Best input device regarding refresh rate

[liwenna]

Hi all,

Nice issue to put some thought in. I have always refused to use SR boxes 
for exactly the reasons given by Michiel (stupid heavy buttons -_-) 
although if you have a nice and trustworthy technician, I suppose these 
could be replaced by at least somewhat easier buttons? 

Since I usually require only two response buttons I have always used an USB 
mouse as the response device. I was under the impression that these were 
read out at a faster rate than keyboards (polling rate is the word we're 
looking for here) but a short trip on google now learns me that, like 
keyboards, the default polling rate on a mouse is likely also 125 hz. But, 
here comes the good news: it can be tweaked. Someone out there on the net 
even states that his mouse has a polling rate of 1000 hz, which sounds 
rather incredible. I do intend to have a look at it the next time I visit 
my lab (although my ict-guys will probably not allow me to change or even 
see it ;) ). 

Although, I also agree with Michiels' statement that if your effect is 
dependent on such a small jitter than it is probably not quite worth it, I 
do believe we owe it to ourselves and our hypotheses to make as clean 
measurements as possible so if it ís possible, we probably should adjust. 
Google seems to tell me that the way to go about that, is dependent on your 
operating system so google for that combined with 'mouse/keyboard' and 
'polling rate' to find clues. 

best,

AW

On Wednesday, 2 May 2012 12:43:56 UTC+2, Tobias wrote:
>
> 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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