The impact of late, non-balanced bilingualism on cognitive performance.

•Attention, fluency and lexical access tested in 193yr. 1 & 4 university students.•Bilinguals (language students) compared with monolinguals (literature students).•Bilingual advantage found on selective attention (Y1 and 4) and switching (Y4).•Monolingual advantage detected on letter fluency (Y4).•Late, non-balanced bilingualism has similar cognitive effects as early balanced one.