Anthropology engages often with feminists from non-Western traditions, whose perspectives and experiences can differ from those of white European and American feminists. Historically, such 'peripheral' perspectives have sometimes been marginalized and regarded as less valid or important than knowledge from the western world. Feminist anthropologists have claimed that their research helps to correct this systematic bias in mainstream feminist theory. On the other hand, anthropologists' claims to include and engage with such other perspectives have in turn been criticized - local people are seen as the producers of local knowledge, which only the western anthropologist can convert into social science theory. Because feminist theorists come predominantly from the west, and do not emerge from the cultures they study (some of which have their own distinct traditions of feminism, like the grassroots feminism of Latin America), their ideas about feminism may contain western-specific assumptions that do not apply simply to the cultures they investigate. Rosaldo criticizes the tendency of feminists to treat other contemporary cultures as anachronistic, to see other parts of the world as representing other periods in western history - to say, for example, that gender relations in one country are somehow stuck at a past historical stage of those in another. Western feminists had, Rosaldo said, viewed women elsewhere as “ourselves undressed and the historical specificity of their lives and of our own becomes obscured”. Anthropology, Moore argued, by speaking "about" and not "for" women, could overcome this bias.