The
literature on perception and skepticism can be helpfully organized around two skeptical
arguments: closure arguments and underdetermination arguments. Where H
= I have hands and ~BIV = I am not a handless brain in a vat, one familiar closure argument
proceeds as follows: (1) If I am justified in believing H, then I am
justified in believing ~BIV. (2) But I am not justified in believing ~BIV. (3) So, I am not justified in believing H. The
popular response is to reject (2).
According to liberal Mooreans,
(2) is false because one’s perceptual experience gives one immediate
justification for H and thus mediate justification for ~BIV (by closure). According to conservatives, we lack immediate perceptual justification for H. Non-skeptical conservatives reject (2) by arguing
that our justification for H partly consists in some antecedent justification
for ~BIV. According to some non-skeptical
conservatives, the antecedent justification is an a priori entitlement. According to others, the justification is
inferential—say, an abductive argument from the patterning of our perceptual
experience to the probable truth of our perceptual beliefs. While liberal Mooreanism and conservatism are
often taken to be the only ways to deny (2), the liberal rationalism of Silins (2008) affords a subtle compromise.
Some other important work in the literature on
perception and skepticism responds to the following underdetermination argument:
(A) I have the same perceptual evidence whether ~BIV
or BIV is true.
(B) So, my evidence does not favor believing ~BIV over
BIV.
(C) But if (B) is true, then I am not justified in
believing H.
(D) So, I am not justified in believing H.
Epistemological disjunctivists reject (A). Although
epistemological disjunctivism has gained adherents in recent years, it is not a
majority view. Most epistemologists reject
either (C) or the inference from (A) to (B).
Some externalists reject (C) by denying that justification supervenes on
evidence and holding that non-evidential factors justify our belief in H. Some conservatives reject the move from (A)
to (B) by insisting that there is a non-skeptical alternative to BIV that better
explains one’s perceptual evidence. |