STATISTICAL ANALYSIS
For success and tester assistance, regression analysis was conducted to determine the effect of group on task performance. A binary logistic regression was conducted for the dichotomous variable success and a multinomial regression analysis was conducted for tester assistance separately for each experimental task. For hand actions and time to plan/execute, nonparametric tests (Mann–Whitney U ) were used because the data was not normally distributed using the Shapiro-Wilk test of normality (p < 0.05 across comparisons). Significance was set at p < 0.05 and p -values between 0.05 and 0.1 were considered as statistical trends.