 For example, it was found that heritage bilinguals diverge from monolinguals in the ultimate state of their eventual language system in ways similar to adult L2 learners even though they are native speakers and even when the learning process takes places in a naturalistic setting in early childhood.This casts doubt on the critical period hypothesis (CP) that age is the determining factor in convergent language acquisition, another rich area of debate in GenSLA research  With respect to child L2 acquisition, it was hypothesized that if child and adult L2 learners follow the same developmental path this would call into question the claims made by some GenSLA researchers that differences between L1 and L2 learners are due to the inaccessibility of UG.This is because in GenSLA child L2 learners under the age of 7 to 8 are hypothesized to have access to UG.