We study human performance in two classical NP‐hard optimization problems: Set Cover and Maximum Coverage. We suggest that Set Cover and Max Coverage are related to means selection problems that arise in human problem‐solving and in pursuing multiple goals: The relationship between goals and means is expressed as a bipartite graph where edges between means and goals indicate which means can be used to achieve which goals. While these problems are believed to be computationally intractable in general, they become more (...) tractable when the structure of the network resembles a tree. Thus, our main prediction is that people should perform better with goal systems that are more tree‐like. We report three behavioral experiments which confirm this prediction. Our results suggest that combinatorial parameters that are instrumental to algorithm design can also be useful for understanding when and why people struggle to choose between multiple means to achieve multiple goals. (shrink)

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps, and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may (...) freely copy and distribute this work, as no entity has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant. (shrink)

Abstract. This introductory chapter was written in 1996, for a new book of review articles on the emerging science of consciousness, specifically aimed at undergraduate and postgraduate students by experts in the relevant fields. Following on a brief history, the chapter moves on to definitions of consciousness and background philosophical issues, and then introduces a unified, non-reductionist scientific approach. It then summarises major issues for studies of consciousness in cognitive psychology, including studies of attention, memory, the extent of preconscious analysis (...) and the relation of consciousness more generally to human information processing. It then turns to the neuropsychology of consciousness, starting with some apparent neural requirements for the transition from preconscious to conscious states, various clinical dissociations of consciousness, conditions for integration (or binding) and, finally, clinical applications, including different forms of mind/body interaction and evidence for the causal efficacy of mental states. The chapter concludes that while some of the ancient problems of consciousness remain unsolved, its study has become the subject of a rapidly developing science. (shrink)

Produced in 1961 using film shot by official war photographers provided by the Australian War Memorial in Canberra, this 26 part series covers every major ...

This dissertation constitutes an inquiry into the formal aspects of a particular form of conceptual intentional realism: Holistic Realist Ramified Conceptualism. Several axiomatic systems, which have this theory as their philosophical background are developed and/or studied from a syntactical and semantical point of view. ;Among systems studied are Cocchiarella's RRC$\sbsp{\lambda}{\*}$ and HRRC$\sbsp{\lambda}{\*}$. A set theoretical semantics for these systems is developed. Also, completeness theorems with respect to certain extensions of RRC$\sbsp{\lambda}{\*}$ and HRRC$\sbsp{\lambda}{\*}$ and certain notions of validity related to that (...) semantics are proved. A relative consistency proof of RRC$\sbsp{\lambda}{\*}$, HRRC$\sbsp{\lambda}{\*}$ and other systems is given. ;An axiomatic system for identity free realist ramified conceptualism involving indiscernibility relative to constructive concepts is developed. A set theoretical semantics for this system is constructed. A completeness theorem with respect to certain extensions of the identity-free system and a notion of validity related to that semantics is proved. ;Epistemic considerations are brought into this inquiry by introducing an epistemic operator into the logical syntax. Such an operator corresponds intuitively to the idea of constructive knowability. A philosophical discussion of this idea is presented and on the basis of this discussion an epistemic logical theory is formulated. It is shown that this system has HRRC$\sbsp{\lambda}{\*}$ as a proper subsystem. On the basis of the epistemic logical theory, an axiomatic system is introduced from which Peano's arithmetic is deduced. In this way, it is shown that arithmetic can be developed axiomatically on conceptualist foundations. (shrink)

Within psychology and the brain sciences, the study of consciousness and its relation to human information processing is once more a focus for productive research. However, some ancient puzzles about the nature of consciousness appear to be resistant to current empirical investigations, suggesting the need for a fundamentally different approach. In Velmans I have argued that functional accounts of the mind do not `contain' consciousness within their workings. Investigations of information processing are not investigations of consciousness as such. Given this, (...) first-person investigations of experience need to be related nonreductively to third-person investigations of processing. For example, conscious contents may be related to neural/physical representations via a dual-aspect theory of information. Chalmers arrives at similar conclusions. But there are also theoretical differences. Unlike Chalmers I argue for the use of neutral information processing language for functional accounts rather than the term `awareness'. I do not agree that functionalctional equivalence cannot be extricated from phenomenal equivalence, and suggest a hypothetical experiment for doing so - using a cortical implant for blindsight. I argue that not all information has phenomenal accompaniments, and introduce a different form of dual-aspect theory involving `psychological complementarity'. I also suggest that the hard problem posed by `qualia' has its origin in a misdescription of everyday experience implicit in dualism. (shrink)

I propose a realist theory of laws formulated in terms of tropes that avoids both the problems of the "best-systems-analysis" and the "inference problem" of realism of universals. I analyze the concept of an exceptional situation, characterized as a situation in which a particular object satisfies the antecedent but not the consequent of the regularity associated with a law, without thereby falsifying that law. To take this possibility into account, the properties linked by a law must be conceived as dispositional (...) and not necessarily manifest. (shrink)

This dissertation analyzes the three main philosophical movements which informed the intellectual world of Paul and his Greco-Roman contemporaries during the 1st century B.C.E. through the 2nd century C.E. In Part I, I analyze the moral transformation systems of the Middle Platonists , Neo-Stoics , and Greco-Roman Epicureans . I pay attention to the language of power in the analyses of Chapters 1--3, and to how power plays a salient role in philosophical discussions on the passions and on their role (...) in moral progress. What emerges from Part I are the following main conclusions: Despite the very different conceptualizations of the passions in Platonism, Stoicism, and Epicureanism, all three schools nonetheless viewed desire as a form of power and self-mastery over them as an expression of the sage's power. The power of the philosopher was the power of sight. That is, the sage saw himself and his potential errors correctly; and the sage saw the moral standard according to which one should conform. ;Part II is an attempt to show how a study of ancient philosophy of mind can help inform our understanding of Paul's letter recipients and Paul himself. The test case is the situation at Roman Corinth. Of all the philosophies of mind discussed in Part I, I make the initial case that the ideological framework which best explains the attitudes of the Corinthian strong over such issues such as sex with prostitutes is Epicurean philosophy and their ethics of the stomach. Sex is a natural desire and so is permissible in their moral framework. Finally, Chapter 5 examines extensively the external evidence for an Epicurean movement in the city of Roman Corinth. It makes the case for the presence of Epicurean converts among Corinth's urban leadership who, as immigrants, moved to Corinth from neighboring Greek cities and from Rome itself when Corinth was refound as a Roman colony in 44 B.C.E. The greatest epigraphic evidence for Corinthian Epicureans are the inscriptions dedicated to Junia Theodora and Gallio. (shrink)

Dieses Buch ist bis heute eine der populärsten Darstellungen der Relativitätstheorie geblieben. In der vorliegenden Version haben J. Ehlers und M. Pössel vom Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut) in Golm/Potsdam den Bornschen Text kommentiert und einen den anschaulichen, aber präzisen Stil Borns wahrendes, umfangreiches Ergänzungskapitel hinzugefügt, das die stürmische Entwicklung der Relativiatätstheorie bis hin zu unseren Tagen nachzeichnet. Eingegangen wird auf Gravitationswellen und Schwarze Löcher, auf neuere Entwicklungen der Kosmologie, auf Ansätze zu einer Theorie der Quantengravitation und auf die zahlreichen raffinierten (...) Experimente, welche die Gültigkeit der Einsteinschen Theorie mit immer größerer Genauigkeit bestätigt haben. Damit bleibt dieses Buch nach wie vor einer der unmittelbarsten Zugänge zur Relativitätstheorie für alle die sich für eine über das rein populärwissenschaftliche hinausgehende Einführung interessieren. (shrink)

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain (...) in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant. (shrink)