 This may suggest that some skeptical proponents of the sources project aim to motivate an instance of the Argument from Unreliability  (§3.3).  As an example, consider Greene’s fMRI-based arguments (Greene et al. 2001; Greene 2003, 2007) against certain “characteristically deontological” intuitions in ethics. The primary experimental data on which his argument is based is the fact that portions of the brain independently implicated in emotional reaction are more active when subjects consider cases giving rise to characteristically deontological intuitions than when they consider cases giving rise to characteristically consequentialist intuitions. However, critics will allege  (§3.3)  that attempts to show that a process is unreliable (independent of disagreement) require independent access to the target domain and such intuition-independent access seems lacking for most of the target domains of philosophical inquiry. In this vein, Berker (2009) argues that the best argument in Greene’s work rests largely on other intuitions about the general normative insignificance of the factors within hypothetical cases to which Greene believes deontological intuitions are responsive. (See Unger 1996 for an entirely a priori criticism of many “characteristically deontological” intuitions for their apparent responsiveness to intuitively normatively insignificant factors.)