Sustained attention, a key cognitive skill that improves during childhood and adolescence, tends to be worse in some emotional and behavioural disorders. Sustained attention is typically studied in non-affective task contexts; here, we used a novel task to index performance in affective versus neutral contexts across adolescence (N = 465; ages 11–18). We asked whether: (i) performance would be worse in negative versus neutral task contexts; (ii) performance would improve with age; (iii) affective interference would be greater in younger adolescents; (...) (iv) adolescents at risk for depression and higher in anxiety would show overall worse performance; and (v) would show differential performance in negative contexts. Results indicated that participants performed more poorly in negative contexts and showed age-related performance improvements. Those at risk of depression performed more poorly than those at lower risk. However, there was no difference between groups as a result of affective context. For anxiety there was no difference in performance as a function of severity. However, those with higher anxiety showed less variance in their reaction times to negative stimuli than those with lower anxiety. One interpretation is that moderate levels of emotional arousal associated with anxiety make individuals less susceptible to the distracting effects of negative stimuli. (shrink)

The history of the National Health Service research ethics system in the UK and some of the key drivers for its change into the present system are described. It is suggested that the key drivers were the unnecessary delay of research, the complexity of the array of processes and contradictions between research ethics committee (REC) decisions. It is then argued that the primary drivers for this change are and will be replicated by the systems of research ethics review being put (...) in place at UK universities in response to the Economic and Social Research Council research ethics framework. It is argued that this is particularly problematic for multi-centre review and for researchers who switch institutions. Finally, some potential solutions to this problem and their feasibility are discussed. (shrink)

How do we acquire knowledge through a sensory input from our environment? In The Enigma of Perception, D.L.C. Maclachlan revives the traditional causal representative theory of perception which dominated philosophical thinking for hundreds of years by revealing the important element of truth the theory contained. The traditional theory was not a complete explanation of perception, because it presupposed a causal system including both the physical objects and the subjective experiences. The pattern of inference from sensations to external objects, which lies (...) at its heart, is nevertheless legitimate, because the assumptions on which it depends are generally recognized as true. The emerging enigma is how to explain this original knowledge of the world on which the traditional theory depends. The key idea is that sense experience is constructed as a response to sensory input - an act whose purpose is to represent a reality beyond the cognitive subject. The Enigma of Perception develops original ideas to explain this process in detail, with help from numerous philosophers from John Locke to David Chalmers. (shrink)

The working situation prevailing in theoretical and experimental physics today is held to be inseparable from the interpretation of quantum theory, and constitutes an embodiment of its implicit difficulties. Such an understanding of the present situation in fundamental physics provides a quite different basis for ideas than the formulation of alternative courses of action (experiments) or alternative forms of knowledge (theories), which proceeds from the belief in a full separation of theory from experiment in this field. It is argued that (...) this underlying belief is not well founded. One must therefore consider the technical details of the field together with its foundations, and thus especially the situation produced by fundamental physics, including, in particular, the growth of high-energy technology, which exerts a determining influence on the further course of the subject. (shrink)

In this thesis I shall summarize and critically examine the central features of the theories of values of four contemporary moral philosophers: A.J. Ayer, C.L. Stevenson, R.M. Hare, and P.H. Nowell - Smith. I shall first look back, however, to the theory of moral philosophy of the most influential 'forefather' of this group, David Hume. Hume's theory stands as a challenge to moral philosophers who would assume that moral judgments are primarily, in some sense, acts of 'reason'. Although our four (...) contemporaries follow Hume in this, his challenge, in the form I shall indicate shortly, will provide the main theme for this thesis. (shrink)

The causal representative theory of perception dominated theory of knowledge for hundreds of years after it was put on the map by Descartes and Locke. It is now almost extinct. How could this happen? The theory collapsed because it could not explain how we acquire knowledge of the external world, since it presupposes a causally organized system of external objects producing sensations in us. This presupposition, however, is generally recognized as true, so that the pattern of causal inference at the (...) heart of the theory is surely justified. The theory cannot explain how we originally acquire our knowledge of the external world, but it is entitled on a second pass to correct our empirical beliefs, where necessary. This includes replacing our naive picture of the physical world with a more sophisticated scientific conception, which downgrades secondary qualities. This was, indeed, the main reason why it was originally introduced by Descartes and Locke, and has been the source of its attraction over the years. (shrink)