Best input device regarding refresh rate

[David McFarlane]

Tobias,

As liw says, the PST SRBox includes the capacity 
to connect to any buttons you like, and includes 
instructions on how to do that.  That's what we 
do here all the time.  It just takes a box, some 
buttons of your choice, some wire, cable, and 
connectors, and some drilling and soldering.  No big deal.

Also, Empirisoft advertises some high speed 
button boxes & keyboards 
(http://www.empirisoft.com/Hardware.aspx?index=2 
).  Then there is always the Cedrus button boxes 
(http://www.cedrus.com ), and if you look around 
you can no doubt find more alternatives.

Finally, you might browse through Behavior 
Research Methods 
(http://www.springer.com/psychology/cognitive+psychology/journal/13428 
) to see if anyone has written up any other thoughts.

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (twitter.com/EPrimeMaster)


At 5/3/2012 07:20 AM Thursday, liwenna wrote:
>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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