Putnam has a very nice argument in his Brains in a vat paper. [1] Basically he argues that a brain in a box lacks any causal connection to the box, the brain do

Putnam has a very nice argument in his Brains in a vat paper. [1] Basically he argues that a brain in a box lacks any causal connection to the box, the brain does never learn any information about the box. The idea "I am a brain in a box" lacks a reference and any reasoning about it is at best a lucky guess, even if true. The issue is the similar, but more fundamental, as me claiming "you have a misplaced comma in the second sentence of your next email." That may or may not be true, but if it is true it is certainly not based on sound reasoning. [1] http://ieas.unideb.hu/admin/file_2908.pdf http://ieas.unideb.hu/admin/file_2908.pdf