The posterior parietal cortex (PPC) is the most likely site where egocentric spatial relationships are represented in the brain. PPC cells receive visual, auditory, somaesthetic, and vestibular sensory inputs; oculomotor, head, limb, and body motor signals; and strong motivational projections from the limbic system. Their discharge increases not only when an animal moves towards a sensory target, but also when it directs its attention to it. PPC lesions have the opposite effect: sensory inattention and neglect. The PPC does not seem (...) to contain a “map” of the location of objects in space but a distributed neural network for transforming one set of sensory vectors into other sensory reference frames or into various motor coordinate systems. Which set of transformation rules is used probably depends on attention, which selectively enhances the synapses needed for making a particular sensory comparison or aiming a particular movement. (shrink)

Parti INTRODUCTION Wittgenstein sometimes suggested looking on words as instruments, for example in the following passages from ...

Roman Catholic moral theology follows a centuries-old tradition of moral reflection. Contemporary Roman Catholic moral theory applies these traditional arguments to the realm of medical ethics, including the issues of active euthanasia and physician-assisted suicide. Unavoidable moral limits on licit medical intervention sometimes require that the moral duty to treat, cede to the duty to cease treatment when measures become more harmful than beneficial to the patient. This does not reduce the need for the compassionate use of palliative care in (...) response to suffering. However, it does mean that rather than being excessively committed to maintaining mere biological human life, or actively seeking death, that we learn a sober realism about the limits of human life. Catholic moral analysis examines an act objectively, both in its relation to the agent and as a material event in the world. This allows both the virtuous or vicious intentions of the agent and the effects of the action to be included in its moral evaluation. Thus, Catholic moral analysis is both quasi-deontological and quasi-consequentialist. Objectively, active euthanasia and physician-assisted suicide, as acts of deliberate killing, are seen as repugnant, in that they fail to incarnate a benign inner intention or to form an agent in virtue. Catholic moral theology is extremely skeptical that an act of intending death directly can be consonant with a sincere compassion for the dying, suffering person and views it as a direct negation of the precious gift of human life. (shrink)

Avez-vous remarqué que dans le monde tout ce qui compte va par quatre? La musique : timbre, harmonie, rythme et mélodie. Le repérage : altitude, latitude, longitude et datation. Les quatre aspects de la cause: pour quoi, avec quoi, par quoi et selon quoi? Les forces de la nature : interactions faible, forte, électromagnétique et gravitationnelle... Les vingt-quatre particules élémentaires qui constituent la matière une famille de six leptons associée à trois familles de quarks. Et aussi la logique d'un discours (...) nuancé : oui, non, oui et non, ni oui ni non. Pourquoi quatre est-il partout? La notion de quaternité apporte une réponse à la fois simple et surprenante à cette question. A partir d'exemples tirés de l'expérience humaine, les auteurs en dégagent les aspects structurels et s'en servent pour approfondir le sens des mathématiques et de divers autres domaines liés à la genèse de la connaissance. Il s'agit d'une nouvelle épistémologie, fondée sur un modèle logique qui complète celui d'Aristote. (shrink)

Contemporary problems associated with the notion of determinism are focused by this symposium in three major areas of inquiry--philosophy, physical science, and law and moral responsibility. Determinism in modern physics is capably analyzed by a number of eminent contributors; but with respect to its significance for a philosophy of nature, little that is new or suggestive emerges from this analysis. The distinction between "hard" and "soft" determinism and its implications in legal and moral contexts provoke the most valuable part of (...) the discussion.--J. F. D. (shrink)

Much ink has been spilt in consideration of the once pervasive reliance on military metaphors to depict the relationships between science and religion in the nineteenth century. This has resulted in historically sensitive treatments of secularization; and the realization that the relationship between science and religion was not a bloody war between intellectual nation states, but a protracted divorce of former partners. Moreover, historians of science have been encouraged to throw off the yoke of the internalism–externalism debate, and to explore (...) the cultural boundaries that impinged upon practitioners of a natural knowledge of the world. Within the historiography of nineteenth-century science, this has resulted in many new perspectives on science and natural knowledge in relation to cultural control and authority. (shrink)