In contrast, cross-culturally domains such as colour terms offer the possibility of observable cognitive differences. The cross cultural route, however, is not without problems. First, considerable theoretical ambiguity exists as what the Sapir-Whorf hypothesis says. Most investigators have limited interpretation to domains which are not linked strongly to cultural experience such as colour perception. This however weakens the cultural implications of the link as proposed at least on some occasions by Whorf between language and cognition.
Ambiguity also concerns the strength of the claim being made.
I Structural differences between language systems will, in general, be paralleled by non-linguistic cognitive differences, of an unspecified sort, in the native speakers of the two languages. The structure of anyone's native language strongly influences or fully determines the world-view he will acquire as he learns the language. The latter is interesting but untestable at least directly. It is upon testing this claim that modern evaluation of the Sapir-Whorf hypothesis has mostly been made. As of this writing, most linguists and psychologists believe that evidence offered in its support is flawed'.