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.

Since the passage of Medicare, the self-regulation characteristic of professionalism in health care has come under steady assault. While Canadian physicians chose to relinquish financial autonomy, they have enjoyed far greater professional autonomy over their medical judgments than their U.S. counterparts who increasingly have their practices micromanaged. The Affordable Care Act illustrates the ways that managerial strategies and a market model of health care have shaped the financing and delivery of health care in the U.S., often with little or no (...) evidence of their effectiveness. (shrink)

This essay describes how longstanding conceptions of professionalism in American medical care came under attack in the decades since the enactment of Medicare in 1965 and how the reform strategy and core provisions of the 2010 Affordable Care Act illustrate the weakening of those ideas and the institutional practices embodying them.The opening identifies the dominant role of physicians in American medical care in the two decades after World War II. By the time Medicare was enacted in 1965, associations of American (...) physicians were almost completely in charge of medical education, specialist certification, and the enforcement of professional norms on their members. Who could be a doctor, what education and training would be required, and what collegial oversight was operative was first a professional matter and only secondly implicated the state through malpractice or major corporations via the employment of physicians. (shrink)

Practical reason is the general human capacity for resolving, through reflection, the question of what one is to do. Deliberation of this kind is practical in at least two senses. First, it is practical in its subject matter, insofar as it is concerned with action. But it is also practical in its consequences or its issue, insofar as reflection about action itself directly moves people to act. Our capacity for deliberative self-determination raises two sets of philosophical problems. First, there are (...) questions about how deliberation can succeed in being practical in its issue. What do we need to assume — both about agents and about the processes of reasoning they engage in — to make sense of the fact that deliberative reflection can directly give rise to action? Can we do justice to this dimension of practical reason while preserving the idea that practical deliberation is genuinely a form of reasoning? Second, there are large issues concerning the content of the standards that are brought to bear in practical reasoning. Which norms for the assessment of action are binding on us as agents? Do these norms provide resources for critical reflection about our ends, or are they exclusively instrumental? Under what conditions do moral norms yield valid standards for reasoning about action? The first set of issues is addressed in sections 1-3 of the present article, while sections 4-5 cover the second set of issues. (shrink)

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)

Understanding what it means to consent is of considerable importance since significant moral issues depend on how this act is defined. For instance, determining whether consent has occurred is the deciding factor in sexual assault cases; its proper occurrence is a necessary condition for federally funded human subject research. Even though most theorists recognize the legal and moral importance of consent, there is still little agreement concerning how consent should be defined, or whether different domains involving consent demand context-specific definitions. (...) Understanding what it means to consent is further complicated by the fact that current legal conceptions are not necessarily grounded in argument; they typically depend on appeals to authority and precedent. The purpose of this paper is to use speech act theory to provide a theoretically grounded conception of consent; such a conception can aid in the just resolution of legal and moral disputes that hinge on whether an act of consent occurred. (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.

For quite some time now philosophers have stressed the need to distinguish between explanatory (motivating) reasons and justifying (good) reasons. The distinction is often illustrated with an example of someone doing something that is intended to strike the reader or listener, at least at the outset, as incomprehensible. The story of Abraham on Mount Moriah, who decided to sacrifice his son, Isaac, illustrates this pattern. Killing one’s own child is a horrific thing to do, and it is hard to understand (...) what would drive a parent to do such a thing. But once we are informed that Abraham actually believed God had told him to do so, we can see (allegedly) that there is at least an explanation of why he decided to kill his son. In the eyes of most people the planned act remains awful. But once we assume that Abraham was mistaken (say, because the best explanation in this case need not postulate the existence of God), we can see that his decision to kill his son is not a response to a normative good reason.1 So in a few lines we have outlined two reason notions: explanatory and normative (good) reasons. Cases like this afford an intuitive grasp of the distinction between explanatory and normative reasons — the difference between what explains Abraham’s motivation and behaviour and the good or bad reasons that apply to him. However, more recently (see e.g. Dancy 2000) the picture such cases present has been supplemented, or perhaps even corrected. There is a further feature of the Abrahamic story that needs to be teased out — one that gives a finer-grained understanding of what is going on than that provided by talk of the agent’s explanatory reasons. I share this view, and so what I will be doing in this paper is mainly to underline the need to dig a bit deeper. Motivation, as I shall argue, comes in different forms . (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)

It is both common and natural to think of addiction as a kind of defect of the will. Addicts, we tend to suppose, are subject to impulses or cravings that are peculiarly unresponsive to their evaluative reflection about what there is reason for them to do. As a result of this unresponsiveness, we further suppose, addicts are typically impaired in their ability to act in accordance with their own deliberative conclusions. My question in this paper is whether we can make (...) adequate sense of this conception of addiction as a volitional defect. In particular, I want to focus on some philosophical assumptions, from the theory of action, that bear directly on the very idea that addiction might impair the agent’s volitional capacities. Understanding this idea, I shall argue, requires that we start out with an adequate conception of the human will. Only if we appreciate the kinds of volitional capacities characteristic of normal agents can we conceptualize properly the impairment of those capacities represented by addiction, and assess the implications of such impairment for questions of responsibility. (shrink)

Trope theory is a leading metaphysical theory in analytic ontology. One of its classic statements is found in the work of Donald C. Williams who argued that tropes qua abstract particulars are the very alphabet of being. The concept of an abstract particular has been repeatedly attacked in the literature. Opponents and proponents of trope theory alike have levelled their criticisms at the abstractness of tropes and the associated act of abstraction. In this paper I defend the concept of a (...) trope qua abstract particular by rejecting arguments that purport to show that tropes should not be understood as abstract and by arguing that the abstractness of tropes plays an indispensable role in one of our more promising trope-theoretic analyses of universals and of concrete objects. (shrink)

This paper explores the question whether utilitarianism is compatible with the autonomy of the moral agent. The paper begins by considering Bernard Williams' famous complaint that utilitarianism cannot do justice to the personal projects and commitments constitutive of character. Recent work (by Peter Railton among others) has established that a utilitarian agent need not be free of such personal projects and commitments, and could even affirm them morally at the level of second"order reflection. But a different and more subtle problem (...) confronts this approach: the use of utilitarian principles to justify the cultivation of personal projects and attachments undermines the autonomy to support this objection, according to which autonomy is a matter of acting in a way one can reflectively endorse. (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)

Rational agency may be thought of as intentional activity that is guided by the agent's conception of what they have reason to do. The paper identifies and assesses three approaches to this phenomenon, which I call internalism, meta-internalism, and volitionalism. Internalism accounts for rational motivation by appeal to substantive desires of the agent's that are conceived as merely given; I argue that it fails to do full justice to the phenomenon of guidance by one's conception of one's reasons. Meta-internalism explains (...) this phenomenon by postulating higher-order dispositions, consitutive of (rational) agency itself, which causally interact with the agent's normative beliefs to produce corresponding motivations to action. I show that meta-internalism comes to grief over cases of akrasia, insofar as it leaves no room for the capacity for rational guidance when agents voluntarily act at variance with their judgments about what they have reason to do. Volitionalism, I contend, improves on both internalism and meta-internalism. Its distinctive feature is the postulation of a kind of motivation that is directly subject to the agent's control, and independent of the dispositions and desires to which the agent is passively subject. (shrink)

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)

An adult university hospital ethics committee evaluated a proposed TA-NRP protocol in the fall of 2018. The protocol raised ethical concerns about violation of the Uniform Determination of Death Act and the prohibition known as the Dead Donor Rule, with potential resultant legal consequences. An additional concern was the potential for increased mistrust by the community of organ donation and transplantation. The ethics committee evaluated the responses to these concerns as unable to surmount the ethical and legal boundaries and the (...) ethics committee declined to endorse the procedure. These concerns endure. (shrink)

The thesis may be expressed as: An agent intentionally A's if and only if she A's for a reason. My aim in this paper is to show that the spirit of the thesis, if not its letter, survives a variety of criticisms and to illuminate, in the process, the nature of reasons for action, acting for reasons, and acting intentionally.

According to T. M. Scanlon's buck‐passing account, the normative realm of reasons is in some sense prior to the domain of value. Intrinsic value is not itself a property that provides us with reasons; rather, to be good is to have some other reason‐giving property, so that facts about intrinsic value amount to facts about how we have reason to act and to respond. The paper offers an interpretation and defense of this approach to the relation between reasons and values. (...) I start by acknowledging the role that substantive values play in specifications of our reasons, noting that this poses an apparent challenge to the buck‐passing account. The challenge can be met, however, if we adopt a deliberative understanding of substantive value, an interpretation that I proceed to develop and defend. In conclusion I consider recent attempts to capture the agent‐relativity of reasons within a teleological framework for thinking about the relation between reasons and values. I argue that these approaches rest on a deliberative understanding of value; the teleological framework thus turns out to illustrate the basic insight of the buck‐passing approach, rather than offering an alternative to it. (shrink)

As this passage from a recent book on the psychology of decision-making indicates, deciding seems to be part of our daily lives. But what is it to decide to do something? It may be true, as some philosophers have claimed, that to decide to A is to perform a mental action of a certain kind – specifically, an action of forming an intention to A. (Henceforth, the verb ‘form’ in this context is to be understood as an action verb.) Even (...) if this is so, we are faced with pressing questions. Do we form all of our intentions? If not, how does forming an intention differ from other ways of acquiring one? Do we ever, in fact, form intentions, or do we rather merely acquire them in something like the way we acquire beliefs or desires? These are some of the questions that will occupy me here. My aim is to clarify the nature of deciding to act and to make a case for the occurrence of genuine acts of intention formation. (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.

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 parameters governing our behavior are in constant flux. Accurately capturing these dynamics in cognitive models poses a challenge to modelers. Here, we demonstrate a mapping of ACT-R's declarative memory onto the linear ballistic accumulator (LBA), a mathematical model describing a competition between evidence accumulation processes. We show that this mapping provides a method for inferring individual ACT-R parameters without requiring the modeler to build and fit an entire ACT-R model. Existing parameter estimation methods for the LBA can be used, (...) instead of the computationally expensive parameter sweeps that are traditionally done. We conduct a parameter recovery study to confirm that the LBA can recover ACT-R parameters from simulated data. Then, as a proof of concept, we use the LBA to estimate ACT-R parameters from an empirical dataset. The resulting parameter estimates provide a cognitively meaningful explanation for observed differences in behavior over time and between individuals. In addition, we find that the mapping between ACT-R and LBA lends a more concrete interpretation to ACT-R's latency factor parameter, namely as a measure of response caution. This work contributes to a growing movement towards integrating formal modeling approaches in cognitive science. (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)

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)

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)

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)