Quantum systems have a holistic structure, which implies that they cannot be divided into parts. In order tocreate (sub)objects like individual substances, molecules, nuclei, etc., in a universal whole, the Einstein-Podolsky-Rosen correlations between all the subentities, e.g. all the molecules in a substance, must be suppressed by perceptual and mental processes.Here the particular problems ofGestalt (shape)perception are compared with the attempts toattribute a shape to a quantum mechanical system like a molecule. Gestalt perception and quantum mechanics turn out (on an (...) informal level) to show similar features and problems: holistic aspects, creation of objects, dressing procedures, influence of the observer, classical quantities and structures. The attribute classical of a property or structure means thatholistic correlations to any other quantity do not exist or that these correlations are considered as irrelevant and therefore eliminated (either deliberately and by declaration or in a mental process that is not under rational control). An example of animposed classical structure is the nuclear frame of a molecule. Candidates for classical properties that arenot imposed by the observer could be the charge of a particle or the handedness of a molecule. It is argued here that at least part of a molecule's shape can begenerated automatically by the environment. A molecular shape of this sort arises in addition to Lamb shift-type energy corrections. (shrink)

ZusammenfassungOhne einen speziellen philosophischen 〈ismus〉 zu akzeptieren und zu bevorzugen, werden die Begriffe 〈Phänomen〉 und 〈Realität〉 vom Stand‐punkt der täglichen Praxis des Physikers analysiert. Die logische Struktur der physikalischen Theorien, einschliesslich ihre charakteristischen Bezie‐hungen zu Beobachtung und Experiment, wird kurz aufgezeigt an Hand der klassischen Mechanik, der klassischen relativistischen Feldtheorie und Quantenmechanik als Beispiele. Es wird nachdrücklich betont, dass die Physiker ihre Wissenschaft als in Entwicklung begriffen ansehen. Das Problem stellt sich deshalb nie so, ob die gegenwärtigen Theorien gleich bleiben (...) werden, wie sie jetzt sind oder nicht, sondern vielmehr, in welcher Richtung sie sich ändern werden. (shrink)

The consensus among evolutionists seems to be that the morphological complexity of organisms increases in evolution, although almost no empirical evidence for such a trend exists. Most studies of complexity have been theoretical, and the few empirical studies have not, with the exception of certain recent ones, been especially rigorous; reviews are presented of both the theoretical and empirical literature. The paucity of evidence raises the question of what sustains the consensus, and a number of suggestions are offered, including the (...) possibility that certain cultural and/or perceptual biases are at work. In addition, a shift in emphasis from theoretical to empirical inquiry is recommended for the study of complexity, and guidelines for future empirical studies are proposed. (shrink)

Scientific knowledge grows at a phenomenal pace--but few books have had as lasting an impact or played as important a role in our modern world as The Mathematical Theory of Communication, published originally as a paper on communication theory more than fifty years ago. Republished in book form shortly thereafter, it has since gone through four hardcover and sixteen paperback printings. It is a revolutionary work, astounding in its foresight and contemporaneity. The University of Illinois Press is pleased and honored (...) to issue this commemorative reprinting of a classic. (shrink)

Jack Cohen and Ian Stewart explore the ability of complicated rules to generate simple behaviour in nature through 'the collapse of chaos'.

I Physics of Information Information, Physics, Quantum: The Search for Links John Archibald Wheeler Information from Quantum Measurements Benjamin Schumacher Local Accessibility of Quantum States William K. Wootters The Entropy of Black Holes V. F. Mukhanov Some Simple Consequences of the Loss of Information in a Spacetime with a Horizon Shin Takagi Why is the Physical World so Comprehensible? P. C. W. Davies II Laws of Physics and Laws of Computation Algorithmic Information Content, Church-Turing Thesis, Physical Entropy, and Maxwell’s Demon (...) W. E. Zurek Entropy and Information: How Much Information is Needed to Assign a Probability? Carlton M. Caves Complexity of Models J. Rissanen Laws and Boundary Conditions C. H. Woo How to Define Complexity in Physics, and Why Charles H. Bennett III Complexity and Evolution Requirements for Evolvability in Complex Systems: Orderly Dynamics and Frozen Components Stuart A. Kauffman Valuable Information Seth Lloyd Non-Equilibrium Polymers, Entropy, and Algorithmic Information Dilip K. Kondepudi The Dynamics of Complex Computational Systems Tad Hogg Computation at the Onset of Chaos James P. Crutchfield and Karl Young IV Physics of Computation Parallel Quantum Computation Norman Margolus Information Processing at the Molecular Level: Possible Realizations and Physical Constraints W. G. Teich and G. Mahler How Cheap Can Mechanics’ First Principles Be? Tommaso Toffoli Intermittent Fluctuations and Complexity Xiao-Jing Wang Information Processing in Visual Perception A. Zee V Probability, Entropy, and Quantum Thermodynamic Constraints on Quantum Axioms Asker Peres Entropy and Quantum Mechanics M. Hossein Páriovi Einstein Completion of Quantum Mechanics Made Falsifiable O. E. Rossler Quantum Mechanics and Algorithmic Complexity J. W. Barrett Probability in Quantum Theory E. T. Jaynes Quantum Measurements and Entropy H. D. Zeh VI Quantum Theory and Measurement Quantum Mechanics in the Light of Quantum Cosmology Murray Gell-Mann and James B. Hartle Information Dissipation in Quantum Cosmology and the Emergence of Classical Spacetime Jonathan J. Halliwell The Quantum Mechanics of Self-Measurement David Z. Albert The Quantum-Classical Correspondence in Light of Classi- cal Bell’s and Quantum Tsirelson’s Inequalities X. A. Khalfin Some Progress in Measurement Theory: The Logical Inter- pretation of Quantum Mechanics Roland Omnes. (shrink)

To make progress on the problem of consciousness, we have to confront it directly. In this paper, I first isolate the truly hard part of the problem, separating it from more tractable parts and giving an account of why it is so difficult to explain. I critique some recent work that uses reductive methods to address consciousness, and argue that such methods inevitably fail to come to grips with the hardest part of the problem. Once this failure is recognized, the (...) door to further progress is opened. In the second half of the paper, I argue that if we move to a new kind of nonreductive explanation, a naturalistic account of consciousness can be given. I put forward my own candidate for such an account: a nonreductive theory based on principles of structural coherence and organizational invariance, and a double-aspect theory of information. (shrink)

The relevance of the Cartesian cut as a conceptual tool to separate matter and mind in the tradition of a dualistic world view is addressed. Modern science has developed an increasing number of concepts requiring that such a cut be considered neither as a priori prescribed nor as impenetrable. Two important examples are the concepts of complexity and meaning. They are subjects of physics as the science of matter and cognitive science as the science of the mind, respectively. Their mutual (...) relationships are discussed to some detail, and certain elements of a `post-Cartesian' way of thinking are indicated. (shrink)