E. J. Lowe

(1950 - 2014)

In this innovative study of the relationship between persons and their bodies, E. J. Lowe demonstrates the inadequacy of physicalism, even in its mildest, non-reductionist guises, as a basis for a scientifically and philosophically acceptable account of human beings as subjects of experience, thought and action. He defends a substantival theory of the self as an enduring and irreducible entity - a theory which is unashamedly committed to a distinctly non-Cartesian dualism of self and body. Taking up the physicalist challenge to any robust form of psychophysical interactionism, he shows how an attribution of independent causal powers to the mental states of human subjects is perfectly consistent with a thoroughly naturalistic world view. He concludes his study by examining in detail the role which conscious mental states play in the human subject's exercise of its most central capacities for perception, action, thought and self-knowledge.

Ted Honderich's 'Radical Externalism' concerning the nature of consciousness is a refreshing, and in many ways very appealing, approach to a long- standing and seemingly intractable philosophical conundrum. Although I sympathize with many of his motivations in advancing the theory and share his hostility for certain alternative approaches that are currently popular, I will serve him better by playing devil's advocate than by simply recording my points of agreement with him. If his theory is a good one, it should be able to stand up to the strongest criticisms that we can muster against it. I shall do my best to articulate some of those criticisms as forcefully as I can.

In this book Jonathan Lowe offers a lucid and wide-ranging introduction to the philosophy of mind. Using a problem-centred approach designed to stimulate as well as instruct, he begins with a general examination of the mind-body problem and moves on to detailed examination of more specific philosophical issues concerning sensation, perception, thought and language, rationality, artificial intelligence, action, personal identity and self-knowledge. His discussion is notably broad in scope, and distinctive in giving equal attention to deep metaphysical questions concerning the mind and to the discoveries and theories of modern scientific psychology. It will be of interest to any reader with a basic grounding in modern philosophy.

Recently, Terry Horgan and Matjaž Potrč have defended the thesis of ‘existence monism’, according to which the whole cosmos is the only concrete object. Their arguments appeal largely to considerations concerning vagueness. Crucially, they claim that ontological vagueness is impossible, and one key assumption in their defence of this claim is that vagueness always involves ‘sorites-susceptibility’. I aim to challenge both the claim and this assumption. As a consequence, I seek to undermine their defence of existence monism and support a common-sense pluralist ontology of ‘ordinary objects’ as being fully consistent with a thoroughgoing metaphysical realism.

I propose a fourfold categorisation of entities according to whether or not they possess determinate identity-conditions and whether or not they are determinately countable. Some entities – which I call ‘individual objects’ – have both determinate identity and determinate countability: for example, persons and animals. In the case of entities of a kind K belonging to this category, we are in principle always entitled to expect there to be determinate answers to such questions as ‘Is x the same K as y?’ and ’How many Ks are there satisfying condition C?’, even if we may sometimes be unable in practice to discover what these answers are. But other entities apparently lack either determinate identity, or determinate countability, or both. In these terms I try to explain certain important ontological differences between familiar macroscopic objects and various rather more esoteric entities, such as the ‘particles’ of quantum physics, quantities of material stuff, and tropes or property instances.

David Lewis, following in the tradition of Broad, Quine and Goodman, says that change in an object X consists in X's being temporally extended and having qualitatively different temporal parts. Analogously, change in a spatially extended object such as a road consists in its having different spatial parts . The alternative to this view is that ordinary objects undergo temporal change in virtue of having different intrinsic non-relational properties at different times. They endure, remaining the same object throughout change, whereas Lewis's temporally extended 4D objects perdure.It is impossible to come down on one side or the other of the endurance/perdurance debate without a clear and unambiguous understanding of what ‘endurance’ is. ‘Perdurance’ is clear enough. Every 4D object of non-zero temporal thickness perdures simply by having temporal extension, i.e. by having different temporal parts, or stages, at different times. But Lewis muddies the waters by giving a confused and ultimately untenable definition of endurance.His first step is to cover both perduring and enduring by offering the neutral word persist. ‘Let us say that something persists iff, somehow or other, it exists at various times’ . Something then perdures if it persists by having different temporal parts at different times, no one part being wholly present at more than one time. In contrast, a thing endures if it persists by being wholly present at more than one …