“…Each one of the 7 interference control tasks included 8 activities with increasing difficulty. The difficulty level was determined according to the following issues [ 57 , 58 , 59 , 60 , 61 , 62 ]: (i) Number of stimuli and presentation time: Simple activities (S) = 10 stimuli were presented for 4 s; and Complex activities (C) = 20 stimuli were presented for 2 s [ 57 , 58 ]; (ii) Graduated indications provided by the adult to present the activity before the beginning of the child’s behavior: 1 = The adult offered modeling and asked the child to imitate her; 2 = The adult offered visual support; 3 = The adult offered auditive support; 4 = The adult did not provide any support [ 59 , 60 , 61 ]. Therefore, considering both criteria (i) Number of stimuli and presentation time with their two levels and (ii) Graduated indication provided by the adult with their four types-, the difficulty of the 8 activities ranged from less to more difficulty: S1, S2, S3, S4, C1, C2, C3, C4.…”