Table 1.
Definition of Quotient ADHD System Attention and Motion Variables
| Attention Variables | |
|---|---|
| Variable | Definition |
| Accuracy (percent) | Percentage of correct responses |
| Omission Errors (percent) | Percentage of missed targets |
| Commission Errors (percent) | Percentage of incorrect responses to non-targets. |
| Latency (milliseconds) | Mean reaction time to respond to a target. |
| Variability (milliseconds) | Variation in response times to the correct target. |
| C.O.V (number) | Variability that is adjusted to take into account difference in response latency. |
| Motion Variables | |
|---|---|
| Variable | Definition |
| Immobility Duration (milliseconds) | Average amount time spent sitting still. |
| Head Movements (number) | Average number of position changes greater than 1 mm. |
| Displacement (meters) | Total distance traveled by the reflector. |
| Area (centimeters squared) | Total area covered by the reflector's path. |
| Spatial Complexity (scale score) | Complexity of the movement path, with values from 1 (straight line movements) to 2 (more complex movements). |
| Temporal Scaling (scale score) | Frequency of movement, with values from 0 (lack of movements) to 1 (incessant movements). |
Note. Adapted from http://www.quotient-adhd.com.