Assessment Category | Metric Name | Definition | Remark |
---|---|---|---|
Range of Motion (ROM) | ROM Area Ratio | The ratio of the area size of user capability space to the input device work space. | Reflects the user's Movement Range in the range [0, 1]; ideally this value should be close to 1. |
Discrete Tracking | Reaction Time | The time from the jump of the target to the first significant movement by subject. | Reflects the human machine system response Capability (Reaction quickness). |
 | Movement Time | The time between the end of the reaction time to the time after the human subject stayed within the target stably. | Reflects the Movement Quickness. |
 | Movement Speed | Movement speed is the average speed within the movement time window. | Reflects the Movement Quickness in the movement time window. |
 | Error | The average distance from the target position to the subject position. | Reflects overall performance Accuracy. |
 | Deviation | The average distance from the subject position to straight target path line. | Reflects Movement Curvature. This metric is for Joystick only. |
 | Peak Speed Number | The number of peaks in the speed profile within the movement time window. | Fewer PN represent fewer periods of acceleration and deceleration, making a more Smoothness movement. |
 | Dwelling Percentage Time in Target | The percentage of time subject staying in the target during the dwell window period. | The metric is in the range [0, 1]; ideally this value should be close to 1.The higher value indicates a better Stability performance. |
Continuous Tracking | Percentage Time on Target | The percentage time the human subject staying within the target | Reflects overall performance Accuracy and Stability. |
 | Root Mean Square Error | The squared root of the mean-squared distance from subject position to the target position. | Reflects movement Accuracy. |
 | Average Deviation | The average deviation distance from the subject position to straight target path line. | Reflects Movement Curvature. This metric is for Joystick only. |
System Identification | Perturbation Range | The movement range of the human subject in the perturbation direction. | Depends on the instruction to human subject. In case "holding" instruction, the bigger value |
 | Perturbation Standard Deviation | The standard deviation value of the human subject position in the perturbation direction. | indicates weak Strength; in case "relax" instruction, the bigger value indicates less Muscle Stiffness. |
Fun Therapy | ROM Intensity Image | The human subject ROM movement image with the high intensity indicates intensive human movement area. | Reflects Movement Range and Intensity without overwhelming with movement data when task context is unknown. |
 | Motivation Score | Used as a multidimensional assessment tool to evaluate subjects' subjective experience related to a target activity in laboratory experiments | Reflects Motivation |