No one would disagree with the claim that language and thought interact in many significant ways. There is great disagreement, however, about the proposition that each specific language has its own influence on the thought and action of its speakers. On the one hand, anyone who has learned more than one language is struck by the many ways in which languages differ from one another. But on the other hand, we expect human beings everywhere to have similar ways of experiencing the world.
Comparisons of different languages can lead one to pay attention to 'universals'—the ways in which all languages are similar, and to 'particulars' —the ways in which each individual language, or type of language, is special, even unique. Linguists and other social scientists interested in universals have formulated theories to describe and explain human language and human language behavior in general terms as species-specific capacities of human beings. However, the idea that different languages may influence thinking in different ways has been present in many cultures and has given rise to many philosophical treatises. Because it is so difficult to pin down effects of a particular language on a particular thought pattern, this issue remains unresolved. It comes in and out of fashion and often evokes considerable energy in efforts to support or refute it.