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  1. Bayesianism for Non-Ideal Agents.Mattias Skipper & Jens Christian Bjerring - forthcoming - Erkenntnis:1-23.
    Orthodox Bayesianism is a highly idealized theory of how we ought to live our epistemic lives. One of the most widely discussed idealizations is that of logical omniscience: the assumption that an agent’s degrees of belief must be probabilistically coherent to be rational. It is widely agreed that this assumption is problematic if we want to reason about bounded rationality, logical learning, or other aspects of non-ideal epistemic agency. Yet, we still lack a satisfying way to avoid logical omniscience within (...)
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    Artificial Intelligence and Patient-Centered Decision Making.Jens Christian Bjerring & Jacob Busch - forthcoming - Philosophy and Technology:1-23.
    Advanced AI systems are rapidly making their way into medical research and practice, and, arguably, it is only a matter of time before they will surpass human practitioners in terms of accuracy, reliability, and knowledge. If this is true, practitioners will have a prima facie epistemic and professional obligation to align their medical verdicts with those of advanced AI systems. However, in light of their complexity, these AI systems will often function as black boxes: ​the details of their contents, calculations, (...)
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  3. On Counterpossibles.Jens Christian Bjerring - 2013 - Philosophical Studies (2):1-27.
    The traditional Lewis–Stalnaker semantics treats all counterfactuals with an impossible antecedent as trivially or vacuously true. Many have regarded this as a serious defect of the semantics. For intuitively, it seems, counterfactuals with impossible antecedents—counterpossibles—can be non-trivially true and non-trivially false. Whereas the counterpossible "If Hobbes had squared the circle, then the mathematical community at the time would have been surprised" seems true, "If Hobbes had squared the circle, then sick children in the mountains of Afghanistan at the time would (...)
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  4. Hyperintensional Semantics: A Fregean Approach.Mattias Skipper & Jens Christian Bjerring - forthcoming - Synthese:1-24.
    In this paper, we present a new semantic framework designed to capture a distinctly cognitive or epistemic notion of meaning akin to Fregean senses. Traditional Carnapian intensions are too coarse-grained for this purpose: they fail to draw semantic distinctions between sentences that, from a Fregean perspective, differ in meaning. This has led some philosophers to introduce more fine-grained hyperintensions that allow us to draw semantic distinctions among co-intensional sentences. But the hyperintensional strategy has a flip-side: it risks drawing semantic distinctions (...)
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  5. A Dynamic Solution to the Problem of Logical Omniscience.Mattias Skipper & Jens Christian Bjerring - 2019 - Journal of Philosophical Logic 48 (3):501-521.
    The traditional possible-worlds model of belief describes agents as ‘logically omniscient’ in the sense that they believe all logical consequences of what they believe, including all logical truths. This is widely considered a problem if we want to reason about the epistemic lives of non-ideal agents who—much like ordinary human beings—are logically competent, but not logically omniscient. A popular strategy for avoiding logical omniscience centers around the use of impossible worlds: worlds that, in one way or another, violate the laws (...)
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    Higher-Order Knowledge and Sensitivity.Jens Christian Bjerring & Lars Bo Gundersen - forthcoming - Canadian Journal of Philosophy:1-11.
    It has recently been argued that a sensitivity theory of knowledge cannot ac- count for intuitively appealing instances of higher-order knowledge. In this paper, we argue that it can once careful attention is paid to the methods or processes by which we typically form higher-order beliefs. We base our argu- ment on what we take to be a well-motivated and commonsensical view on how higher-order knowledge is typically acquired, and we show how higher-order knowledge is possible in a sensitivity theory (...)
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    On Counterpossibles.Jens Christian Bjerring - 2014 - Philosophical Studies 168 (2):327-353.
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  8. Granularity Problems.Jens Christian Bjerring & Wolfgang Schwarz - 2017 - Philosophical Quarterly 67 (266):22-37.
    Possible-worlds accounts of mental or linguistic content are often criticized for being too coarse-grained. To make room for more fine-grained distinctions among contents, several authors have recently proposed extending the space of possible worlds by "impossible worlds". We argue that this strategy comes with serious costs: we would effectively have to abandon most of the features that make the possible-worlds framework attractive. More generally, we argue that while there are intuitive and theoretical considerations against overly coarse-grained notions of content, the (...)
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  9. Impossible Worlds and Logical Omniscience: An Impossibility Result.Jens Christian Bjerring - 2013 - Synthese 190 (13):2505-2524.
    In this paper, I investigate whether we can use a world-involving framework to model the epistemic states of non-ideal agents. The standard possible-world framework falters in this respect because of a commitment to logical omniscience. A familiar attempt to overcome this problem centers around the use of impossible worlds where the truths of logic can be false. As we shall see, if we admit impossible worlds where “anything goes” in modal space, it is easy to model extremely non-ideal agents that (...)
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  10. On the Rationality of Pluralistic Ignorance.Jens Christian Bjerring, Jens Ulrik Hansen & Nikolaj Jang Lee Linding Pedersen - 2014 - Synthese 191 (11):2445-2470.
    Pluralistic ignorance is a socio-psychological phenomenon that involves a systematic discrepancy between people’s private beliefs and public behavior in certain social contexts. Recently, pluralistic ignorance has gained increased attention in formal and social epistemology. But to get clear on what precisely a formal and social epistemological account of pluralistic ignorance should look like, we need answers to at least the following two questions: What exactly is the phenomenon of pluralistic ignorance? And can the phenomenon arise among perfectly rational agents? In (...)
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  11. A Higher-Order Approach to Disagreement.Mattias Skipper Rasmussen, Asbjørn Steglich-Petersen & Jens Christian Bjerring - 2018 - Episteme 15 (1):80-100.
    While many philosophers have agreed that evidence of disagreement is a kind of higher-order evidence, this has not yet resulted in formally precise higher-order approaches to the problem of disagreement. In this paper, we outline a simple formal framework for determining the epistemic significance of a body of higher-order evidence, and use this framework to motivate a novel interpretation of the popular “equal weight view” of peer disagreement—we call it the Variably Equal Weight View (VEW). We show that VEW differs (...)
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  12. Non-Ideal Epistemic Spaces.Jens Christian Bjerring - 2010 - Dissertation, Australian National University
    In a possible world framework, an agent can be said to know a proposition just in case the proposition is true at all worlds that are epistemically possible for the agent. Roughly, a world is epistemically possible for an agent just in case the world is not ruled out by anything the agent knows. If a proposition is true at some epistemically possible world for an agent, the proposition is epistemically possible for the agent. If a proposition is true at (...)
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  13. Problems in Epistemic Space.Jens Christian Bjerring - 2012 - Journal of Philosophical Logic (1):1-18.
    When a proposition might be the case, for all an agent knows, we can say that the proposition is epistemically possible for the agent. In the standard possible worlds framework, we analyze modal claims using quantification over possible worlds. It is natural to expect that something similar can be done for modal claims involving epistemic possibility. The main aim of this paper is to investigate the prospects of constructing a space of worlds—epistemic space—that allows us to model what is epistemically (...)
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    Problems in Epistemic Space.Jens Christian Bjerring - 2014 - Journal of Philosophical Logic 43 (1):153-170.
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  15. All the Things We Know: Extended Knowledge.Jens Christian Bjerring & Nikolaj Jang Lee Linding Pedersen - 2014 - Philosophical Issues 24 (1):24-38.
    In this paper we explore the potential bearing of the extended mind thesis—the thesis that the mind extends into the world—on epistemology. We do three things. First, we argue that the combination of the extended mind thesis and reliabilism about knowledge entails that ordinary subjects can easily come to enjoy various forms of restricted omniscience. Second, we discuss the conceptual foundations of the extended mind and knowledge debate. We suggest that the theses of extended mind and extended knowledge lead to (...)
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  16. Review of New Essays on the Knowability Paradox. [REVIEW]Jens Christian Bjerring - 2012 - History and Philosophy of Logic 33 (1):101-104.
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  17.  47
    New Essays on the Knowability Paradox.Jens Christian Bjerring - 2012 - History and Philosophy of Logic 33 (1):101 - 104.
    History and Philosophy of Logic, Volume 33, Issue 1, Page 101-104, February 2012.
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