Development of the second-language lexicon was investigated in two on-
line experiments. In both experiments, priming was examined within the
second language under automatic conditions and for nonnative speakers
of two different levels of performance. Experiment 1 showed second-la
nguage priming for various lexical relationships for proficient nonnat
ive speakers. Moreover, the results found for the proficient bilingual
s were highly similar to those found for a group of native control sub
jects. Experiment 2 examined priming of the dominant and subordinate m
eanings of biased homographs such as ''seal.'' Priming was found for b
oth meanings, for proficient bilinguals working in their second langua
ge, and for native control subjects, but only for the dominant meaning
s for a group of intermediate nonnative speakers. Again, the pattern o
f results found for the proficient bilinguals and native controls was
highly similar. The ensemble of these results provides evidence for se
cond-language autonomy, which is determined, however, by both level of
expertise and type of lexical relationship. The autonomy postulated h
ere is limited, moreover, to exploiting the second-language lexicon fo
r the purposes of recognition and cannot at present be said to extend
to production. (C) 1997 Academic Press.