[Eeglablist] Wireless keyboards for EEG?

Andrew Hill andrewhill at ucla.edu
Sat Dec 11 16:10:32 PST 2010


Don't do it.  :)  Stay away from both wireless and USB, unless it's a special zero-latency USB protocol-based keyboard (e.g. a special keyboard designed for response collection that has an additional circuit board to monitor and adjust for the issues with USB).

Otherwise a USB protocol will have variable polling latency, and will introduce a (non-fixed) latency into each button-press that will range from about 7ms to over 30 ms, depending on various factors.  Most wireless keyboards are bluetooth, which has a much less predictable lag and jitter than that of USB.

So.. use a PS/2 keyboard or other serial or parallel response box, unless time resolution of 20-50ms is ok.

Best,
Andrew

On Dec 9, 2010, at 8:20 AM, Jacob Martin wrote:

> Hello,
> 
> We are considering purchasing a wireless keyboard to obtain subject
> response entry during EEG recordings.
> 
> Does anyone have suggestions as to the technology that would interfere
> the least with the signal and still work ok?  (e.g. Bluetooth, RF, or
> IR).
> 
> Or, am I better sticking with a wired PS/2 or USB keyboard?
> 
> Thanks for any pointers!
> 
> Sincerely,
> Jacob
> 
> --
> Jacob G. Martin, Ph.D.
> Postdoctoral Research Fellow
> Georgetown University Medical Center
> Department of Neuroscience
> 3970 Reservoir Rd NW
> Research Building WP-01
> Washington, DC 20007
> 202-687-6983
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