Memory as a Generative Epistemic Source

It is widely assumed that memory has only the capacity to preserve epistemic features that have been generated by other sources. Specifically, if S knows (justifiedly believes/rationally believes) that p via memory at T2, then it is argued that (i) S must have known (justifiedly believed/rationally believed) that p when it was originally acquired at T1, and (ii) S must have acquired knowledge that p (justification with respect to p/rationality with respect to p) at T1 via a non-memorial source. Thus, according to this view, memory cannot make an unknown proposition known, an unjustified belief justified, or an irrational belief rational–it can only preserve what is already known, justified, or rational. In this paper, I argue that condition (i) is false and, a fortiori , that condition (ii) is false. Hence, I show that, contrary to received wisdom in contemporary epistemology, memory can function as a generative epistemic source.     

The Epistemic Status of Auxiliary Hypotheses: A Reply to Douven

I have previously argued that anti-realism cannot use the claim that theories have empirically equivalent rivals (EE) to establish that theories are underdetermined by evidence (UD). Douven objects that the auxiliary hypotheses needed to generate observational equivalence need not as I claimed be themselves underdetermined if (EE) is true, because they may be either compatible with observation or acceptable in the constructive-empiricist sense. I reply that these conditions are not strong enough to establish (EE): the auxiliaries have to be epistemically warranted if they are to fix a theory's observational commitments unambiguously. The support they require need not presuppose their respective observational consequences, because there are more holistic sources of warrant.     

Epistemic Instrumentalism and Reasons for Belief: A Reply to Tom Kelly's "Epistemic Rationality as Instrumental Rationality: A Critique"

Tom Kelly argues that instrumentalist accounts of epistemic rationality fail because what a person has reason to believe does not depend upon the content of his or her goals. However, his argument fails to distinguish questions about what the evidence supports from questions about what a person ought to believe . Once these are distinguished, the instrumentalist can avoid Kelly's objections. The paper concludes by sketching what I take to be the most defensible version of the instrumentalist view.     

Pretense,Counterfactuals, and Bayesian Causal Models: Why What Is Not Real Really Matters

Young children spend a large portion of their time pretending about non‐real situations. Why? We answer this question by using the framework of Bayesian causal models to argue that pretending and counterfactual reasoning engage the same component cognitive abilities: disengaging with current reality, making inferences about an alternative representation of reality, and keeping this representation separate from reality. In turn, according to causal models accounts, counterfactual reasoning is a crucial tool that children need to plan for the future and learn about the world. Both planning with causal models and learning about them require the ability to create false premises and generate conclusions from these premises. We argue that pretending allows children to practice these important cognitive skills. We also consider the prevalence of unrealistic scenarios in children's play and explain how they can be useful in learning, despite appearances to the contrary.     

Epistemic Inertia and Epistemic Isolationism: A Response to Buchanan

abstract   Allen Buchanan argues that conventional applied ethics is impoverished and would be enriched by the addition of social moral epistemology. The aim here is to clarify this argument and to raise questions about whether such an addition is necessary about how such enrichment would work in practice. Two broad problems are identified. First, there are various kinds and sources of epistemic inertia, which act as an obstacle to epistemic change. Religion is one striking example and seems to pose a deep problem for Buchanan's liberal social moral epistemology. Philosophy also exhibits a distinctive kind of epistemic inertia (metaphilosophical beliefs about the impropriety of applying philosophy are hard to shift), but also suffers from epistemic isolationism: (its arguments and conclusions are isolated from practical influence). It is concluded that not only will a liberal social moral epistemology have to overcome a pernicious epistemic inertia with regard to religious belief, but also a different kind of epistemic inertia closer to home .     

Sorites Is No Threat to Modus Ponens: A Reply to Kochan

A recent article by Jeff Kochan contains a discussion of modus ponens that among other thing alleges that the paradox of the heap is a counterexample to it. In this note I show that it is the conditional major premise of a modus ponens inference, rather than the rule itself, that is impugned. This premise is the contrapositive of the inductive step in the principle of mathematical induction, confirming the widely accepted view that it is the vagueness of natural language predicates, not modus ponens, that is challenged by Sorites.     

赶鬼真难!

1984年4月底,我和同班的十几位同学,到湖北红安县金沙河水库实习.住在一个偏僻的小山村里。小山村座落在一个小山湾里,总共只有二十几户人家,距县城也比较远,村民们淳朴憨厚,就是脑筋有点愚。     

Reply to Schooler: Consistent Is Not Conclusive

ABSTRACT— In this reply, I address the major issues raised by Schooler in his commentary on my article. Although we probably disagree about some points, I suspect that we are in agreement that there is empirical evidence that can be interpreted as being consistent with some aspects of the mental-exercise hypothesis. However, from my perspective, the available evidence is far from conclusive with respect to mental exercise slowing the rate of age-related mental decline, and recognition of the current state of uncertainty on this issue will likely facilitate progress in identifying the role of mental activity and other moderators of mental aging.     

《回到马克思》真的具有阿尔都塞情结吗?——与郝敬之商榷

本刊 2 0 0 2年第 9期刊载的有关《回到马克思》一书的评论文章 ,在学界引起了较大反响。本刊认为 ,健康、规范的学术争论有助于创造良好的学术环境 ,推动理论研究的深入发展。为此 ,本刊特发表如下两篇文章 ,就与《回到马克思》有关的理论问题阐述不同的看法。