Ernest Sosa

This study aims primarily at an account of sensory experience and perception uncommitted to objectual sense data or sense impressions. In the end it does make room for sense impressions, but only as entities somehow abstracted from phenomenological attention to sense experience. The "phenomenological standpoint" is attained by imagining "that a transparent screen has been placed at right angles about three feet from your eyes between you and all the objects before you," and by imagining further that the projection of the objects on such a screen has been cleverly painted on it so as to present an appearance just like that presented by the objects then actually before you. "It is to this possible picture that your attention must now be directed in order for you to be said to be attending to your sense experience itself".

According to Moore, his argument meets three conditions for being a proof: first, the premiss is different from the conclusion; second, he knows the premiss to be the case; and, third, the conclusion follows deductively.2 Further conditions may be required, but he evidently thinks his proof would satisfy these as well. As Moore is well aware, many philosophers will feel he has not given “...any satisfactory proof of the point in question."3 Some, he believes, will want the premiss itself proved. But he has..

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In “Tracking, Competence, and Knowledge,” Ernest Sosa notes that in attempting to account for the conditions for knowledge, externalists have proposed that the justification condition be replaced or supplemented by the requirement that a certain modal relation be obtained between a fact and a subject's belief concerning that fact. While assessing attempts to identify such a relation, he focuses on an account labeled “Cartesian‐tracking”, which accounts for the relation in the form of two conditionals. If a person S believes a proposition P → P P → S believes P. Sosa suggests that be abandoned as a requirement, and that, equipped with his modifications, can offer promising results in connection with skepticism. He argues that modified coupled with the requirement that S's belief be “virtuous” can illuminate the nature of propositional knowledge.