural logic networks using genetic programming and indirect encoding

Nowadays, intelligent connectionist systems such as artificial neural networks have been proved very powerful in a wide area of applications. Consequently, the ability to interpret their structure was always a desirable feature for experts. In this field, the neural logic networks (NLN) by their definition are able to represent complex human logic and provide knowledge discovery. However, under contemporary methodologies, the training of these networks may often result in non-comprehensible or poorly designed structures. In this work, we propose an evolutionary system that uses current advances in genetic programming that overcome these drawbacks and produces neural logic networks that can be arbitrarily connected and are easily interpretable into expert rules. To accomplish this task, we guide the genetic programming process using a context-free grammar and we encode indirectly the neural logic networks into the genetic programming individuals. We test the proposed system in two problems of medical diagnosis. Our results are examined both in terms of the solution interpretability that can lead in knowledge discovery, and in terms of the achieved accuracy. We draw conclusions about the effectiveness of the system and we propose further research directions.     

Health Beliefs and Practices in an Isolated Polygamist Community of Southern Utah

Short Creek is a largely closed and isolated community on the border between Utah and Arizona, made up of the sister towns of Hildale, Utah, and Colorado City, Arizona. Beginning from childhood, the 6,000 or so members of the Fundamentalist Church of Jesus Christ of Latter-Day Saints (FLDS) are brought up in a lifestyle of plural marriage, meaning a marriage among one man and more than one woman, and are surrounded by their peers in “the covenant.” A lifestyle of plural marriage is likely to affect the health of community members, but its effects have not been studied because of the community’s isolation and distrust of outsiders. This paper addresses several questions that arise in contemplating the health of the Short Creek community: What are the health beliefs in this community, and what are their historical bases? Where do families seek medical care, and for what or at what threshold of illness or injury? What is the attitude of care providers serving this community, and how are the providers viewed by the community? More broadly, this paper examines the ways in which polygamy configures health. In order to meet this objective, this paper aims first to provide a brief account of this community’s history and demographic profile, followed by a discussion of health care in this community and how it is affected by the practice of plural marriage, with the data comprised of qualitative interviews with health care providers to the community. The goals of this project are to gain a rich, historically nuanced understanding of the health of community members, and to identify directions for further academic and policy research. Our findings indicate that health in this community is shaped by limited resources, an attitude of health fatalism, and a profound insularity and corresponding isolation from the outside world.     

Women's neuroethics? Why sex matters for neuroethics

The Neuroethics Affinity Group of the American Society for Bioethics and Humanities (ASBH) met for the third time in October 2007 to review progress in the field of neuroethics and consider high-impact priorities for the future. Closely aligned with ASBH's own goals of recruiting junior scholars to bioethics and mentoring them to successful careers, the Neuroethics Affinity Group placed a call for new ideas to be presented at the Group meeting, specifically by junior attendees. One group responded with the idea to probe a new direction for neuroethics focused on the neuroscience of gender differences. In the spirit of full disclosure, two of the authors are a student (Chalfin) and fellow (Murphy) of the program I formerly directed at Stanford University. The third (Karkazis) is junior faculty there. The intellectual ownership of the ideas in the report below, however, are entirely theirs. Like lit torches in a juggling act, there are many directions this project can go. The report is a snapshot of these authors' first iteration of the concept of women's neuroethics. Many thanks are extended to participants of the ASBH Neuroethics Affinity Group meeting whose enthusiasm and feedback was immensely helpful in shaping the concept and moving it ahead.