Goal-directed Tasks | Metric | Definition | Remark |
---|---|---|---|
Continuous Tracking | Percentage Time in Target (PTT) | The percentage of the time the human subject staying within the target window. | Accuracy and Steadiness |
 | Root Mean Square Error (RMSE) | The squared root of the mean-squared distance from the subject position to the target position. | Accuracy |
 | Deviation | The mean of the perpendicular distance from the subject position to the target line within the movement time. | Path Deviation |
 | Speed_Mean (SM) | The mean of the subject speed during the continuous tracking task | Speed Consistency |
 | Speed_StdDev (SS) | The standard deviation of the subject speed during the continuous tracking task | Speed Consistency |
Discrete Tracking (Target Acquisition) | Reaction Time | The time from the movement of the target to the first significant movement made by the subject. | Reaction Quickness |
 | Movement Time | The time window from the end of the reaction time to the time after which the user has stably reached the target. | Movement Quickness |
 | Deviation | The mean of the perpendicular distance from the subject position to the target path line. | Path Deviation |
 | Movement Speed | The mean of subject speed. | Movement Quickness |
 | Peak Speed Number | The number of local maximum speed within the movement time window. | Smoothness |
 | Dwelling Percentage Time in Target | The percentage of the time that the subject stayed within the target window during the Dwelling Time. | Stability |
 | Success Percentage | The percentage of the targets that have been successfully reached by the subject. | Overall Reaching Capability |
System Identification | Error_Mean | The mean of the displacement outside of the holding area in both x and y direction | Strength (under "hold" instruction) |
 | Error_StdDev. | The standard deviation of the displacement outside of the holding area in both x and y direction |  |