We develop local forms of Ramsey-theoretic dichotomies for block sequences in infinite-dimensional vector spaces, analogous to Mathias' selective coideal form of Silver's theorem for analytic partitions of [N] ∞ . Under large cardinals, these results are extended to partitions in L(R) and L(R)-generic filters of block sequences are characterized. Variants of these results are also established for block sequences in Banach spaces and for projections in the Calkin algebra. . He would also like to thank his PhD advisor, Justin Tatch Moore, for continued guidance and suggesting the problem of characterizing L(R)-generic filters for the projections in the Calkin algebra which motivated this work.