Despite a large variation in LOR, the two groups of Thai bilinguals perceived English and Thai stops in a comparable manner in both discrimination and identification tests.
Perhaps, the between-group difference in LOR was not sufficiently large in this study. It is possible that these bilinguals differ from Thai monolinguals in their L1 perception,
but for adult bilinguals,
the LOR effect may be quite limited especially in the L1. For example, the participant with the longest LOR (30 years) did not stand out either in discrimination or identification scores.