Theses on the semiotic study of life as presented here provide a collectively formulated set of statements on what biology needs to be focused on in order to describe life as a process based on semiosis, or sign action. An aim of the biosemiotic approach is to explain how life evolves through all varieties of forms of communication and signification (including cellular adaptive behavior, animal communication, and human intellect) and to provide tools for grounding sign theories. We introduce the concept (...) of semiotic threshold zone and analyze the concepts of semiosis, function, umwelt, and the like as the basic concepts for theoretical biology. (shrink)

The scientific, ethical, and policy issues raised by research involving the engraftment of human neural stem cells into the brains of nonhuman primates are explored by an interdisciplinary working group in this Policy Forum. The authors consider the possibility that this research might alter the cognitive capacities of recipient great apes and monkeys, with potential significance for their moral status.

Kalevi Kull and colleagues recently proposed eight theses as a conceptual basis for the field of biosemiotics. We use these theses as a framework for discussing important current areas of debate in biosemiotics with particular reference to the articles collected in this issue of Zygon.

Each generation of evolutionary biologists has brought a fresh wave of attempts to answer the evolutionary riddle of altruism. However, none describe how such a condition could incrementally evolve from a prior condition of non-cooperation. This chapter describes a mechanism that could spontaneously and incrementally give rise to a synergistic codependence among individuals within a social group. It shows that prolonged social living in the absence of reproductive cost can mask selection-maintaining traits important for autonomous living, causing them to drift (...) and degrade to the point where individuals can no longer succeed outside the social context. This ‘social addiction’ will subsequently favour traits that maintain social cohesion because of the high cost of group dispersion. This mechanism contributes a missing complementary component to existing selection-based explanations of the evolution of pro-social and altruistic behaviours. (shrink)