Crispin Wright on Epistemic Internalism Versus Externalism

What is at issue in the debate between internalism and externalism in epistemology? This question has no single answer, since there is not just one debate, but a whole cluster of debates whose interconnections are complex and contested. One important crux of debate concerns whether the justifying role of perceptual experience supervenes on its phenomenal character. By this criterion, internalism says yes, while externalism says no.