In verbal communication, the hearer takes advantage of the linguistic expressions of certainty and evidentiality to assess how committed the speaker might be to the truth of the informational content of the utterance. Little is known, however, about the precise developmental mechanism of this ability. In this chapter, we approach the question by…

A divided-attention experiment with 24 college students who were native speakers of Japanese speaking English and 16 English-Japanese bilingual students speaking Japanese confirm the prediction that performance in a thinking task declines when a concurrent linguistic task in a foreign language is required. (SLD)