refresh rate USB

[Peter Quain]

I think USB polling rate and USB data transfer rate are 2 different things

At 03:20 AM 8/07/2011, you wrote:
>Hi together,
>
>I plan an experiment in which Reaction Times for two conditions will
>be compared and not too much of a difference is expected. Let's say 15
>ms. I am wondering if an USB keyboard is the appropriate choice for
>such an experiment. I've heard that USB usually has a refresh rate of
>120 Hz, meaning that responses are checked every 8 ms. That's a lot of
>noise added to the real reaction times.
>
>On the other hand, EEG data and other stuff CAN be transferred much
>faster than 120 Hz via USB cable. THe question is, whether Windows (or
>E-Prime) can handle this.
>
>What is your experience here?
>
>Thanks a lot and so long,
>Tobias
>
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