PMC5964212_01
Example of vestibular hypofunction seen across all frequencies for Case 1. A sinusoidal rotation at 0.04 Hz, 60 deg/s by rotational chair testing. The smooth sinusoid is the chair/head rotation at 0.04 Hz, and the scatter line represents the slow phases of compensatory nystagmus in response to the sinusoidal head (and chair) rotations. The abscissa is time measured in seconds. LB, left beating nystagmus; RB, right beating nystagmus. Performed using Micromedical Technologies (Chatham, IL, USA).
fneur-09-00351-g001.jpg
PMC5964212_01_fneur-09-00351-g001.jpg
F1
Rotational chair, more so than caloric vestibular testing, demonstrated bilateral vestibular dysfunction (Figures 1 and 2) with reduced gain values on step velocity along with a reduced time constant.
The summary of average gain values at frequencies between 0.01 and 0.64 Hz sinusoidal rotations. The gain values were below normal for all frequencies tested for Cases 1 and 2 and were reduced at most frequencies for Case 3.
fneur-09-00351-g002.jpg
PMC5964212_03_fneur-09-00351-g002.jpg
F2
Hz (Figure 2). Her caloric responses improved following removal from the "sick-building" environment (Table 1).
PMC5964212_02
The summary of average gain values at frequencies between 0.01 and 0.64 Hz sinusoidal rotations. The gain values were below normal for all frequencies tested for Cases 1 and 2 and were reduced at most frequencies for Case 3.
fneur-09-00351-g002.jpg
PMC5964212_03_fneur-09-00351-g002.jpg
F2
Hz (Figure 2). Her caloric responses improved following removal from the "sick-building" environment (Table 1).
PMC5964212_03
The summary of average gain values at frequencies between 0.01 and 0.64 Hz sinusoidal rotations. The gain values were below normal for all frequencies tested for Cases 1 and 2 and were reduced at most frequencies for Case 3.
fneur-09-00351-g002.jpg
PMC5964212_03_fneur-09-00351-g002.jpg
F2
Hz (Figure 2). Her caloric responses improved following removal from the "sick-building" environment (Table 1).