As pointed out above, **data** for eight children could not be included in the final analyses. Due to technical issues for 2 children (one in each group) during the testing of ESCS at T2 no material was available for analysis. Further, 6 children (2 in the Novel group and 4 in the TAU group) declined to participate in the testing of ESCS at T3. As the attrition rate in our study was 26 %, we examined possible effects due to attrition closer. No differences in eye gaze and gesture behaviors were found when comparing T1 and T2 scores between children that could be included in the final analysis (n = 22) and children that could not (n = 8), all p's > 0.60. However, the chronological age of the attrition group (M = 43.9 months, SD = 3.2) was significantly higher than the chronological age of the included children (M = 39.8 months, SD = 6.7), t (25.34) = 2.22, p = 0.035, equal variances not assumed. Overall, the two final intervention groups were not statistical different from each other at T1 on chronological age (see Table 1), language measures (see Table 1), or IJA measures (independent t-test for eye gaze: p = 0.92, gestures: p = 0.46, see also repeated-measure analyses above).