We present an account of processing capacity in the ACT-R theory. At the symbolic level, the number of chunks in the current goal provides a measure of relational complexity. At the subsymbolic level, limits on spreading activation, measured by the attentional parameter W, provide a theory of processing capacity, which has been applied to performance, learning, and individual differences data.

Cognitive architectures have often been applied to data from individual experiments. In this paper, I develop an ACT-R reader that can model a much larger set of data, eye-tracking corpus data. It is shown that the resulting model has a good fit to the data for the considered low-level processes. Unlike previous related works, the model achieves the fit by estimating free parameters of ACT-R using Bayesian estimation and Markov-Chain Monte Carlo techniques, rather than by relying on the mix of (...) manual selection + default values. The method used in the paper is generalizable beyond this particular model and data set and could be used on other ACT-R models. (shrink)

The target article is based upon the principle that complex mental phenomena result from the interactions among some elementary entities. Connectionist nodes and ACT-R's production rules can be considered as such entities. However, before testing against Newell's macro-criteria, self-organizing models must be tested against criteria relating to the properties of their elementary entities. When such micro-criteria are considered, they separate connectionism from ACT-R and the comparison of these theories against Newell's Tests is hardly correct.

The difficulty in discovering a difference between killing and letting die has led many philosophers to deny the distinction. This paper seeks to develop an argument defending the distinction between killing and letting die. In relation to Rachels’ cases, the argument is that (a) even accepting that Smith and Jones may select equally heinous options from the choices they have available to them, (b) the fact that the choices available to them are different is morally relevant, and (c) this difference (...) in available choices can be used to distinguish between the agents in certain circumstances. It is the principle of justice, as espoused by Aristotle, which requires that equal things are treated equally and that unequal things are treated unequally that creates a presumption that Smith and Jones should be treated differently. The magnitude of this difference can be amplified by other premises, making the distinction morally relevant in practical reality. (shrink)

Model validation in computational cognitive psychology often relies on methods drawn from the testing of theories in experimental physics. However, applications of these methods to computational models in typical cognitive experiments can hide multiple, plausible sources of variation arising from human participants and from stochastic cognitive theories, encouraging a “model fixed, data variable” paradigm that makes it difficult to interpret model predictions and to account for individual differences. This article proposes a likelihood‐based, “data fixed, model variable” paradigm in which models (...) are treated as stochastic processes in experiments with participant‐to‐participant variation that can be applied to a broad range of mechanistic cognitive architectures. This article discusses the implementation and implications of this view in model validation, with a concrete focus on a simple class of ACT‐R models of cognition. This article is not intended as a recipe for broad application of these preliminary, proof‐of‐concept methods, but as a framework for communication between statisticians searching for interesting problems in the cognitive modeling sphere, and cognitive modelers interested in generalizing from deterministic to stochastic model validation, in the face of random variation in human experimental data. (shrink)

The Human Fertilisation and Embryology Authority’s recent restrictive recommendations on sex selection have highlighted the need for consideration of the plausibility of ethical arguments against sex selection. In this paper, the author suggests a parental virtues approach to some questions of reproductive ethics as a superior alternative to an exclusively harm focused approach such as the procreative liberty framework. The author formulates a virtue ethics argument against sex selection based on the idea that acceptance is a character trait of the (...) good parent. It is concluded that, because the argument presented posits a wrong in the sex selecting agent’s action that is not a harm, the argument could not function as a justification of the HFEA’s restrictive position in light of their explicit commitment to procreative liberty; it does, however, suggest that ethical approaches focused exclusively on harm fail to capture all the relevant moral considerations and thus that we should look beyond such approaches. (shrink)

The theme of _Signifying Acts _is that social acts are created by human agents engaging in signifying gestures and elic­iting determined responses—from which flow a number of consequences. This theme is developed by a critical synthesis of various strands of early and contemporary thought in symbolism, meaning, language, and grammar. These strands have been classified as pragma­tism and interactionism, structuralism and grammatical theory Perinbanayagam brings together for the first time the writings of G. H. Mead and his followers, who label (...) their efforts “symbolic interactionism,” and the re­cent developments in the philosophi­cal and anthropological studies of mind and meaning. Through his wide-ranging analysis, he demonstrates the sociologi­cal relevance of Chomsky, Derrida, and Searle and particularizes their contribu­tions to a more comprehensive theoreti­cal framework. The interdisciplinary scope of his thesis recalls Ernest Becker’s _Birth and Death of Meaning, _and his sty­listic flair will stimulate readers at all levels of sophistication. (shrink)

Interpreters of Acts face three recurrent questions: 1) What is its genre? 2) Why was it written? and 3) How is Scripture used? In deciding genre, readers must decide if Acts is history, and, if so, in what sense. Determining its literary or theological purpose can be done in terms of asking what Acts accomplishes.

Understanding what it means toconsent is of considerable importance sincesignificant moral issues depend on how this actis defined. For instance, determining whetherconsent has occurred is the deciding factor insexual assault cases; its proper occurrence isa necessary condition for federally fundedhuman subject research. Even though mosttheorists recognize the legal and moralimportance of consent, there is still littleagreement concerning how consent should bedefined, or whether different domains involvingconsent demand context-specific definitions.Understanding what it means to consent isfurther complicated by the fact that currentlegal (...) conceptions are not necessarily groundedin argument; they typically depend on appealsto authority and precedent. The purpose ofthis paper is to use speech act theory toprovide a theoretically grounded conception ofconsent; such a conception can aid in the justresolution of legal and moral disputes thathinge on whether an act of consent occurred. (shrink)

The first issue concerns what can be meant by the "newness" or "originality" which Koestler attributes to the products of creative acts. One of the purposes of this paper will be to discriminate several distinct but incompatible meanings which Koestler associates with the newness in created objects. The second issue concerns whether Koestler's thesis commits him to a form of determinism or indeterminism with respect to human creative activity. The third issue raises the question whether his thesis is intended as (...) an explanatory hypothesis or as an elaborate description of common features in creative activities. This question, of course, relates directly to the initial query about the standards of understanding which are appropriate to creative acts. And it points to the last issue which concerns the metaphysical implications of the thesis. It will be my aim to argue that a development of the metaphysics implicit in the thesis would provide a more comprehensive theory that could meet at least some of the difficulties the theory raises. (shrink)

Supererogation has gained attention as a means of explaining the voluntary behaviours of individuals and organizations that are done for the benefit of others and which go above what is required of legislation and what may be expected by society. Whilst the emerging literature has made some significant headway in exploring supererogation as an ethical lens for the study of business there remain several important issues that require attention. These comprise, the lack of primary evidence upon which such examinations have (...) been made, attention has been given to only singular pro-social acts of organizations, and the focus has been upon the actions of large organizations. Furthermore, Heyd’s (Supererogation, Cambridge University Press, 1982) original taxonomy of six supererogatory acts, comprising Moral Heroism, Beneficence, Volunteering, Favour, Forgiveness and Forbearance, has been considered to be complete and other forms of supererogatory acts have not yet been explored. In order to address these gaps this study poses the research questions: First, it studies how a single, contemporary SME performs multiple supererogatory acts in its attempts to address its social and environmental goals that go beyond CSR. Second, it seeks to gain a deeper theoretical understanding of Heyd’s (Supererogation, Cambridge University Press, 1982) taxonomy of six forms of supererogation through the capture of primary data. This research makes a three-year case study examination of a single SME that has been formally recognized for its work in addressing social and environmental issues at local, national and global levels. Primary data are acquired of the supererogatory acts that it performs through a three-year participant observation case study, utilizing 61 interviews and 3 focus groups with internal and external stakeholders. In doing so, it addresses the empirical limitations of the extant research, substantiates each of the forms that supererogatory acts may take, and makes a contribution to the theory of supererogation by identifying a further class of act that is ‘Sharing’. (shrink)

This article investigates the potential of fMRI to test assumptions about different components in models of complex cognitive tasks. If the components of a model can be associated with specific brain regions, one can make predictions for the temporal course of the BOLD response in these regions. An event‐locked procedure is described for dealing with temporal variability and bringing model runs and individual data trials into alignment. Statistical methods for testing the model are described that deal with the scan‐to‐scan correlations (...) in the errors of measurement of the BOLD signal. This approach is illustrated using a “sacrificial” ACT‐R model that involves mapping 6 modules onto 6 brain regions in an experiment from concerned with equation solving. The model's visual encoding predicted the BOLD response in the fusiform gyrus, its controlled retrieval predicted the BOLD response in the lateral inferior prefrontal cortex, and its subgoal setting predicted the BOLD response in the anterior cingulate cortex. On the other hand, its motor programming failed to predict anticipatory activation in the motor cortex, its representational changes failed to predicted the pattern of activity in the posterior parietal cortex, and its procedural component failed to predict an initial spike in caudate. The results illustrate the power of such data to direct the development of a theory of complex problem solving, both at the level of a specific task model as well as at the level of the cognitive architecture. (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)

This study analyzes cognitive responses to explore a dual processing perspective of ethical judgment formation. Specifically, the study investigates how two factors, judgment task difficulty and moral intensity, influence the extent of deontological and teleological processing and their effects on ethical judgments. A single experiment on 110 undergraduate research participants found that judgment task difficulty affected the extent of deontological and teleological processing. Although moral intensity affected ethical judgments, it did not produce effects on either deontological or teleological cognitive responses. (...) Results did not support the hypotheses that deontological and teleological cognitive responses would mediate the relationships between the experimental factors and ethical judgments. Overall, the results support continued research of factors that affect the nature of information processing in ethical decision situations and the use of cognitive response analysis as a tool for conducting this research. (shrink)

The parameters governing our behavior are in constant flux, and capturing these dynamics in cognitive models remains a challenge. We demonstrate how a mapping between ACT‐R's model of declarative memory and the linear ballistic accumulator enables efficient estimation of memory parameters from data. The resulting estimates provide a cognitively meaningful explanation for observed differences in behavior over time and between individuals.

The U.S. Supreme Court has likely already decided how much, if any, of President Obama's signature Affordable Care Act it is going to strike down as unconstitutional; its holding will be published this summer. No matter what the Court decides, though, it will send state and federal legislators scrambling—either to implement the law or to deal with the consequences of its alteration. There are various decisions the Court might make, but it is still most apt either to leave the ACA (...) standing, or to selectively invalidate some of its mandate‐related provisions. In either case, there will be exchanges to design and manage, subsidies to allocate, transparency standards to design and enforce. The Court's decision will thus mark the beginning, not the end, of health reform. (shrink)

In this article, we critically scrutinize the principle of proportionality when used in the context of security and government surveillance. We argue that McMahan’s distinction from just warfare between narrow proportionality and wide proportionality can generally apply to the context of surveillance. We argue that narrow proportionality applies more or less directly to cases in which the surveilled is liable and that the wide proportionality principle applies to cases characterized by ‘collateral intrusion’. We argue, however, that a more demanding criterion (...) than the lesser-evil justification that wide proportionality frequently entails is necessary in cases characterized by intentional intrusion upon non-liable individuals. The distinction between foreseeing and intending intrusion into the lives of individuals who are not liable has not previously been specifically addressed in discussions concerning surveillance ethics. This specification is thus increasingly important due to the general growing tendency for adherence to the precautionary principle and policies aimed at anticipating criminal acts before they are committed. Preventive surveillance of non-liable actors is considered an important instrument for obtaining this aim and thus calls for moral scrutiny in terms of permissibility and proportionality. We suggest the concept ‘wide proportionality +’ which applies to cases of intentional intrusion of non-liable individuals. (shrink)

Translated from the Italian, this work forms part of the author's La philosophie de l'intégralité; it deals dialectically with the essence of being and with existence and reality, throwing interesting light on values, love, and morality. A long appendix presents some critical reflexions on Gentile's "Actualism."--R. D. G.

A frequent objection to act-Utilitarianism is that, Because the consequences of acts extend indefinitely into the future, I cannot put the theory into practice, By trying to decide on its basis what it would be right to do in this case. I reinforce this unworkability argument with an argument designed to show that our ignorance of acts' total actual consequences, At least in the case of a great many acts, Stems not merely from remoteness in the causal and/or temporal orders (...) but also from the "kinds" of consequences which go to comprise acts' total actual consequences. (shrink)

With what view of consequences shall we equip an act-Utilitarianism? I distinguish a broad view of consequences, According to which a consequence is any subsequent future state of the world caused or brought about by an act, Whether by the act alone or by it together with other concurrent happenings, Including the acts of other agents, From a narrow view, According to which a future state of the world is a consequence of an act only if that state would occur (...) if the act were performed and would not occur if any alternative act were performed. I suggest that the narrow view leads to counterintuitive results. (shrink)

When viewed the history of Islamic thought, it is seen that the scholars have made an effort to understand the nature of the speech of God and make sense of it. Essentially, understanding and grasping of the words of God are an effort to look from the physical realm to the metaphysical one. In spite of this fact, the scholars as the indomitable seekers of truth are in search of finding some clues to say about it. While some of them (...) consider the “divine speech” as an attribute of God, many others view it as a divine act. It is also admitted by all of them that whether being attributive or act of God, the reflection of the divine speech is the Qur’ân. In this sense, three views have been put forward on the question of the belonging of the Qur’ânic words. According to the dominant and preferred point of view among these views, Qur’ân belongs to God in terms of wording and meaning. Accordingly, the revelation of the Qur’ân, which was revealed to the Prophet Mohammed consists of both wording and meaning. Therefore, there is no intervention or contribution of Gabriel or Muhammad in constituting of Qur’ân. According to the second approach, the meaning of Qur’ânic text belongs to God, however, its words pertain to Mohammed. This view signals that Gabriel revealed nothing more than the meanings of Qur’ân. Mohammed understands the meanings conveyed to him and then said them in Arabic expression patterns and phrases. According to the third approach, the meanings of Qur’ânic text belongs to God, however, its words pertain to Gabriel. In other words, only meanings of text were given to Gabriel, and its words are formed by him. In the present study, the mentioned approaches which are put forward by scholars about the belonging of Qur’ânic words will be examined in terms of the integrity of the Qur’ân and Tafsir rumors (riwâyât) of the classical period. In a nutshell, it can be said that there is no disagreement among scholars in the field of the belonging of the meanings of Qur’ânic text to God. The main disagreement is whether the Qur’ânic words belong to God, Gabriel or Muhammad. Considering the integrity of Qur’ân and Tafsir rumors regarding to the circumstances of sending down of the Qur’ânic revelation, it has been determined that the prevailing view is more consistent than the other two views. (shrink)

In this analysis, I employ Husserl’s three-part description of intentionality to show how a player/play act/play object model for consciousness helps us see play more clearly. I review Suits’ logic-based attempts to amend Huizinga’s overly inclusive characterization of play. However, I do so on what I see as stronger phenomenological grounds by describing four kinds of experience embedded in Suits’ work-play dichotomy. I analyze two species of play-fortified work – namely, work that requires intrinsic enhancement and work that does not. (...) I also describe two species of play – namely, play that is compromised and play that is unfettered. I conclude by summarizing advantages of phenomenological analyses and underlining the important distinctions this philosophic method uncovers within traditional work and play categories. (shrink)