The effects of striatal dopamine (DA) on behavior have been widely investigated over the past decades, with “phasic” burst firings considered as the key expression of a reward prediction error responsible for reinforcement learning. Less well studied is “tonic” DA, where putative functions include the idea that it is a regulator of vigor, incentive salience, disposition to exert an effort and a modulator of approach strategies. We present a model combining tonic and phasic DA to show how different outflows triggered (...) by either intrinsically or extrinsically motivating stimuli dynamically affect the basal ganglia by impacting on a selection process this system performs on its cortical input. The model, which has been tested on the simulated humanoid robot iCub interacting with a mechatronic board, shows the putative functions ascribed to DA emerging from the combination of a standard computational mechanism coupled to a differential sensitivity to the presence of DA across the striatum. (shrink)

Sometimes it is indeterminate what an agent morally ought do. This generates a Decision Ought Challenge—to give moral guidance to agents in such a scenario. This article is a field guide to the options for a theory of the decision ought for cases of indeterminacy. Three categories of view are evaluated, and the best representative for each is identified.

Many accounts of structural rationality give a special role to logic. This paper reviews the problem case of clear-eyed logical uncertainty. An account of rational norms on belief that does not give a special role to logic is developed: doxastic probabilism.

Furthermore, adults with decision-making capacity, including pregnant women, can currently accept interventions with moderate net risks for themselves in other settings (e.g., open f...

There is great skepticism about the admittance of expert normative ethics testimony into evidence. However, a practical analysis of the way ethics testimony has been used in courts of law reveals that the skeptical position is itself based on assumptions that are controversial. We argue for an alternative way to understand such expert testimony. This alternative understanding is based on the practice of clinical ethics.

In a broadcast talk delivered in 1956, the late J. L. Austin began by outlining to his listeners his now well-known concept of ‘the performative utterance and its infelicities’; and at the end of that first section of his talk he made this comment: ‘That equips us, we may suppose, with two shining new tools to crack the crib of reality maybe. It also equips us – it always does – with two shining new skids under our metaphysical feet’. In (...) this talk I intend to illustrate a particular respect in which, in moral philosophy, the partial pessimism of Austin's comment has proved abundantly justified. I shall try to show how in this field one shining new tool has led in fact to the skidding of moral philosophers' feet – how one bright idea has led some influential theorists off in the wrong direction, and the rest of us back in the end, with rather little gained, to a position not far from that of our predecessors of about a hundred years ago. This dismal story, I should in justice make clear at the outset, is not that of the whole of moral philosophy, not even of moral philosophy in English; I shall be tracing only one out of several concurrent lines of thought, but the line which I shall trace will be, I think, readily recognised as having been, and perhaps as still being, more conspicuous than most. (shrink)

After the nineteenth chapter, where some remarkable phenomena are presented, in the twentieth chapter the author is looking for the main storyline that can become decisive for the course of events as a whole. To do this, he turns to the works of individual ancient authors. This approach will serve in the future to create philosophical hermeneutics.

This book is available either individually, or as part of the specially-priced Arguments of the Philosphers Collection.