Table 1.

Summary of Measures and Abbreviations

Measure	Abbreviation	Definition
Absolute mean error	—	Absolute value of the mean of the error signal
Variance of the error	—	Variance of the error signal
Complexity index	CI	Summation of the sample entropies for scales 1–4
Percentage of time within the target region	PTTR	Percentage of task time that the stylus coordinates were within the target region
Cumulative micropause duration	CMD	Summation of the time periods during which the stylus position did not change while performing the task