Tim Kenyon

Graham Solomon, to whom this collection is dedicated, went into hospital for antibiotic treatment of pneumonia in Oc- ber, 2001. Three days later, on Nov. 1, he died of a massive stroke, at the age of 44. Solomon was well liked by those who got the chance to know him—it was a revelation to?nd out, when helping to sort out his a?airs after his death, how many “friends” he had whom he had actually never met, as his email included correspondence with philosophers around the world running sometimes to hundreds of messages. He was well respected in the philosophical community more broadly. He was for several years a member of the editorial board for the Western Ontario Series in Philosophy of Science. While he was employed at Wilfrid Laurier University in Waterloo, Ontario, several of us at the University of Wat- loo always regarded our own department as a sort of second academic home for him. We therefore decided that it would be appropriate to hold a memorial conference in his honour. Thanks to the generous?nancial support of the Humphrey Conference Fund, we were able to do so in May 2003. Many of the papers in this volume were presented at that conf- ence.

An influential idea in the epistemology of testimony is that people often acquire justified beliefs through testimony, in contexts too informationally poor for the justification to be evidential. This has been described as the Scarcity of Information Objection (SIO). It is an objection to the reductive thesis that the acceptance of testimony is justified by evidence of general kinds not unique to testimony. SIO hinges on examples intended to show clearly that testimonial justification arises in low-information contexts; I argue that the common examples show no such thing. There is a great deal of information available in testimonial contexts, including in the examples alleged to show otherwise – enough information to render SIO implausible. Purported SIO examples tend to give a wrong impression about the informational richness of testimonial contexts, I argue, due to the lack of detail in which they are presented

False polarization (FP) is an interpersonal bias on judgement, the effect of which is to lead people in contexts of disagreement to overestimate the differences between their respective views. I propose to treat FP as a problem of applied social epistemology—a barrier to reliable belief-formation in certain social domains—and to ask how best one may debias for FP. This inquiry leads more generally into questions about effective debiasing strategies; on this front, considerable empirical evidence suggests that intuitively attractive strategies for debiasing are not very effective, while more effective strategies are neither intuitive nor likely to be easily implemented. The supports for more effective debiasing seem either to be inherently social and cooperative, or at least to presuppose social efforts to create physical or decision-making infrastructure for mitigating bias. The upshot, I argue, is that becoming a less biased epistemic agent is a thoroughly socialized project