A new argument for linguistic determinants of human thought

We argue that the commonly accepted existence of grammatical concepts such as Person (in the grammatical sense) or Tense poses an unrecognized challenge to the idea that human thought is independent of language. The argument is that such concepts identify aspects of linguistic expressions that also systematically define the contents and identity of the thoughts expressed in language. Since grammatical concepts are not known to have non-grammatical analogues, the thoughts in question do not appear to be non-linguistic in nature. We conclude that language is unlikely to be merely a medium in which independently constituted thoughts are expressed.