The goal of this thesis is to model some of the cognitive structures and processes involve d in how people decide what to say in purposeful conversation. The main concern is to show how a speaker's knowledge of his/her hearer influences what s/he says. Utterances in such dialogues, where speakers can be presumed to be speaking for reasons, can best be viewed as the performance of "speech acts" (e.g., requesting). By modeling the process of deciding what to say as one (...) of problem-solving, we show that the same mechanisms used to plan non-linguistic actions are applicable to planning of speech acts. The methodology of this research employs a computer program that integrates beliefs, goals, problem-solving, and reasoning, with the use of language. The program does this by planning speech acts when it determines that to achieve its situational goals, it needs to influence someone else's behavior. The system is able to plan request speech actrions to influence its user's goals, and inform speech acts to influence his/her beliefs. In addition, it is shown that speech acts can be used to achieve subgoals of other such acts. For instance, in addition to requesting that the user perform some action, the system can also decide to supply him/her with information necessary to performing that action -- information that it believes s/he does not already have. Our model is extendable to the more general problem of planning multiparty speech acts -- ones where actions requested by the speaker involve acts to be performed by parties other than the hearer. [MORE]. (shrink)

This paper explores the truism that people think about what they say. It proposes that, to satisfy their own goals, people often plan their speech acts to affect their listeners' beliefs, goals, and emotional states. Such language use can be modelled by viewing speech acts as operators in a planning system, thus allowing both physical and speech acts to be integrated into plans. Methodological issues of how speech acts should be defined in a planbased theory are illustrated by defining operators (...) for requesting and informing. Plans containing those operators are presented and comparisons are drawn with Searle's formulation. The operators are shown to be inadequate since they cannot be composed to form questions (requests to inform) and multiparty requests (requests to request). By refining the operator definitions and by identifying some of the side effects of requesting, compositional adequacy is achieved.The solution leads to a metatheoretical principle for modelling speech acts as planning operators. (shrink)

At the 1969 annual meeting of the American Association for the Ad vancement ofScience, held in Boston on December 27-29, a sequence of symposia on the philosophical foundations of science was organized jointly by Section L of the Association and the Boston Colloquium for the Philosophy of Science. Section L is devoted to the history, philos ophy, logic and sociology of science, with broad connotations extended both to 'science' and to 'philosophy'. With collaboration generously extended by other and more specialized (...) Sections of the AAAS, the Section L program took an unusually rich range of topics, and indeed the audiences were large, and the discussions lively. This book, regrettably delayed in publication, contains the major papers from those symposia of 1969. In addition, it contains the distin guished George Sarton Memorial Lecture of that meeting, 'Boltzmann, Monocycles and Mechanical Explanation' by Martin J. Klein. Some additions and omissions should be noted: In Part 1, dedicated to the 450th anniversary of the birth of Leonardo da Vinci, we have been una bie to include a contrihution by Elmer Belt who was prevented by storms from participating. In Part II, on physics and the explanation of life, we were unable to persuade Isaac Asimov to overcome his modesty about the historical remarks he made under the title 'Arrhenius Revisited'. (shrink)

We review how leaky competing accumulators (LCAs) can be used to model decision making in two‐alternative, forced‐choice tasks, and we show how they reduce to drift diffusion (DD) processes in special cases. As continuum limits of the sequential probability ratio test, DD processes are optimal in producing decisions of specified accuracy in the shortest possible time. Furthermore, the DD model can be used to derive a speed–accuracy trade‐off that optimizes reward rate for a restricted class of two alternative forced‐choice decision (...) tasks. We review findings that compare human performance with this benchmark, and we reveal both approximations to and deviations from optimality. We then discuss three potential sources of deviations from optimality at the psychological level—avoidance of errors, poor time estimation, and minimization of the cost of control—and review recent theoretical and empirical findings that address these possibilities. We also discuss the role of cognitive control in changing environments and in modulating exploitation and exploration. Finally, we consider physiological factors in which nonlinear dynamics may also contribute to deviations from optimality. (shrink)

This paper explores principles governing the rational balance among an agent's beliefs, goals, actions, and intentions. Such principles provide specifications for artificial agents, and approximate a theory of human action (as philosophers use the term). By making explicit the conditions under which an agent can drop his goals, i.e., by specifying how the agent is committed to his goals, the formalism captures a number of important properties of intention. Specifically, the formalism provides analyses for Bratman's three characteristic functional roles played (...) by intentions [7, 9], and shows how agents can avoid intending all the foreseen side-effects of what they actually intend. Finally, the analysis shows how intentions can be adopted relative to a background of relevant beliefs and other intentions or goals. By relativizing one agent's intentions in terms of beliefs about another agent's intentions (or beliefs'), we derive a preliminary account of interpersonal commitments. (shrink)

This book presents views of the concept of intention and its relationship to communication from three perspectives: philosphy, linguistics, and artificial intelligence. The book is a record of a workshop held in 1987.

What is involved when a group of agents decide to do something together? Joint action by a team appears to involve more than just the union of simultaneous individual actions, even when those actions are coordinated. We would not say that there is any teamwork involved in ordinary automobile traffic, even though the drivers act simultaneously and are coordinated (one hopes) by the traffic signs and rules of the road. But when a group of drivers decide to do something together, (...) such as driving somewhere as a convoy, it appears that the group acts more like a single agent with beliefs, goals, and intentions of its own, over and above the individual ones. [more]. (shrink)

Current understanding of the development of quantity representations is based primarily on performance in the number‐line task. We posit that the data from number‐line tasks reflect the observer's underlying representation of quantity, together with the cognitive strategies and skills required to equate line length and quantity. Here, we specify a unified theory linking the underlying psychological representation of quantity and the associated strategies in four variations of the number‐line task: the production and estimation variations of the bounded and unbounded number‐line (...) tasks. Comparison of performance in the bounded and unbounded number‐line tasks provides a unique and direct way to assess the role of strategy in number‐line completion. Each task produces a distinct pattern of data, yet each pattern is hypothesized to arise, at least in part, from the same underlying psychological representation of quantity. Our model predicts that the estimated biases from each task should be equivalent if the different completion strategies are modeled appropriately and no other influences are at play. We test this equivalence hypothesis in two experiments. The data reveal all variations of the number‐line task produce equivalent biases except for one: the estimation variation of the bounded number‐line task. We discuss the important implications of these findings. (shrink)

The interconversion of key regulatory proteins between phosphorylated and dephosphorylated forms is an extremely versatile mechanism for reversible altering their activities, and in mammalian cells may be almost as common as allosteric regulation. It is now evident that protein phosphorylation is the basis of a complex network of interlocking systems which allow a variety of hormones and other extracellular signals, acting through just a few second messengers to coordinate biochemical functions.

This collection explores the meaning of maps and of map-making in the modern world.

These essays deal with the scholarly study of the genesis, transmission, and editorial reconstitution of texts by exploring the connections between textual instability and textual theory, interpretation, and pedagogy. What makes this collection unique is that each essay brings a different theoretical orientation-New Historicism, Poststructuralism, or Feminism-to bear upon a different text, such as Whitman's Leaves of Grass , Faulkner's The Sound and the Fury, or hypertext fiction, to explore the dialectical relationship between texts and textuality. The essays bring some (...) of the textual theories that compete with each other today into contact with a broad range of primarily literary textual histories. That texts are intrinsically unstable, frequently consisting of a series of determinate historical versions, has consequences for all students of literature, because different versions of a literary work frequently help shape different readings independently of the interpretations brought to bear upon them. Textual instability of the works is relevant to our understanding of how the meanings of texts are generated. The contributors build on the numerous challenges to the Anglo-American editorial tradition mounted during the past decade by scholars as diverse as Jerome McGann, D.F. McKenzie, Peter Shillingsburg, D.C. Greetham, Hershel Parker, and Hans Walter Gabler. The volume contributes to the paradigm shift in textual scholarship inaugurated by these scholars. Index. (shrink)

Using data from the 1993 Consumer Expenditure Survey to examine housework-related service consumption, the author finds that spending on housekeeping services and meals out—which helps relieve women's housework burden—is affected by dynamics within marriages as well as by family class and race-ethnicity. Other things equal, families in which women have more relative power, as reflected in their income and occupational status, consume more housekeeping services and spend more of their food dollars on meals out, as do wealthier families and white (...) families. Along with housework itself, which is well studied, these results suggest that housework service consumption is also an arena for gendered negotiation and conflict within families, and one way that gender relations vary by class and race-ethnicity. (shrink)

This article explores the effect of women’s movement into the labor market on the gender segregation of work, using the Current Population Survey from 1972 to 1993. The author includes as working those respondents who were “keeping house” and codes keeping house as an occupation. The results show higher estimates of gender segregation, and slightly steeper declines over time, than were seen in previous studies. Analysis of one-year longitudinal changes reveals less movement out of female-dominated occupations when keeping house is (...) included as an occupation. Finally, a decomposition of the segregation trend shows that the movement of women away from keeping house contributed as much to the overall decline in gender segregation as did the desegregation of paid occupations. The author concludes that the movement of women’s work from the household to the labor market has been a driving force in the changing nature of gender inequality. (shrink)

The continuing spread and development of electronic data interchange in health care settings is fuelling a significant global debate about the practicality, ethics, and legality of such a practice. The uncertainties implicit in this debate are particularly acute in the context of disease or population groups for whom multidisciplinary, multipleagency teamworking has become acknowledged as the “best practice” for providing effective and timely care or support. The greying of the population is a demographic phenomenon that will have a profound impact (...) on the health care system, social care agencies, and caregivers, and will require a greater degree of service coordination in order to meet the complex care needs of both care-receiver and caregiver. (shrink)

The continuing spread and development of electronic data interchange in health care settings is fuelling a significant global debate about the practicality, ethics, and legality of such a practice. The uncertainties implicit in this debate are particularly acute in the context of disease or population groups for whom multidisciplinary, multipleagency teamworking has become acknowledged as the “best practice” for providing effective and timely care or support. The greying of the population is a demographic phenomenon that will have a profound impact (...) on the health care system, social care agencies, and caregivers, and will require a greater degree of service coordination in order to meet the complex care needs of both care-receiver and caregiver. (shrink)

History and Identity in the Late Antique Near East. Edited by Philip Wood. Oxford Studies in Late Antiquity. Oxford: Oxoford University Press, 2013. Pp. xxiii + 237, map. $82.

For fans of Charles Duhigg, Philip Tetlock and Nate Silver, a brilliant and buoyant investigation into the existence (or not) of streaks, from a rising star at the Wall Street Journal.

An exploration of mathematical style through 99 different proofs of the same theorem This book offers a multifaceted perspective on mathematics by demonstrating 99 different proofs of the same theorem. Each chapter solves an otherwise unremarkable equation in distinct historical, formal, and imaginative styles that range from Medieval, Topological, and Doggerel to Chromatic, Electrostatic, and Psychedelic. With a rare blend of humor and scholarly aplomb, Philip Ording weaves these variations into an accessible and wide-ranging narrative on the nature and (...) practice of mathematics. Inspired by the experiments of the Paris-based writing group known as the Oulipo—whose members included Raymond Queneau, Italo Calvino, and Marcel Duchamp—Ording explores new ways to examine the aesthetic possibilities of mathematical activity. 99 Variations on a Proof is a mathematical take on Queneau’s Exercises in Style, a collection of 99 retellings of the same story, and it draws unexpected connections to everything from mysticism and technology to architecture and sign language. Through diagrams, found material, and other imagery, Ording illustrates the flexibility and creative potential of mathematics despite its reputation for precision and rigor. Readers will gain not only a bird’s-eye view of the discipline and its major branches but also new insights into its historical, philosophical, and cultural nuances. Readers, no matter their level of expertise, will discover in these proofs and accompanying commentary surprising new aspects of the mathematical landscape. (shrink)

In a recent discussion of Amartya Sen's concept of the capabilities of people for functioning in their society – and the idea of targeting people's functioning capabilities in evaluating the society – G. A. Cohen accuses Sen of espousing an inappropriate, ‘athletic’ image of the person (Cohen, 1993, pp. 24–5). The idea is that if Sen's formulations are to be taken at face value, then life is valuable only so far as people actively choose most facets of their (...) existence: if they fare well in the material stakes, for example, they must fare well as a result of active choice and effort, not because anyone else looks after them. ‘That’, says Cohen, ‘overestimates the place of freedom and activity in well-being’ (p. 25). (shrink)