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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear Gislin,<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">There is also a good range supplied by Huaxintouch;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://www.huaxintouch.com/Product/index/cat_id/2">http://www.huaxintouch.com/Product/index/cat_id/2</a><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">Existing touchscreen technologies range from resistive, to capacitive, to infrared beam scattering. Resistive has always been considered robust for public display
screens (can handle bad treatment) but suffers from the need for the heavy pressure that you describe.
<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">iPad screens are capacitive, which allows for a measure of applied touch pressure.<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">The infrared technology seems to be the default now for larger screens (above 15 inch). This supports multi-touch but, as you say, may sometimes register a
false positive if the finger is near the screen but not yet touching.<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">We have been using a “Multi Touch Screen Overlay T-series Kit” from CycloTouch (https://www.cyclotouch.com.au/product_info.php?products_id=2506), but I believe
this is rebranded from Huaxintouch. It has worked well, but needs to be clamped to an existing screen and would usually block access to the control buttons for the host screen. For that reason, we have ordered a large Philips commercial display (43BDL4051T).
It’s in the mail, but now you have me worried that the touch sensitivity may be insufficient. I will let you know how it goes.<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">Two work arounds you have probably already considered; ensure sunlight is not hitting the screen, and provide audio feedback to the participant when their finger
touch has been successfully registered.<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">Best<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Matt
<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> visionlist [mailto:visionlist-bounces@visionscience.com]
<b>On Behalf Of </b>Ankur Gupta<br>
<b>Sent:</b> Thursday, 5 October 2017 10:47 AM<br>
<b>To:</b> William K. Stell; Yury Petrov; gislin@jhu.edu<br>
<b>Cc:</b> CVNet; Visionlist<br>
<b>Subject:</b> Re: [visionlist] [cvnet] Seeking advice on touchscreens<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Try elo touch products (<a href="https://www.elotouch.com/">https://www.elotouch.com/</a>). We are using it in our lab and it's performance is satisfactory. Also it can easily be integrated with psychtoolbox in matlab.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Oct 5, 2017, 01:24 William K. Stell <<a href="mailto:wstell@ucalgary.ca">wstell@ucalgary.ca</a>> wrote:<o:p></o:p></p>
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<p><span style="font-family:"Calibri","sans-serif";color:black">Perhaps a row of iPads (thinking of the way Cerebral Mechanics made a virtual optokinetic grating cylinder from a box of 4 monitors (OptoMotry).<o:p></o:p></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<div id="m_-5942368721578230420x_Signature">
<div id="m_-5942368721578230420x_divtagdefaultwrapper">
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black"> </span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">--</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="margin-top:6.0pt;background:white">
<span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">“Treat people as if they were what they ought to be, and you will
</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black"> help them become what they are capable of becoming.”</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="margin-top:3.0pt;background:white">
<span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black"> - Johann Wolfgang von Goethe</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="margin-top:3.0pt;background:white">
<span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">--</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black"> </span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">William K. Stell, PhD, MD</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span style="font-family:"Calibri","sans-serif";color:black">Professor, Department of Cell Biology and Anatomy<o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black"> and Department of Surgery</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">Member, Lions Sight Centre</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">Member, Hotchkiss Brain Institute (HBI)
</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">Associate Member, Alberta Children's Hospital Research Institute (ACHRI)</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">University of Calgary - Cumming School of Medicine</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">3330 Hospital Dr. NW</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">Calgary, Alberta, Canada T2N 4N1</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">(tel) : 1-403-220-7501</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">(fax) : 1-403-210-8840</span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="m-5942368721578230420xmsoplaintext" style="background:white"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black"><a href="http://www.ucalgary.ca/research4kids/members/stell_full" target="_blank">http://www.ucalgary.ca/research4kids/members/stell_full</a></span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
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bclair@ucalgary.ca</a></span><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Calibri","sans-serif";color:black">The views and opinions expressed above are the personal property of the writer and are not to be shared by the addressee without permission. They are also not necessarily those of University
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">
<a href="mailto:cvnet-bounces@lawton.ewind.com" target="_blank">cvnet-bounces@lawton.ewind.com</a> <<a href="mailto:cvnet-bounces@lawton.ewind.com" target="_blank">cvnet-bounces@lawton.ewind.com</a>> on behalf of Gislin Dagnelie <<a href="mailto:gislin@lions.med.jhu.edu" target="_blank">gislin@lions.med.jhu.edu</a>><br>
<b>Sent:</b> October 4, 2017 2:58:24 PM<br>
<b>To:</b> Yury Petrov<br>
<b>Cc:</b> CVNet; Visionlist<br>
<b>Subject:</b> Re: [cvnet] Seeking advice on touchscreens</span> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">Thanks, Yury.<br>
<br>
Most of our tests are at arm's length, so an iPad is too small to allow the <br>
necessary eccentricity range, unfortunately.<br>
<br>
Best, Gislin<br>
<br>
<br>
On 4 Oct 2017 at 20:30, Yury Petrov <<a href="mailto:yury.petrov.4u@gmail.com" target="_blank">yury.petrov.4u@gmail.com</a>> wrote:<br>
<br>
Apple has nice touch screens. Did you try iPad? I use them for eye-hand <br>
coordination test.<br>
<br>
On Wed, Oct 4, 2017 at 10:41 AM, Gislin Dagnelie <br>
<<a href="mailto:gislin@lions.med.jhu.edu" target="_blank">gislin@lions.med.jhu.edu</a>> wrote:<br>
<br>
Dear colleagues,<br>
<br>
For some of the eye-hand coordination tests and phosphene mapping tests<br>
in my lab we have been using touchscreens for a number of years, but we've<br>
not always been happy with their reliability.<br>
<br>
With some, it appears that proximity of the finger is enough to register a<br>
response, whereas with others a finger press goes unnoticed if the area<br>
touched is too wide or the pressure too low.<br>
<br>
Has anyone found a type/brand/model that they worked reliably for many<br>
subjects?<br>
<br>
If you have given upon touchscreens, what alternative (e.g., a 3-D tracker)<br>
have you used instead?<br>
<br>
Please feel free to respond in private or to the list. I'll compile the responses<br>
I get by this weekend.<br>
<br>
Best regards,<br>
<br>
Gislin Dagnelie<br>
<br>
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