Putnam argues that accepting semantic externalism would require refuting the brains-in-a-vat skeptical hypothesis, and as a result, the skeptic will not succeed in proving her claim. Putnam’, s argument, however, is epistemically circular and inconclusive. The present article is devoted to evaluating Wright and Noonan’, s attempt to provide a plausible version of Putnam’, s argument. Based on the evaluation of these arguments, it was determined that (1) Wright and Noonan’, s arguments can at best only show that I am not a brain in a vat, but without the use of any auxiliary premises, they can not prove that we are not brains in a vat,(2) Contrary to Wright’, s claim, this premise of his argument that In BIVese, “, brain-in-a-vat”,does not refer to brains-in-a-vat, and its result, that is, that my language is not BIVese, lead his argument to be epistemically circular,and (3) Noonan’, s attempt to avoid epistemic circularity has not led to the desired result, and his argument, like Wright’, s, is epistemically circular.