Many of the most skilled and educated citizens of developing countries choose to emigrate. How may those societies respond to these facts? May they ever legitimately prevent the emigration of their citizens? Gillian Brock and Michael Blake debate these questions, and offer distinct arguments about the morality of emigration.

All of the chapters have been written especially for the book by the leading scholars in the field.Michael I. Posner is Professor of Psychology at the ...

This article examines the anatomy and circuitry of skills that, like reading, calculating, recognizing, or remembering, are common abilities of humans. While the anatomical areas active are unique to each skill there are features common to all tasks. For example, all skills produce activation of a small number of widely separated neural areas that appear necessary to perform the task. These neural areas relate to internal codes that may not be observed by any external behavior nor be reportable by the (...) performer. There is considerable plasticity to the performance of skills. Task components can be given priority through attention, which serves to increase activation of the relevant brain areas. Attention can also cause reactivation of sensory areas driven by input, but usually only after a delay. The threshold for activation for any area may be temporarily reduced by prior activation . Skill components requiring attention tend to cause interference resulting in the dual tasks effects and unified focus of attention described in many cognitive studies. Practice may change the size or number of brain areas involved and alter the pathways used by the skill. By combining cognitive and anatomical analyses, a more general picture of the nature of skill emerges. (shrink)

Current phylogenies show that paired fins and limbs are unique to jawed vertebrates and their immediate ancestry. Such fins evolved first as a single pair extending from an anterior location, and later stabilized as two pairs at pectoral and pelvic levels. Fin number, identity, and position are therefore key issues in vertebrate developmental evolution. Localization of the AP levels at which developmental signals initiate outgrowth from the body wall may be determined by Hox gene expression patterns along the lateral plate (...) mesoderm. This regionalization appears to be regulated independently of that in the paraxial mesoderm and axial skeleton. When combined with current hypotheses of Hox gene phylogenetic and functional diversity, these data suggest a new model of fin/limb developmental evolution. This coordinates body wall regions of outgrowth with primitive boundaries established in the gut, as well as the fundamental nonequivalence of pectoral and pelvic structures. BioEssays 20:371–381, 1998. © 1998 John Wiley & Sons Inc. (shrink)

How should we understand the political morality of migration? Are travel bans, walls, or carrier sanctions ever morally permissible in a just society? This book offers a new approach to these and related questions. It identifies a particular vision of how we might apply the notion of justice to migration policy - and an argument in favor of expanding the ethical tools we use, to include not only justice but moral notions such as mercy.

ERP studies have shown modulation of activation in left frontal and posterior cortical language areas, as well as recruitment of right hemisphere homologues, based on task demands. Furthermore, blood-flow studies have demonstrated changes in the neural circuitry of word processing based on experience. The neural areas and time course of language processing are plastic depending on task demands and experience.

We divided the many diverse comments on our book into categories. These are: theory, scope and goals of our project, methods, comments on specific anatomical areas, the concept of attention, consciousness and cognitive control, and finally other issues. Although many of the points of the critics are certainly well taken, we believe studies that have emerged since our book provide strong evidence that the general approach taken in our book is now yielding important new data on the relation of cognitive (...) processes to underlying brain activity. (shrink)

This volume explores how functional brain imaging techniques like positron emission tomography have influenced cognitive studies. The first chapter outlines efforts to relate human thought and cognition in terms of great books from the late 1800s through the present. Chapter 2 describes mental operations as they are measured in cognitive science studies. It develops a framework for relating mental operations to activity in nerve cells. In Chapter 3, the PET method is reviewed and studies are presented that use PET to (...) map the striate cortex and to activate extrastriate motion, color, and form areas. Chapter 4 shows how top down processes involving attention can lead to activation of these same areas in the detection of targets, visual search, and visual imagery. This chapter reveals complex networks of activations. Chapters 5 and 6 deal with the presentation of words. Chapter 5 illustrates PET studies of the anatomy of visual word processing and shows how the circuitry used for generating novel uses of words changes as the task becomes automated. Chapter 6 applies high density electrical recording to explore these activations in real time and to show how a constant anatomy can be reprogrammed by task instructions to produce and perform different cognitive tasks. Chapter 7 shows how studies of brain lesions and PET converge on common networks underlying attentional functions such as visual orienting, target detection, and maintenance of the alert state. Chapters 8 and 9 apply the network approach to examine normal development of attention in infants and pathological conditions resulting from brain damage, and psychiatric pathologies of depression, schizophrenia, and attention deficit disorder. In Chapter 10, new developments such as functional MRI are discussed in terms of future developments and integration of cognitive neuroscience. (shrink)

This paper examines the manner through which the Philippine government has utilized free trade in pursuing its development-oriented national security policies and strategies in the twenty-first century. It argues that against the backdrop of uneven economic development being perpetuated by a deeply entrenched oligarchic system and patronage culture, the primary referent of Philippine national security is its diminishing development space. Despite the government rhetoric with regard to the role of inclusive development in enhancing national security, the Philippine political economy remains (...) highly oligarchic and patrimonial. Such a condition has resulted in institutionalized inequality and structural poverty that undermine the country's supposedly development-based security model. The ability of the very few yet very powerful Filipino elites to transform the country into an oligarchipelago underscores the inefficiencies emanating from this type of politico-economic arrangement. In light of this, the paper evaluates the impacts of the Philippines' free trade activities on its overall level of development space by focusing on several crucial aspects of free trade that the government has failed to properly consider. Moreover, it scrutinizes the key factors that affect the utility of free trade for securing and enhancing the Philippines' development space. The paper concludes by arguing that the Philippine government's attempts at linking its development-centric security interests and free trade objectives have resulted not only in the preservation of uneven economic development and but also the further reinforcement of the existing oligarchic system and patronage culture in the country. (shrink)