Neuroscientists are searching for the engram within the conceptual framework established by John Locke's theory of mind. This framework was elaborated before the development of information theory, before the development of information processing machines and the science of computation, before the discovery that molecules carry hereditary information, before the discovery of the codon code and the molecular machinery for editing the messages written in this code and translating it into transcription factors that mark abstract features of organic structure such as (...) anterior and distal. The search for the engram needs to abandon Locke's conceptual framework and work within a framework informed by these developments. The engram is the medium by which information extracted from past experience is transmitted to the computations that inform future behavior. The information-conveying symbols in the engram are rapidly generated in the course of computations, which implies that they are molecules. (shrink)

Owing to the illegibility of parts of the Fronto palimpsest and the carelessness of its first editor, Cardinal Mai, it was impossible, even after the critical labours of Niebuhr and his colleagues, to come to any satisfactory conclusion as to the chronology of the Letters. But the edition of S. A. Naber in 1867, which had the advantage of a fresh collation of the MS. by G. N. Du Rieu, further reinforced subsequently by a new examination of the Codex due (...) to W. Studemund, held out a better prospect of success. The labours of C. Brakman in the same direction, published in 1902, have also thrown fresh light upon the subject. Yet the critical world has long been awaiting the appearance of the authoritative recension by Professor E. Hauler of Vienna, who has spent infinite pains over a further, and what may well be a final, inspection of the Codex. A great desideratum, which it is much to be hoped that the new edition will supply, is an exact indication, as far as may be, of the extent of each lacuna in pages, lines, words, or letters. A knowledge of how much is lost in each case is essential for the true understanding of the sequence of thought and time in what remains. (shrink)

This book charts new ground, specifically, in its negotiation of a definition of animal welfare, in its systematic discussion of the organizations actually ...

This paper and its predecessor () are about the question: 'Are the events in the entire universe encoded in and predictable from any of its parts?' To approach a positive answer in classical physics, the following result is proved and commented on: in Newton's theory of gravitation, the entire trajectory of a particle can be predicted given any segment of it, regardless of how the other particles are moving-provided that there is only a finite number of particles and that their (...) speeds remain bounded. (It is this condition, together with a set of parameters characterising the motion of the other particles, which enables us to estimate the effect of the other particles on the trajectory of the given particle.) The extension of this result to other theories, in particular to special relativity, is discussed. (shrink)