In terms of attentional control, early bilingual learners showed the greatest advantage, compared to monolingual speakers and late bilingual speakers. In terms of overall performance on ATN, the three groups performed equally, but when age and verbal ability variables were controlled, there was a difference in reaction time. The early bilingual children's reaction time was tremendously faster than the monolingual children, and only slightly faster than the late bilingual children (Kapa & Colombo, 2013).