The structure of age: in search of barriers to second language acquisition

The article examines recent evidence that has been offered to support the notion of a sensitive period for second language acquisition. An analysis of that research leaves several questions unresolved. Two small-scale studies are described which attempt to explore some of these issues. In both cases, it is found that the correspondence between language structures in the first and second language is the most important factor affecting acquisition. The age at which second language acquisitions begins is not a significant factor in either study, but the length of residence, indicating the amount of time spent speaking the second language, is significant in the second study. The conclusion is that there is insufficient evidence to accept the claim that mastery of a second language is determined wholly, or even primarily, by maturational factors. Some suggestions are made for an alternative interpretation based on processing differences between older and younger language learners.