The Journal of Philosophy:
Externalism, Skepticism, and Skeptical Dogmatism
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A claimed benefit of epistemic externalism is that it alone can avoid skepticism. Most epistemic externalists, however, allow a residual amount of internalism in terms of a defeasibility condition. The paper argues that this internal condition is sufficient for skeptics to cast doubt on many claims to justified belief about perceptual matters about the world. Furthermore, the internal defeasibility condition also opens the door to a darker form of skepticism; skeptical dogmatism, which maintains that many of our perceptually based beliefs are probably false. Thus, the claimed benefits of externalism in avoiding skepticism are greatly exaggerated.