Best input device regarding refresh rate

[Tobias]

An old but important issue in collecting RT is the refresh rate of the 
input device. I have heard that the typical USB keyboard refresh rate is 
about 125 Hz. This means by using a standard keyboard you have some time 
jitter of up to 8 ms. The refresh rate might even more importantly depend 
on the driver so that you don't even know the exact jitter.

Of course there are more sophisticated input devices such as the E-Prime 
button box. However, they are expensive and not very user friendly 
(unergonomic, heavy, buttons are hard to press). Taken these shortcomings I 
am wondering if you are aware of any more "standard" input devices that 
typically have better refresh rates. I guess for my purposes a refresh rate 
of 250 Hz would be sufficient.

What about Game controllers such as the Microsoft Sidewinder etc.? Do they 
typically have better refresh rates?

Any hints are most appreciated.

Tobias

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