An error was counted if the participant was not able to hit the target. In this case they had to select the same target again as long as it was successfully selected. Effect of walking on error rate. Users made 6.77% less errors when standing (see Figure 7). A dependent t-test, analyzing the effects of movement on error rate between the standing and the walking condition, shows a significant difference between the standing (M = .23, SE = .03) and the walking condition (M = .30, SE = .04), t(15) = -3.04, p < .01, r = .53). Error rate while walking. In Figure 7, it can be observed that the error rate decreased with larger target sizes. The decrease was higher between the small and the medium targets (29.58%) as between the medium and the large targets (23.19%).