Smooth pursuit frequencies

[la09]

What frequencies do you test smooth pursuit at in your department?

Does anybody know of any evidence to support/reject testing at different frequencies?

[Guy]

As an automatic reaction against being forced to adopt a manufacturer's clinical protocol (usually based on one clinician's ideas of how things should be done) I use a single frequency of 0.4Hz.
My justification for this is based on the admittedly simplistic notion that patients that have the sort of occulomotor abnormality this test is designed to reveal will show an abnormal result at all frequencies; pushing patients to fail at higher frequencies merely serves to increase false positives.
Okay, people don't go to bed without the problem and wake up the following day with it - these conditions are progressive and it is likely that in the earlier stages, an abnormality may be apparent only when we push the system to its limits. Nevertheless, I still believe that the best compromise (optimum test performance) is the use of one stimulus frequency. This is based on no hard data so if anyone can point so some then let's have it.