The Thai bilinguals in this study differed greatly from one another in their length of residence in English-speaking countries.
If L2 learning affects not only L2 but also L1 performance,
it may be informative to examine how variation in L2 experience might influence speech perception.
An LOR in L2-speaking environment is commonly used as a variable in L2 research. Thus,
the Thai bilinguals were divided into two groups with an LOR of 50 months as a cutoff point and follow-up analyses were conducted for discrimination and identification data.
Table 1 shows mean characteristics of the two groups of bilinguals.
The two groups differed significantly in LOR (p < 0.05), but not in Age or
AOA.