Biologists Richard Dawkins and Stephen Jay Gould have recently extended their decades-old disagreements about evolution to the issue of the nature and reality of evolutionary progress. According to Gould, 'progress' is a noxious notion that deserves to be expunged from evolutionary biology. In Dawkins' view, on the other hand, progress is one of the most important, pervasive and inevitable aspects of evolution. Simple appeals to 'the evidence' are clearly insufficient to resolve this disagreement, since it is precisely the interpretation of (...) the evidence that is in dispute. Scientific controversies in general, and the Dawkins/Gould dispute over evolutionary progress in particular, are worth examining in some detail because doing so sheds light on the interconnected roles of methodological and contextual factors in the formation, articulation and defense of scientific claims. My aim in this paper is to clarify the structure of the Dawkins/Gould dispute by analyzing it in terms of a tri-level model of scientific controversies, involving 'top-level' substantive disagreements, 'middle-level' methodological differences, and 'bottom-level' differences in historical and social factors. This simple three-tiered model is sufficiently abstract to have more general applicability to other scientific controversies. (shrink)

What should human languages be like if humans are the products of Darwinian evolution? Between Darwin’s day & like the peoples speaking them are higher or lower in an evolutionarily generated scale This paper charts some of the changes in the Darwinian tradition that transformed the notion of human linguistic equality from creationist heresy., our own, expectations about evolution’s imprint on language have changed dramaticallyIt is now a commonplace that, for good Darwinian reasons, no language is more highly evolved than (...) any otherBut Darwin, in The descent of man, defended the opposite view: different languages. (shrink)

The playback experiment -- the playing back of recorded animal sounds to the animals in order to observe their responses -- has twice become central to celebrated researches on non-human primates. First, in the years around 1890, Richard Garner, an amateur scientist and evolutionary enthusiast, used the new wax cylinder phonograph to record and reproduce monkey utterances with the aim of translating them. Second, in the years around 1980, the ethologists Peter Marler, Robert Seyfarth, and Dorothy Cheney used tape recorders (...) in a broadly similar way to test whether the different predator calls of one monkey species, vervet monkeys, warn about different kinds of predator. This paper explores the circumstances leading to the ca. 1890 invention and the ca. 1980 reinvention of the primate playback experiment. In both instances, I show, the experiment served as a riposte to those arguing, on scientific grounds, that an unbridgeable gap divides human language from animal communication. I also consider how far progress in technology explains the timing of invention and reinvention. I conclude with some reflections on sifting contingent from inevitable aspects of the history of the primate playback experiment, and of scientific achievements more generally. (shrink)

In The Variation of Animals and Plants under Domestication, published in 1868, Darwin used the metaphor of the architect to argue in favor of natural autonomy and to clarify the role of chance in his theory of adaptive change by variation and natural selection. In this article, I trace the history of this important heuristic instrument in Darwin's writings and letters and suggest that this metaphor was important to Darwin because it helps him to explain the role of chance, and (...) gives an argument in favor of the free will. (shrink)

Many have argued that there is no reason why natural selection should cause directional increases in measures such as body size or complexity across evolutionary history as a whole. In this paper I argue that this conclusion does not hold for selection for adaptations to environmental variability, and that, given the inevitability of environmental variability, trends in adaptations to variability are an expected feature of evolution by natural selection. As a concrete instance of this causal structure, I outline how this (...) may be applied to a trend in phenotypic plasticity. (shrink)