It is argued that reliance on the testimony of others cannot be viewed as reliance on a kind of evidence. Speech being essentially voluntary, the speaker cannot see his own choice of words as evidence of their truth, and so cannot honestly offer them to others as such. Rather, in taking responsibility for the truth of what he says, the speaker offers a guarantee or assurance of its truth, and in believing him the hearer accepts this assurance. I argue that, (...) contrary to appearances, this account is compatible with the hearer acquiring knowledge, and in fact throws interesting light on the idea of knowledge. -/- . (shrink)

A critical analysis of Alfred Schuetz' conception of rationality based upon Edmund Husserl's phenomenology.

Parenting our biological children is a centrally important matter, but how, if it all, can it be justified? According to a contemporary influential line of thinking, the acquisition by parents of a moral right to parent their biological children should be grounded by appeal to the value of the intimate emotional relationship that gestation facilitates between a newborn and a gestational procreator. I evaluate two arguments in defence of this proposal and argue that both are unconvincing.

It is argued that to possess the concept of distress is to be able to apply the concept to others, and that this implies a qualified form of altruism, in the sense that to perceive another as being in distress is, other things being equal, to see them as in need of help and be moved to help them.

In Strawson’s “Freedom and Resentment”, the idea of the reactive attitudes is used to provide a corrective for an over-intellectualised picture of moral responsibility and of the moral life generally. But Strawson also tells us that in reasoning with someone our attitude towards them must be reactive. Taking up that thought, I argue that Strawson has also provided us with a corrective for an over-intellectualised picture of rationality. Drawing on a Wittgensteinian conception of the relation between thought and its expression, (...) I argue that rationality presupposes participation in a form of engagement with others that is reactive in Strawson’s sense. I also throw fresh light on what Strawson understands by a reactive attitude. (shrink)

In order to improve our understanding of the components that reflect functionally important processes during reward anticipation and consumption, we used principle components analyses (PCA) to separate and quantify averaged ERP data obtained from each stage of a modified monetary incentive delay (MID) task. Although a small number of recent ERP studies have reported that reward and loss cues potentiate ERPs during anticipation, action preparation, and consummatory stages of reward processing, these findings are inconsistent due to temporal and spatial overlap (...) between the relevant electrophysiological components. Our results show three components following cue presentation are sensitive to incentive cues (N1, P3a, P3b). In contrast to previous research, reward‐related enhancement occurred only in the P3b, with earlier components more sensitive to break‐even and loss cues. During feedback anticipation, we observed a lateralized centroparietal negativity that was sensitive to response hand but not cue type. We also show that use of PCA on ERPs reflecting reward consumption successfully separates the reward positivity from the independently modulated feedback‐P3. Last, we observe for the first time a new reward consumption component: a late negativity distributed over the left frontal pole. This component appears to be sensitive to response hand, especially in the context of monetary gain. These results illustrate that the time course and sensitivities of electrophysiological activity that follows incentive cues do not follow a simple heuristic in which reward incentive cues produce enhanced activity at all stages and substages. (shrink)

It is argued that if, with Dummett, we see assertion as an act governed by conditions of correctness which makes a claim to the effect that these conditions are met, then the conditions of correctness that determine its content must have the impersonal character of a requirement of truth, rather than the speaker-relative character of a requirement of justification or assertibility. For otherwise it would be impossible for different speakers to use the same words to make an assertion with the (...) same content. (shrink)

The institution of the family and its importance have recently received considerable attention from political theorists. Leading views maintain that the institution’s justification is grounded, at least in part, in the non-instrumental value of the parent-child relationship itself. Such views face the challenge of identifying a specific good in the parent-child relationship that can account for how adults acquire parental rights over a particular child—as opposed to general parental rights, which need not warrant a claim to parent one’s biological progeny. (...) I develop a view that meets this challenge. This Project View identifies the pursuit of a parental project as a distinctive non-instrumentally valuable good that provides a justification for the family and whose pursuit is necessary and sufficient for the acquisition of parental rights. This view grounds moral parenthood in a normative relation as opposed to a biological one, supports polyadic forms of parenting, and provides plausible guidance in cases of assisted reproduction. (shrink)

One influential approach seeks to capture the idea of society by characterising social action, or interaction, in terms of the particular kinds of awareness it involves. Another approach focuses on social order, seeing it as a form of order that arises spontaneously when rational and mutually aware individuals succeed in solving co-ordination problems. Yet another approach focuses on the role played by communication in achieving collective agreement on the way the world is to be classified and understood, where this is (...) seen as a pre-condition of co-ordination and co-operation. This encyclopedia entry provides a brief account of each approach and offers an assessment of their stengths and limitations. (shrink)

We propose a ‘Moral Imagination’ methodology to facilitate a culture of responsible innovation for engineering and product teams in technology companies. Our approach has been operationalized over the past two years at Google, where we have conducted over 50 workshops with teams from across the organization. We argue that our approach is a crucial complement to existing formal and informal initiatives for fostering a culture of ethical awareness, deliberation, and decision-making in technology design such as company principles, ethics and privacy (...) review procedures, and compliance controls. We characterize some distinctive benefits of our methodology for the technology sector in particular. (shrink)

As a contribution to a wider discussion on moral discernment in theological anthropology, this paper seeks to answer the question “What is the impact of mental illness on an individual’s ability to make moral decisions?” Written from a clinical psychiatric perspective, it considers recent contributions from psychology, neuropsychology and imaging technology. It notes that the popular conception that mental illness necessarily robs an individual of moral responsibility is largely unfounded. Most people who suffer from mental health problems do not lose (...) the capacity to make moral decisions, and mental illness on its own rarely explains anti-social or criminal behaviour. Moreover, the assumptions of some scientists, that recent developments in neuropsychology and brain imaging suggest biological determinism, must be treated with caution. (shrink)

An extended review essay on Andrew Feenberg's Heidegger and Marcuse that argues that the concept of negation in Hegel is distinct from that in Heidegger which makes such an attempted synthesis problematic.

Distinguishes the concepts of place and locality in Heidegger's late work and argues that there is an emergent distinction which the essay goes on to clarify further.

A philosophical critique of George Grant's use of Heidegger that refers in detail to Reiner Schurmann to distinguish the terms "particularity" and "singularity.".

Why do relationships of friendship and love support partiality, but not relationships of hatred or commitments of racism? Where does partiality end and why? I take the intuitive starting point that important cases of partiality are meaningful. I develop a view whereby meaning is understood in terms of transcending self-limitations in order to connect with things of external value. I then show how this view can be used to distinguish central cases of legitimate partiality from cases of illegitimate partiality and (...) how it puts pressure on the traditional way of thinking about partiality. (shrink)

An increasing number of regulations propose the notion of ‘AI audits’ as an enforcement mechanism for achieving transparency and accountability for artificial intelligence (AI) systems. Despite some converging norms around various forms of AI auditing, auditing for the purpose of compliance and assurance currently have little to no agreed upon practices, procedures, taxonomies, and standards. We propose the ‘criterion audit’ as an operationalizable compliance and assurance external audit framework. We model elements of this approach after financial auditing practices, and argue (...) that AI audits should similarly provide assurance to their stakeholders about AI organizations’ ability to govern their algorithms in ways that mitigate harms and uphold human values. We discuss the necessary conditions for the criterion audit, and provide a procedural blueprint for performing an audit engagement in practice. We illustrate how this framework can be adapted to current regulations by deriving the criteria on which ‘bias audits’ for hiring algorithms can be performed, as required by the recently effective New York City Local Law 144 of 2021. We conclude by offering critical discussion on the benefits, inherent limitations, and implementation challenges of applying practices of the more mature financial auditing industry to AI auditing where robust guardrails against quality assurance issues are only starting to emerge. Our discussion as informed by experiences in performing these audits in practice highlights the critical role that an audit ecosystem plays in ensuring the effectiveness of such methodology. (shrink)

Existing discussions of partiality have primarily examined special personal relationships between family, friends, or co-nationals. The negative analogue of such relationships – for example, the relationship of enmity – has, by contrast, been largely neglected. This chapter explores this adverse relation in more detail and considers the special reasons generated by it. We suggest that enmity can involve justified negative partiality, allowing members to give less consideration to each other’s interests. We then consider whether the negative partiality of enmity can (...) be justified through projects or the value inherent in the relationship, following two influential views about the justification of positive partiality. We argue that both accounts of partiality can be conceptually extended to the negative analogue, but doing so brings into focus the problems with such accounts of the grounds of partiality. (shrink)

Digital duplicates reduce the scarcity of individuals and thus may impact their instrumental and intrinsic value. I here expand upon this idea by introducing the notion of collective scarcity, which pertains to the limitations faced by social groups in maintaining their size, cohesion, and function.

We argue for asymmetries between positive and negative partiality. Specifically, we defend four claims: i) there are forms of negative partiality that do not have positive counterparts; ii) the directionality of personal relationships has distinct effects on positive and negative partiality; iii) the extent of the interactions within a relationship affects positive and negative partiality differently; and iv) positive and negative partiality have different scope restrictions. We argue that these asymmetries point to a more fundamental moral principle, which we call (...) Morality’s Harmonious Propensity. According to this principle, morality has a propensity toward preserving positive relationships and dissolving negative ones. (shrink)

Partiality is the special concern that we display for ourselves and other people with whom we stand in some special personal relationship. It is a central theme in moral philosophy, both ancient and modern. Questions about the justification of partiality arise in the context of enquiry into several moral topics, including the good life and the role in it of our personal commitments; the demands of impartial morality, equality, and other moral ideals; and commonsense ideas about supererogation. This paper provides (...) an overview of the debate on the ethics of partiality through the lens of the domains of permissible and required partiality. After outlining the conceptual space, I first discuss agent-centred moral options that concern permissions not to do what would be impartially optimal. I then focus on required partiality, which concerns associative duties that go beyond our general duties to others and require us to give special priority to people who are close to us. I discuss some notable features of associative duties and the two main objections that have been raised against them: the Voluntarist and the Distributive objections. I then turn to the justification of partiality, focusing on underivative approaches and reasons-based frameworks. I discuss the reductionism and non-reductionism debate: the question whether partiality is derivative or fundamental. I survey arguments for ‘the big three’, according to which partiality is justified by appeal to the special value of either projects, personal relationships, or individuals. I conclude by discussing four newly emerging areas in the debate: normative transitions of various personal relationships, relationships with AI, epistemic partiality, and negative partiality, which concerns the negative analogue of our positive personal relationships. (shrink)

I argue that you can be permitted to discount the interests of your adversaries even though doing so would be impartially suboptimal. This means that, in addition to the kinds of moral options that the literature traditionally recognises, there exist what I call other-sacrificing options. I explore the idea that you cannot discount the interests of your adversaries as much as you can favour the interests of your intimates; if this is correct, then there is an asymmetry between negative partiality (...) toward your adversaries and positive partiality toward your intimates. (shrink)

With the rise and public accessibility of AI-enabled decision-support systems, individuals outsource increasingly more of their decisions, even those that carry ethical dimensions. Considering this trend, scholars have highlighted that uncritical deference to these systems would be problematic and consequently called for investigations of the impact of pertinent technology on humans’ ethical decision-making. To this end, this article conducts a systematic review of existing scholarship and derives an integrated framework that demonstrates how intelligent decision-support systems (IDSSs) shape humans’ ethical decision-making. (...) In particular, we identify resulting consequences on an individual level (i.e., deliberation enhancement, motivation enhancement, autonomy enhancement and action enhancement) and on a societal level (i.e., moral deskilling, restricted moral progress and moral responsibility gaps). We carve out two distinct methods/operation types (i.e., processoriented and outcome-oriented navigation) that decision-support systems can deploy and postulate that these determine to what extent the previously stated consequences materialize. Overall, this study holds important theoretical and practical implications by establishing clarity in the conceptions, underlying mechanisms and (directions of) influences that can be expected when using particular IDSSs for ethical decisions. (shrink)

“Moral imagination” is the capacity to register that one’s perspective on a decision-making situation is limited, and to imagine alternative perspectives that reveal new considerations or approaches. We have developed a Moral Imagination approach that aims to drive a culture of responsible innovation, ethical awareness, deliberation, decision-making, and commitment in organizations developing new technologies. We here present a case study that illustrates one key aspect of our approach – the technomoral scenario – as we have applied it in our work (...) with product and engineering teams. Technomoral scenarios are fictional narratives that raise ethical issues surrounding the interaction between emerging technologies and society. Through facilitated role-playing and discussion, participants are prompted to examine their own intentions, articulate justifications for actions, and consider the impact of decisions on various stakeholders. This process helps developers to re-envision their choices and responsibilities, ultimately contributing to a culture of responsible innovation. (shrink)

This chapter focusses on Martin Lang's ongoing practiced-based research project "The Truth in Painting 1993", which employs painting, photography and digital manipulation brought together in pictures that depict events from 1993. Each painting in the series contains an amalgamation of analogue painterly marks, printed scans of paintings and digital painting. The projects anticipates that both the lack of certainty around the mediums used, and the occasions depicted in the works, will spur viewers to question notions of socially constructed and (...) mind-independent truths connected to incidents of that time. In this essay, Lang frames his work in relation to ideas of slippage of the work of art as a single, unique, entity in Jacques Derrida's The Truth in Painting (1978) and Enrico Terrone's concept of "standards of correctness" in "The Post-truth in Painting" (2019). This positions Lang's project in a post-truth world, where the "truth is out there", but which cannot always be clearly defined and understood. (shrink)

I here settle a recent dispute between two rival theories in distributive ethics: Restricted Prioritarianism and the Competing Claims View. Both views mandate that the distribution of benefits and burdens between individuals should be justifiable to each affected party in a way that depends on the strength of each individual’s separately assessed claim to receive a benefit. However, they disagree about what elements constitute the strength of those individuals’ claims. According to restricted prioritarianism, the strength of a claim is determined (...) in ‘prioritarian’ fashion by both what she stands to gain and her absolute level of well-being, while, according to the competing claims view, the strength of a claim is also partly determined by her level of well-being relative to others with conflicting interests. I argue that, suitably modified, the competing claims view is more plausible than restricted prioritarianism. (shrink)

We argue that if there are laws of nature, then there must also be accidents. If the “laws” in a world suffice to determine the world’s entire history, then these “laws” cannot play various central roles characteristic of laws, and thus (we conclude) they are not laws at all. Many proposed accounts of lawhood (primitivist accounts, universals accounts, the Best System Account, the Package Deal Account, essentialist accounts) inappropriately permit worlds with laws but no accidents. We identify two otherwise dissimilar (...) accounts that correctly (on our view) deem such worlds impossible; one is Humean and the other is non-Humean. (shrink)

An extended review of the English collection of Marcuse's essays and interviews on Heidegger that addresses the philosophical basis of a synthesis of Marx and Heidegger.

The ecosystem approach to computer system development is similar to management of biodiversity. Instead of modeling machines after a successful individual, it models machines after successful teams. It includes measuring the evaluative diversity of human teams (i.e. the disparity in ways members conduct the evaluative aspect of decision-making), adding similarly diverse machines to those teams, and monitoring the impact on evaluative balance. This article reviews new research relevant to this approach, especially the validation of a survey instrument for measuring computational (...) evaluative differences in humans (the GRINSQ). The research confirms the existence of all four known machine types among humans. (shrink)

Câu hỏi “ong ở đâu ra” và giá trị sinh thái.

This essay asks how Hazlitt’s notion of artistic genius stands up today, where connoisseurs are unfashionable, expertise is distrusted and popular opinion is often courted and highly valued in the generation and reception of art. It does this by analysing Hazlitt’s concepts of gusto and “aesthetic democracy”. First, Hazlitt’s concept of aesthetic democracy is applied to the painting of Thomas Kinkade, the reassessment of ‘slaver’ statues and a conceptual project by Komar and Melamid to highlight some problems with popular opinion (...) in the assessment of art and with collaborative practices that cede authorship to participants (what I call “the democratisation of art”). Then, Hazlitt’s concept of gusto is scrutinised to argue for the importance of the role of the individual artist’s voice in the production of artworks. The article makes two conclusions. First that, Hazlitt’s separation of aesthetic democracy from political democracy negates ethical concerns about “undemocratic art”. Secondly, that Hazlitt’s concepts of artistic genius and gusto remind us of the value of the artist-individual and the aesthetic worth of their undiluted input. Consequently, Hazlitt’s concepts of artistic genius and gusto are useful tools to critically assess contemporary art, against the prevailing current of art criticism, allowing us to assert the immanent importance of art and the role of the artist in its creation. (shrink)

This article makes two main claims: that Debord’s concept of the ‘integrated spectacle’ is related to end of History narratives; and that the related concept of ‘disinformation’ is manifested in new forms of media-driven warfare. These claims are substantiated through a comparative analysis between Debord’s texts and contemporary politics, primarily as described by Adam Curtis and by the RETORT collective. The resulting understanding of our contemporary politics is a situation where subjects who appear to be free, are in fact only (...) free to choose between competing brands of neo-liberalism that manipulate and baffle in order to obfuscate their true agendas. This situation is termed a ‘spectacular malaise’. The article then critiques post-Marxist claims to a re-birth of History and therefore a potential end to the spectacular malaise. It argues that the Arab Spring and Occupy movement did not signal an end to the end of History, as they were unable to articulate an alternative vision. This situation is compared to the last days of the Soviet Union, when change also seemed unimaginable. It identifies Mark Fisher’s call for activists to demonstrate alternative possibilities and reveal contingency in apparently natural orders to counter the spectacular malaise. Three art collectives are considered as potential candidates to take up this challenge: Women on Waves, Voina, and SUPERFLEX. The article concludes that while making actual social and political change is useful for demonstrating alternative possibilities, it is art’s symbolic value that reveals contingency and strikes at the heart of the spectacular malaise. (shrink)

Theories of self-defence tend to invest heavily in ‘liability justifications’: if the Attacker is liable to have defensive violence deployed against him by the Defender, then he will not be wronged by such violence, and selfdefence becomes, as a result, morally unproblematic. This paper contends that liability justifications are overrated. The deeper contribution to an explanation of why defensive permissions exist is made by the Defender’s non-liability. Drawing on both canonical cases of self-defence, featuring Culpable Attackers, and more penumbral cases (...) of self-defence, involving Non-Responsible Threats, a case is assembled for the ‘Non-Liability First Account’ of self-defence. (shrink)

One Rawlsian response to G. A. Cohen’s criticisms of justice as fairness which Cohen canvasses, and then dismisses, is the 'Freedom Objection'. It comes in two versions. The 'First Version' asserts that there is an unresolved trilemma among the three principles of equality, Pareto-optimality, and freedom of occupational choice, while the 'Second Version' imputes to Rawls’s theory a concern to protect occupational freedom over equality of condition. This article is mainly concerned with advancing three claims. First, the 'ethical solution' Cohen (...) advances against the First Version of the Freedom Objection does not grant a fair hearing to the Freedom Objection. Second, the distinction Cohen presses between the legal and moral right of occupational choice in his response to the Second Version cannot save him from worries about Stalinist coercion. Third, Cohen’s response to the First Version of the Freedom Objection is actually in tension with his response to the Second Version of the Freedom Objection. (shrink)

Does smoke cause fire or does fire cause smoke? James Woodward’s “Flagpoles anyone? Causal and explanatory asymmetries” argues that various statistical independence relations not only help us to uncover the directions of causal and explanatory relations in our world, but also are the worldly basis of causal and explanatory directions. We raise questions about Woodward’s envisioned epistemology, but our primary focus is on his metaphysics. We argue that any alleged connection between statistical (in)dependence and causal/explanatory direction is contingent, at best. (...) The directions of causal/explanatory relations in our world seem not to depend on the statistical (in)dependence relations in our world (conceived of either as frequency patterns or as relations among chances). Thus, we doubt that statistical (in)dependence relations are the worldly basis of causal and explanatory directions. (shrink)

AI-supported methods for identifying and combating disinformation are progressing in their development and application. However, these methods face a litany of epistemic and ethical challenges. These include (1) robustly defining disinformation, (2) reliably classifying data according to this definition, and (3) navigating ethical risks in the deployment of countermeasures, which involve a mixture of harms and benefits. This paper seeks to expose and offer preliminary analysis of these challenges.

The public and scholars alike largely consider envy to be reprehensible. This judgment of the value of envy commonly results either from a limited understanding of the nature of envy or from a limited understanding of how to determine the value of phenomena. Overcoming this state requires an interdisciplinary collaboration of psychologists and philosophers. That is, broad empirical evidence regarding the nature of envy generated in psychological studies must inform judgments about the value of envy according to sophisticated philosophical standards. (...) We conducted such a collaboration. Empirical research indicates that envy is constituted by multiple components which in turn predict diverse outcomes that may be functional for the self and society. Accordingly, the value of envy is similarly nuanced. Sometimes, envy may have instrumental value in promoting prudentially and morally good outcomes. Sometimes, envy may be non-instrumentally prudentially and morally good. Sometimes, envy may be bad. This nuanced perspective on the value of envy has implications for recommendations on how to deal with envy and paves the way toward future empirical and theoretical investigations on the nature and the value of envy. (shrink)

Network analysis as a tool for ecological interactions studies has been widely used since last decade. However, there are few studies on the factors that shape network patterns in communities. In this sense, we compared the topological properties of the interaction network between flower-visiting social wasps and plants in two distinct phytophysiognomies in a Brazilian savanna (Riparian Forest and Rocky Grassland). Results showed that the landscapes differed in species richness and composition, and also the interaction networks between wasps and plants (...) had different patterns. The network was more complex in the Riparian Forest, with a larger number of species and individuals and a greater amount of connections between them. The network specialization degree was more generalist in the Riparian Forest than in the Rocky Grassland. This result was corroborated by means of the nestedness index. In both networks was found asymmetry, with a large number of wasps per plant species. In general aspects, most wasps had low niche amplitude, visiting from one to three plant species. Our results suggest that differences in structural complexity of the environment directly influence the structure of the interaction network between flower-visiting social wasps and plants. (shrink)

Thực tế này khá dễ hiểu với các nền kinh tế chưa có nhiều tích lũy, và một lượng lớn đầu tư buộc phải dành cho những công nghệ khá gần với hoạt động kinh tế trong ngắn và trung hạn.

This chapter applies ‘The Decline and Fall of the Spectacle-Commodity Economy’ – the Situationist account of the Watts Rebellion (Los Angeles, 1965) – to the August riots (England, 2011) and the global Occupy movement. It draws two conclusions: that both May ’68 and Occupy were formed by the political violence that preceded them; and that, although the Situationist essay makes problematic claims about race, its assessment of the Spectacle-Commodity Economy remains valuable: in fact, if combined with intersectional theory, it can (...) provide a useful counterbalance to identity politics that can prevent what Alain Badiou calls an ‘immediate riot’ from becoming a ‘historical riot’ by fragmenting mass social movements and undermining unity. (shrink)

Objective correlates—behavioral, functional, and neural—provide essential tools for the scientific study of consciousness. But reliance on these correlates should not lead to the ‘fallacy of misplaced objectivity’: the assumption that only objective properties should and can be accounted for objectively through science. Instead, what needs to be explained scientifically is what experience is intrinsically— its subjective properties—not just what we can do with it extrinsically. And it must be explained; otherwise the way experience feels would turn out to be magical (...) rather than physical. We argue that it is possible to account for subjective properties objectively once we move beyond cognitive functions and realize what experience is and how it is structured. Drawing on integrated information theory, we show how an objective science of the subjective can account, in strictly physical terms, for both the essential properties of every experience and the specific properties that make particular experiences feel the way they do. (shrink)

In this paper, we distinguish between different sorts of assessments of algorithmic systems, describe our process of assessing such systems for ethical risk, and share some key challenges and lessons for future algorithm assessments and audits. Given the distinctive nature and function of a third-party audit, and the uncertain and shifting regulatory landscape, we suggest that second-party assessments are currently the primary mechanisms for analyzing the social impacts of systems that incorporate artificial intelligence. We then discuss two kinds of as-sessments: (...) an ethical risk assessment and a narrower, technical algo-rithmic bias assessment. We explain how the two assessments depend on each other, highlight the importance of situating the algorithm within its particular socio-technical context, and discuss a number of lessons and challenges for algorithm assessments and, potentially, for algorithm audits. The discussion builds on our team’s experience of advising and conducting ethical risk assessments for clients across dif-ferent industries in the last four years. Our main goal is to reflect on the key factors that are potentially ethically relevant in the use of algo-rithms, and draw lessons for the nascent algorithm assessment and audit industry, in the hope of helping all parties minimize the risk of harm from their use. (shrink)

"The enterprise initiative is probably the most significant political and cultural influence to have affected Western and Eastern Europe in the last decade. In this book, academics from a range of disciplines debate Mary Douglas's distinctive Grid Group cultural theory and examine how it allows us to analyse the complex relation between the culture of enterprise and its institutions. Mary Douglas, Britain's leading cultural anthropologist, contributes several chapters."--BOOK JACKET.Title Summary field provided by Blackwell North America, Inc. All Rights Reserved.

When visual attention is directed away from a stimulus, neural processing is weak and strength and precision of sensory data decreases. From a computational perspective, in such situations observers should give more weight to prior expectations in order to behave optimally during a discrimination task. Here we test a signal detection theoretic model that counter-intuitively predicts subjects will do just the opposite in a discrimination task with two stimuli, one attended and one unattended: when subjects are probed to discriminate the (...) unattended stimulus, they rely less on prior information about the probed stimulus’ identity. The model is in part inspired by recent findings that attention reduces trial-by-trial variability of the neuronal population response and that they use a common criterion for attended and unattended trials. In five different visual discrimination experiments, when attention was directed away from the target stimulus, subjects did not adjust their response bias in reaction to a change in stimulus presentation frequency despite being fully informed and despite the presence of performance feedback and monetary and social incentives. This indicates that subjects did not rely more on the priors under conditions of inattention as would be predicted by a Bayes-optimal observer model. These results inform and constrain future models of Bayesian inference in the human brain. (shrink)