 Burge’s response to this sort of argument is to accept that we have introspective knowledge of the contents of our own thoughts, but deny that this entails that we can tell introspectively whether two contents are the same or different (Burge 1988). In response, some suggest that knowing that my thought is about water requires ruling out relevant alternative possibilities, and that in slow switching cases the possibility that my thought is instead about XYZ is in fact a relevant alternative that we cannot rule out. (For further dialectical twists and turns, see Ludlow and Martin 1998, and Nuccetelli 2003.)