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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Three things:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>1. You would like to carefully go through this page: http://www.pstnet.com/eprimedevice.cfm - plenty of devices there, but outdated information.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>2. I find that, typically, psychological effects FAR outweigh timing jitter in response devices; typically, one can easily get robust results even with the world's worst timing in a system (you can get, for instance, solid Simon test results in a flash-based timing on random equipment). One may wonder about the importance of an effect if this is not the case, indeed, although I suppose for the more motor oriented experiments (for instance, where you would like to study standard deviation of sequential tapping), this might be important.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>3. The "buttons are hard to press issue" I find is incredibly underrated because psychologists seem to concentrate on system timing and psychology, but seldom that which lies in between (you might call it human-computer interaction). How long does it take, between the start of the button press and the button actually being down? How much motor noise do we find? Are psychological effects sometimes confounded somewhere in between response initiation and completion? I remember doing a standard finger tapping test ("press space bar as fast and often as possible within 10 seconds"), and people got around 60-80 taps on average (IRI=148 ms), whereas it has been norm-scored ages ago at about 50-60 (IRI=182). The difference, of some 34 ms (roughly the size of a Simon effect) or 23%, seems to be far larger than common RT timing issues. Was my group made up of fantastic tappers, or could the difference really be as simple as using an (arggh) mac keyboard with feather-light keys (the ones that stick out about 3 mm)? Now, if you think a normal PC keyboard has heavy keys, try pressing a PST SRBOX button! <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Anyway, hope you like my hints. In general, USB is preferred to PS/2. Legend has it that USB2 may be better in this regard. Anyone can confirm this?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Best,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Michiel<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> e-prime@googlegroups.com [mailto:e-prime@googlegroups.com] <b>On Behalf Of </b>Tobias<br><b>Sent:</b> 02 May 2012 13:44<br><b>To:</b> e-prime@googlegroups.com<br><b>Subject:</b> Best input device regarding refresh rate<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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.<br><br>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.<br><br>What about Game controllers such as the Microsoft Sidewinder etc.? Do they typically have better refresh rates?<br><br>Any hints are most appreciated.<br><br>Tobias<o:p></o:p></p><p class=MsoNormal>-- <br>You received this message because you are subscribed to the Google Groups "E-Prime" group.<br>To view this discussion on the web visit <a href="https://groups.google.com/d/msg/e-prime/-/UNQc7eSIZkcJ">https://groups.google.com/d/msg/e-prime/-/UNQc7eSIZkcJ</a>.<br>To post to this group, send email to <a href="mailto:e-prime@googlegroups.com">e-prime@googlegroups.com</a>.<br>To unsubscribe from this group, send email to <a href="mailto:e-prime+unsubscribe@googlegroups.com">e-prime+unsubscribe@googlegroups.com</a>.<br>For more options, visit this group at <a href="http://groups.google.com/group/e-prime?hl=en">http://groups.google.com/group/e-prime?hl=en</a>.<o:p></o:p></p></div></body></html>
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