Re: reaction time measures ("Hornsby, Benjamin Wade Young" )


Subject: Re: reaction time measures
From:    "Hornsby, Benjamin Wade Young"  <ben.hornsby@xxxxxxxx>
Date:    Fri, 8 Jun 2007 09:50:35 -0500
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

This is a multi-part message in MIME format. ------_=_NextPart_001_01C7A9DC.5FBCD8B6 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thanks much to all who responded about programs capable of measuring reaction times. The wide range of suggestions has been very helpful so I thought I'd post the consensus to date in case others were interested. A few programs were consistently mentioned including: =20 EPrime http://spike.lrdc.pitt.edu/eprime.php =20 Presentation www.neurobs.com =20 DMDX (which is free) http://www.u.arizona.edu/~kforster/dmdx/dmdx.htm =20 Others mentioned were: =20 psychopy (for visual presentations) http://www.psychopy.org/ =20 Psychtoolbox (for Matlab) http://psychtoolbox.org/wikka.php?wakka=3DHomePage =20 Pxlab http://www.pxlab.de/ =20 MiniCog=20 http://minicog.wjh.harvard.edu/ =20 =20 =20 =20 I've posted individual replies below as some included other relevant information. =20 Thanks again, =20 Ben =20 Try: =20 http://psychtoolbox.org/wikka.php?wakka=3DHomePage =20 =20 Check psychopy (http://www.psychopy.org/) (for visual presentations) If you do not mind programming, python/pygame is good enough for many experiments.=20 It is difficult to ensure than you have millisecond precision on each trial because non real-time, pre-emptive operating systems like Windows or Linux can switch to other processes and create latencies ( i.e. delays in stimulus delivery or detection of button press). But this is not often a difficulty in practice. First, you can check for latencies in your program, second the variance of human subjects' decision times is typically order of magnitude larger than the variance in the timing of the computer. =20 regarding reaction time, investigate Cogent software (free download from Statistical Parametric Mapping in the UK) which runs on Matlab (available for purchase from the mathworks in USA) =20 =20 I have used EPrime for such experiments it is fully portable=20 =20 E-Prime from Psychology Software Tools, Inc, is your best bet. =20 I believe E-Prime can do this. =20 E-Prime =20 http://spike.lrdc.pitt.edu/eprime.php =20 Also check out, the following for collecting data on a handheld =20 http://minicog.wjh.harvard.edu/ =20 =20 I've used Presentation from www.neurobs.com, but also see the list at http://visionscience.com/documents/strasburger_files/strasburger.html =20 I recommend Presentation (http://www.neurobs.com <http://www.neurobs.com/> ). You can try it free and the license prices are not too bad compared to other commercial packages. It provides you <1ms accuracy with button presses. It runs fine on a laptop. =20 =20 We use Presentation by NeuroBehavioral Systems (www.neurobs.com). It do visual and/or auditory stimuli and the accuracy on stimulus presentation and RTs is generally under 1 ms (re. the vertical refresh for visual RTs). Of course, the typical laptop display has its delay for achieving full, but you can measure that for the particular device, if necessary. Actually, NBS is very concerned about timing issues, and the company is very helpful with problems. The program runs under Windows (xp, 2000, etc.) and controls stimuli and gets responses through DirectX. It also has handles for fMRI and EEG experiments. =20 ...you can test a full-feature version for (I think) 45 days at no cost. The documentation is good, and if you have a little programming experience (Matlab or almost anything else), you should be able to make it do what you want. =20 http://www.u.arizona.edu/~kforster/dmdx/dmdx.htm =20 =20 The program DMDX by John Forster does what you want and is free. http://www.u.arizona.edu/~kforster/dmdx/dmdx.htm There are other commercial options (e.g., presentation)=20 =20 I am doing sign phonetics tests with RT measurements. I have found a freeware via Internet. It is called PXLab, and at least to my purposes it suits fine. =20 I haven't used it, but I believe that the MATLAB psychophysics toolbox might serve your purpose. It's at psychtoolbox.org. =20 ________________________________ From: Hornsby, Benjamin Wade Young=20 Sent: Thursday, June 07, 2007 9:34 AM To: AUDITORY@xxxxxxxx Subject: reaction time measures =20 Hi, Sorry if this is not a relevant topic for the list. I am interested in doing a visual reaction time task where subjects respond when a simple visual stimulus is presented on a computer screen. I'm looking for accuracy within ~5-10 ms and I'd like, if possible, to make this portable and use a laptop computer without having to drag along any external hardware for running the experiment. Does anyone know of existing software that could do this? Any leads would be greatly appreciated. =20 Thanks Much, =20 Ben Hornsby =20 ------_=_NextPart_001_01C7A9DC.5FBCD8B6 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" = xmlns:o=3D"urn:schemas-microsoft-com:office:office" = xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:st1=3D"urn:schemas-microsoft-com:office:smarttags" = xmlns=3D"http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3DContent-Type content=3D"text/html; = charset=3Dus-ascii"> <meta name=3DGenerator content=3D"Microsoft Word 11 (filtered medium)"> <!--[if !mso]> <style> v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} </style> <![endif]--><o:SmartTagType namespaceuri=3D"urn:schemas-microsoft-com:office:smarttags" = name=3D"country-region"/> <o:SmartTagType = namespaceuri=3D"urn:schemas-microsoft-com:office:smarttags" name=3D"place"/> <o:SmartTagType = namespaceuri=3D"urn:schemas-microsoft-com:office:smarttags" name=3D"PersonName"/> <!--[if !mso]> <style> st1\:*{behavior:url(#default#ieooui) } </style> <![endif]--> <style> <!-- /* Font Definitions */ @xxxxxxxx {font-family:Tahoma; panose-1:2 11 6 4 3 5 4 4 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman";} a:link, span.MsoHyperlink {color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {color:purple; text-decoration:underline;} span.EmailStyle17 {mso-style-type:personal; font-family:Arial; color:windowtext;} span.EmailStyle18 {mso-style-type:personal-reply; font-family:Arial; color:navy;} @xxxxxxxx Section1 {size:8.5in 11.0in; margin:1.0in 1.25in 1.0in 1.25in;} div.Section1 {page:Section1;} --> </style> <!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--> </head> <body lang=3DEN-US link=3Dblue vlink=3Dpurple> <div class=3DSection1> <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:navy'>Thanks much to all who responded = about programs capable of measuring reaction times. The wide range of = suggestions has been very helpful so I thought I&#8217;d post the consensus to date in = case others were interested. A few programs were consistently mentioned = including:<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:navy'>EPrime<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'><a href=3D"http://spike.lrdc.pitt.edu/eprime.php">http://spike.lrdc.pitt.edu= /eprime.php</a><o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:navy'>Presentation<o:p></o:p></span></font= ></p> <p class=3DMsoNormal><font size=3D2 face=3D"Courier New"><span = style=3D'font-size:10.0pt; font-family:"Courier New"'><a = href=3D"www.neurobs.com">www.neurobs.com</a><o:p></o:p></span></font></p>= <p class=3DMsoNormal><font size=3D2 face=3D"Courier New"><span = style=3D'font-size:10.0pt; font-family:"Courier New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3D"Courier New"><span = style=3D'font-size:10.0pt; font-family:"Courier New"'>DMDX (which is = free)<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:blue'><a href=3D"http://www.u.arizona.edu/~kforster/dmdx/dmdx.htm" title=3D"http://www.u.arizona.edu/~kforster/dmdx/dmdx.htm">http://www.u.a= rizona.edu/~kforster/dmdx/dmdx.htm</a></span></font><font size=3D2 color=3Dnavy face=3DArial><span = style=3D'font-size:10.0pt;font-family:Arial; color:navy'><o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = color=3D"#333399" face=3DArial><span = style=3D'font-size:10.0pt;font-family:Arial;color:#333399'>Others mentioned were:<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = color=3D"#333399" face=3DArial><span = style=3D'font-size:10.0pt;font-family:Arial;color:#333399'><o:p>&nbsp;</o= :p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>psychopy (for = visual presentations)<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'><a href=3D"http://www.psychopy.org/" target=3D"_blank" = title=3D"http://www.psychopy.org/">http://www.psychopy.org/</a><o:p></o:p= ></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>Psychtoolbox = (for Matlab)<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'><a href=3D"http://psychtoolbox.org/wikka.php?wakka=3DHomePage">http://psycht= oolbox.org/wikka.php?wakka=3DHomePage</a><o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size:12.0pt'>Pxlab<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size:12.0pt'>http://www.pxlab.de/<o:p></o:p></span></font><= /p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>MiniCog = <o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'><a href=3D"http://minicog.wjh.harvard.edu/">http://minicog.wjh.harvard.edu/<= /a><o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>I&#8217;ve posted = individual replies below as some included other relevant = information.<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>Thanks = again,<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'>Ben<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'>Try:<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'><a href=3D"http://psychtoolbox.org/wikka.php?wakka=3DHomePage">http://psycht= oolbox.org/wikka.php?wakka=3DHomePage</a><o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>Check psychopy = (<a href=3D"http://www.psychopy.org/" target=3D"_blank" = title=3D"http://www.psychopy.org/">http://www.psychopy.org/</a>) (for visual presentations)<br> <br> If you do not mind programming, python/pygame is good enough for many experiments. <br> <br> It is difficult to ensure than you have millisecond precision on each = trial because non real-time, pre-emptive operating systems like Windows or = Linux can switch to other processes and create latencies ( i.e. delays in stimulus delivery or detection of button press). But this is not often a = difficulty in practice. First, you can check for latencies in your program, second the variance of human subjects' decision times is typically order of = magnitude larger than the variance in the timing of the = computer.<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>regarding reaction = time,<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>investigate Cogent = software (free download from Statistical Parametric Mapping in the = <st1:country-region w:st=3D"on">UK</st1:country-region>) which runs on Matlab (available for = purchase from the mathworks in <st1:place w:st=3D"on"><st1:country-region = w:st=3D"on">USA</st1:country-region></st1:place>)<o:p></o:p></span></font= ></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>I have used = EPrime for such experiments it is fully portable&nbsp;<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>E-Prime from = Psychology Software Tools, Inc, is your best bet.<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>I believe E-Prime = can do this.<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'>E-Prime<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'><a href=3D"http://spike.lrdc.pitt.edu/eprime.php">http://spike.lrdc.pitt.edu= /eprime.php</a><o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>Also check out, the following for collecting data on a handheld<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'><a href=3D"http://minicog.wjh.harvard.edu/">http://minicog.wjh.harvard.edu/<= /a><o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>I've used = Presentation from <a href=3D"www.neurobs.com">www.neurobs.com</a>, but also see the list at = <a href=3D"http://visionscience.com/documents/strasburger_files/strasburger.= html">http://visionscience.com/documents/strasburger_files/strasburger.ht= ml</a><o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>I recommend = Presentation (<a href=3D"http://www.neurobs.com/">http://www.neurobs.com</a>). You can = try it free and the license prices are not too bad compared to other commercial = packages. It provides you &lt;1ms accuracy with button presses. It runs fine on a = laptop.<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>We use Presentation = by NeuroBehavioral Systems (<a = href=3D"www.neurobs.com">www.neurobs.com</a>).&nbsp; It do visual and/or auditory stimuli and the accuracy on stimulus = presentation and RTs is generally under 1 ms (re. the vertical refresh for visual RTs).&nbsp; Of course, the typical laptop display has its delay for = achieving full, but you can measure that for the particular device, if = necessary.&nbsp; Actually, NBS is very concerned about timing issues, and the company is = very helpful with problems.&nbsp; The program runs under Windows (xp, 2000, = etc.) and controls stimuli and gets responses through DirectX.&nbsp; It also = has handles for fMRI and EEG experiments.<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier = New"'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>&#8230;you can test = a full-feature version for (I think) 45 days at no cost.&nbsp; The = documentation is good, and if you have a little programming experience (Matlab or = almost anything else), you should be able to make it do what you = want.<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:blue'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'><a href=3D"http://www.u.arizona.edu/~kforster/dmdx/dmdx.htm">http://www.u.ar= izona.edu/~kforster/dmdx/dmdx.htm</a><o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:blue'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:blue'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:blue'>The program DMDX by John Forster = does what you want and is free. <a = href=3D"http://www.u.arizona.edu/~kforster/dmdx/dmdx.htm" title=3D"http://www.u.arizona.edu/~kforster/dmdx/dmdx.htm">http://www.u.a= rizona.edu/~kforster/dmdx/dmdx.htm</a></span></font><o:p></o:p></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:blue'>There are other commercial options&nbsp;(e.g., presentation) </span></font><o:p></o:p></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 = face=3D"Courier New"><span style=3D'font-size:10.0pt;font-family:"Courier New"'>I am doing sign = phonetics tests with RT measurements. I have found a freeware via Internet. It is = called PXLab, and at least to my purposes it suits = fine.<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'>I haven't used it, but I believe that the MATLAB psychophysics = toolbox might serve your purpose.&nbsp; It's at <a = href=3D"http://psychtoolbox.org" title=3D"http://psychtoolbox.org">psychtoolbox.org</a>.<o:p></o:p></span>= </font></p> <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p> <div> <div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font = size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'> <hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1> </span></font></div> <p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span = style=3D'font-size:10.0pt; font-family:Tahoma;font-weight:bold'>From:</span></font></b><font = size=3D2 face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> = Hornsby, Benjamin Wade Young <br> <b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, June 07, = 2007 9:34 AM<br> <b><span style=3D'font-weight:bold'>To:</span></b> <st1:PersonName = w:st=3D"on">AUDITORY@xxxxxxxx</st1:PersonName><br> <b><span style=3D'font-weight:bold'>Subject:</span></b> reaction time = measures</span></font><o:p></o:p></p> </div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Hi,<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Sorry if this is not a relevant topic for the list. I = am interested in doing a visual reaction time task where subjects respond = when a simple visual stimulus is presented on a computer screen. I&#8217;m = looking for accuracy within ~5-10 ms and I&#8217;d like, if possible, to make this = portable and use a laptop computer without having to drag along any external = hardware for running the experiment. Does anyone know of existing software that = could do this? Any leads would be greatly = appreciated.<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Thanks Much,<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'><o:p>&nbsp;</o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Ben Hornsby<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'><o:p>&nbsp;</o:p></span></font></p> </div> </body> </html> ------_=_NextPart_001_01C7A9DC.5FBCD8B6--


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