Summary |
Disagreement is ubiquitous. We disagree about everything from the most trivial matter to matters of the utmost importance. In the paradigm case, two people disagree when one believes a proposition, and the other disbelieves that same proposition. Other disagreements may involve suspending judgment, conflicting credences (or degrees of beliefs), and perhaps even other non-cognitive attitudes. The phenomenon of disagreement has been used as an indication of many things. First, some take disagreement (at least of a certain sort) to indicate that there is no objective fact of the matter. For instance, if equally informed, intelligent, and open-minded individuals continue to disagree about which flavor of ice cream is the best, the best explanation of this may be that there is no fact of the matter -- that ice cream flavor preferences are simply a matter of taste. Such arguments have been used in meta-ethics to argue against kinds of moral realism. Second, some take disagreement to have significant epistemic effects. For instance, if we are committed to there being an objective fact of the matter regarding the nature of the quantum world, then the fact that one is aware of equally informed, intelligent, and open-minded individuals who disagree with them about the nature of the quantum world, might undermine the rationality (or epistemic justification) of the belief in question. Such arguments have been used in epistemology to advance skeptical conclusions. Much of the recent epistemological literature on disagreement concerns the evaluation of such arguments, and whether there can be rational grounds to 'stick to your guns' in the face of disagreement. The debate around the epistemic significance of disagreement has often focused on a particular kind of disagreement - peer disagreement. Epistemic peers are individuals who are in an equally good epistemic position on the matter at hand, they are equally likely to get it right. The central question, then is what is it rational for an individual to believe when they discover that an epistemic peer disagrees with them? Answers to this question divide into two main camps. According to conciliatory views, such a discovery comes with rational pressure to reduce your confidence in your belief. According to the most prominent conciliatory view, the equal weight view, such a discovery calls for 'splitting the difference' which in paradigm cases of disagreement calls for both parties to become skeptical. According to steadfast views, there are at least some cases where it can be rational to maintain one's view even once one has discovered a peer that disagrees. |