Means of produced tilting angles for each age group in the remote control task are presented
in the lower panel of Fig. 3. An overall ANOVA was calculated with the within-participant factors diameter (2) and water level (2), the between-participants factor age (4), and the tilting angles as the dependent variable. The analysis yielded significant main effects of the factors diameter,and water level, There was no interaction between the factors water level and age, showing that all age groups equally discriminated the two water levels. However, a significant interaction between
the factors diameter and age, showed that the older the participants,the more they discriminated the two diameters. This is also evident in the increasingly separated graphs in the lower panel of Fig. 3 and in increasing effect sizes of the factor diameter