otometrics ICS Impulse USB User Manual page 25

User Guide
To see the gain and peak velocity values for a data point and the corresponding head and eye velocity traces, move the
cursor over the point. To scroll through the individual traces, first click in the window of interest then use the up/down
arrow keys or the scroll wheel on the mouse. Use the Delete key to delete a selected impulse.
Within Normal Limits
In this example of head impulse data, both sides are within normal limits. Looking at the Gain graph the data points are all
within the normal range (in the white area). The head data shows very well performed head impulses and the eye data
shows a vestibular ocular reflex (A) that mirrors the head velocities. There may be a few catch-up saccades.
Overt saccades
left
This is an example of head impulse data that exhibits an abnormal vestibular ocular reflex on the side indicated by the
gain response and the catch-up saccades. Looking at the Gain graph the data points are all within the gray range indicating a
unilateral loss. The head data shows very well performed head impulses and the eye data shows an inadequate vestibular
ocular reflex (A) that does not mirror the head velocities. There are overt catch-up saccades present (B). Catch-up saccades
are easier to visualize in the 3D analysis.
Otometrics - ICS Impulse USB 25