Execution:
- Patient is in sitting position wearing a laser tracker on their head, which points at the bullseye on the target map 3ft / 90cm away from the patient
- The examiner instructs the patient to close the eyes and to turn the head all the way to the right
- The patient is asked to relocate the head back to the starting position
- The examiner measures the error as the distance between the end and start point
- The patient opens the eyes, relocates the laser at the bullseye, and repeats the procedure for at least 6 trials in total
- Repeat the procedure with the head turning to the left, as well as for cervical flexion and extension
Positive Outcome: The mean error for any direction is larger than 4.5°, which on this target is more than 6 cm from the bullseye. This means that for at least half of the trials, the dots can be found outside the second ring
| Study | Reliability | Sn | Sp | LR+ | LR- |
| Roren et al. (2009) | Test-retest ICC=0.68 | NA | NA | NA | NA |
| Comment: It’s important that the patient moves the head relatively slow and steady. The faster the head moves, the more the JPSE represents vestibular afferention rather than cervical afferention that we actually want to measure | |||||