<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css" style="display:none"><!-- p { margin-top: 0px; margin-bottom: 0px; }--></style>
</head>
<body dir="ltr" style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;">
<p>Hi,<br>
</p>
<p><br>
</p>
<p>Use a life saver card in free space is bit harder and not everyone can do it without good instruction, especially for divergence. A thin fixation stick with a fine tip (or a pencil tip) can be used to guide the binocular fixation distance to help the viewer
(https://www.youtube.com/watch?v=wcVX684r3xQ). A Remy separator can aid divergence.<br>
</p>
<p><br>
</p>
<p>Shun-nan <br>
</p>
<p><br>
</p>
<div id="Signature">
<div style="font-family:Tahoma; font-size:13px">
<div class="BodyFragment"><font size="2"><span style="font-size:10pt">
<div class="PlainText">------------------------------------------------<br>
Shun-nan Yang, PhD</div>
<div class="PlainText">Director, Applied Vision Science Program<br>
Director of Research / Senior Scientist<br>
Vision Performance Institute<br>
College of Optometry, Pacific University<br>
Office: Scott Hall Room 123</div>
<div class="PlainText">Forest Grove, OR 97116 USA <br>
Office phone #: 503.352.2852<br>
------------------------------------------------</div>
</span></font></div>
</div>
</div>
<div style="color: rgb(33, 33, 33);">
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> visionlist <visionlist-bounces@visionscience.com> on behalf of Tsao, Doris Y. <dortsao@caltech.edu><br>
<b>Sent:</b> Saturday, March 21, 2020 2:27 PM<br>
<b>To:</b> Lester Loschky; David Peterzell<br>
<b>Cc:</b> David Peterzell; cvnet; Christopher Tyler; visionlist@visionscience.com<br>
<b>Subject:</b> Re: [visionlist] [cvnet] Trying to demonstrate stereoscopic vision remotely</font>
<div> </div>
</div>
<div>Hi Lester,
<div><br>
<div>You could also suggest they recreate the naturally occuring stereogram that led Wheatstone to discover stereopsis in the first place: wedges of light popping out from the bottom of a well-turned frying pan (due to different rotation of the wedges in the
two eyes).</div>
<div><br>
</div>
<div>Best,</div>
<div>Doris</div>
</div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> cvnet <cvnet-bounces@lawton.ewind.com> on behalf of Lester Loschky <loschky@ksu.edu><br>
<b>Sent:</b> Saturday, March 21, 2020 10:39 AM<br>
<b>To:</b> David Peterzell <davidpeterzell@me.com><br>
<b>Cc:</b> cvnet <cvnet@mail.ewind.com>; Christopher Tyler <cwtyler2020@gmail.com>; visionlist@visionscience.com <visionlist@visionscience.com>; David Peterzell <dpeterzell@berkeley.edu><br>
<b>Subject:</b> Re: [cvnet] Trying to demonstrate stereoscopic vision remotely</font>
<div> </div>
</div>
<div>
<div dir="ltr">Love it, David! I've made those on my own as well, but it hadn't occurred to me to teach students how to do it. I think that really will make the concepts very concrete for them. And, as Christopher mentions in his Scholarpedia page, crossed
eye viewing is easier for most people than the "look through" method, so I think a lot of students can get that to work. Wonderful idea!
<div><br>
</div>
<div>Best wishes,</div>
<div><br>
</div>
<div>Les</div>
</div>
<br>
<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On Sat, Mar 21, 2020 at 1:56 AM David Peterzell <<a href="mailto:davidpeterzell@me.com">davidpeterzell@me.com</a>> wrote:<br>
</div>
<blockquote class="x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left-width:1px; border-left-style:solid; border-left-color:rgb(204,204,204); padding-left:1ex">
<div style="word-wrap:break-word; line-break:after-white-space">In addition to showing them Christopher Tyler’s Stereogram (using Magic Eye examples), I do my best to teach them to free fuse. If that goes well with a few of them, then I teach them how to make
their own stereo photos using the cameras on their smart phones. 1. Have your subject hold still. 2. Take a photo. 3. Take a second photo with the camera moved just a couple inches to the left or right, still centered on the subject. 4. Put the photos
in something like PowerPoint. 5. Crop and realign the photos as needed (crossed or uncrossed). 6. View This isn’t for everyone, and some people get headaches. But I’ve had many students have a blast with this once they learn this. It has always seemed to
me to be a good way to teach about stereoscopic vision and the construction of binocular depth perception.
<div><br>
</div>
<div>Here are just a few of my own examples, all made on the spot with an iPhone. These sets are made for crossed not uncrossed viewing. If they appear small, click on them to open them. Who can find the Serbian vision scientists? </div>
<div><br>
</div>
<div>Dave</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div style="word-wrap:break-word; line-break:after-white-space"><b>David Henry Peterzell, Ph.D., Ph.D.<br>
--Professor, John F. Kennedy University, Clinical Psychology Doctoral Program, College of Psychology<br>
--Visiting Scholar, University of California, Vision Science Program, School of Optometry</b></div>
<div style="word-wrap:break-word; line-break:after-white-space"><b><br>
</b></div>
<div style="word-wrap:break-word; line-break:after-white-space"><b>JFKU Top Minds video: </b></div>
<div style="word-wrap:break-word; line-break:after-white-space"><b><a href="http://blog.jfku.edu/john-f-kennedy-top-minds-professor-david-peterzell-phd/" target="_blank">http://blog.jfku.edu/john-f-kennedy-top-minds-professor-david-peterzell-phd/</a></b></div>
</div>
<div><br>
</div>
<div><img id="x_gmail-m_5946447991887628481B203FAD2-BE7A-4284-A31B-6076541B8CC0" width="320" height="200" src="cid:170fe2b24a7a7b0b8cb1"></div>
<div><br>
</div>
<div><img id="x_gmail-m_59464479918876284811D62C773-E8FC-4184-BE14-B6D1A0AD13FE" width="320" height="200" src="cid:170fe2b24a770a82b932"></div>
<div><br>
</div>
<div><img id="x_gmail-m_59464479918876284810033B91B-59C7-4C01-8C6B-8BEB7D1782A0" width="320" height="200" src="cid:170fe2b24a7827a8bee3"></div>
<div><br>
</div>
<div><img id="x_gmail-m_5946447991887628481BF564735-FC49-495B-AF29-C7B7652D35B1" width="320" height="200" src="cid:170fe2b24a8a8053cab4"></div>
<div><br>
</div>
<div><img id="x_gmail-m_59464479918876284814C03388A-9830-490E-A2AF-63FC39489CB6" width="320" height="200" src="cid:170fe2b24a8ab8b1ceb5"></div>
<div><br>
</div>
<div><img id="x_gmail-m_5946447991887628481D3DA76B3-AA10-46AF-B332-FE1518670805" width="320" height="200" src="cid:170fe2b24a87b3f5f286"></div>
<div><br>
</div>
<div><img id="x_gmail-m_59464479918876284811DB72ED5-F954-4747-A4D7-0CB7075F1786" width="320" height="200" src="cid:170fe2b24a8af9563897"></div>
<div><br>
</div>
<div><img id="x_gmail-m_59464479918876284816AF8A8EB-7830-4AAD-9334-8FF3B780843D" width="320" height="200" src="cid:170fe2b24a868f35a2d8"></div>
<div><br>
</div>
<div><img id="x_gmail-m_594644799188762848101736359-369B-4C71-A50C-719279904253" width="320" height="200" src="cid:170fe2b24a839266ff39"></div>
<div><br>
</div>
<div><img id="x_gmail-m_5946447991887628481F675C096-D1D5-4E23-AC9A-D6AD07582856" width="320" height="200" src="cid:170fe2b24a880712649a"></div>
<div><br>
</div>
<div><img id="x_gmail-m_594644799188762848126B66466-823C-49B5-8428-E0E59C22D1D5" width="320" height="200" src="cid:170fe2b24a85714fa04b"></div>
<div><br>
</div>
<div><img id="x_gmail-m_594644799188762848100008AD1-1789-4091-AD0B-A332C9E8F507" width="320" height="200" src="cid:170fe2b24a8235f8b03c"></div>
<div><br>
</div>
<div><img id="x_gmail-m_5946447991887628481B470381F-DF73-4B84-8ACA-B54870A9BF26" width="320" height="200" src="cid:170fe2b24a8253eaa25d"></div>
<div><br>
</div>
<div><img id="x_gmail-m_5946447991887628481B5EF2BDC-AE45-4D53-8206-894F528D4A96" width="320" height="200" src="cid:170fe2b24a888014d27e"></div>
<div><br>
</div>
<div><img id="x_gmail-m_5946447991887628481406D6E9A-7EC1-461B-8ED7-EF2D07EB757C" width="320" height="200" src="cid:170fe2b24a8f00cc089f"></div>
<div><br>
</div>
<div><img id="x_gmail-m_5946447991887628481A0276B29-A8AA-4F5A-9DA5-6DAC25654E07" width="320" height="200" src="cid:170fe2b24a8def12dcf10"><img id="x_gmail-m_59464479918876284813AA54D5F-8E70-4900-8FA1-C5DC831C223B" width="320" height="200" src="cid:170fe2b24a8f86ab52111"></div>
<div><br>
</div>
<div>Click on this one to view. (crossed and uncrossed)</div>
<div><img id="x_gmail-m_5946447991887628481A96389A3-CF72-4FFC-9C9E-3E2F28A3AAF8" width="320" height="200" src="cid:170fe2b24a8b9bb772a12"><img id="x_gmail-m_59464479918876284810716099F-8E51-457C-B32C-E3389D970253" width="320" height="200" src="cid:170fe2b24a8e5d2a7cc13"></div>
<div><br>
</div>
<div><img id="x_gmail-m_594644799188762848146E003BA-E085-4C8C-844B-C28493F3E4B0" width="320" height="200" src="cid:170fe2b24a8c08ed08014"></div>
<div><br>
<div>
<div><br>
</div>
<br>
<div>
<blockquote type="cite">
<div>On Mar 20, 2020, at 9:50 PM, Christopher Tyler via cvnet <<a href="mailto:cvnet@lawton.ewind.com" target="_blank">cvnet@lawton.ewind.com</a>> wrote:</div>
<br>
<div>
<div dir="ltr">You could try autostereograms, such as the examples on my <a href="http://www.scholarpedia.org/article/Autostereogram" target="_blank">
Scholarpedia page</a>. Not everyone can get them, but they're pretty effective for those who can.
<div><br>
</div>
<div>All the best,</div>
<div>Christopher</div>
</div>
<br>
<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On Fri, Mar 20, 2020 at 9:35 PM Lester Loschky <<a href="mailto:loschky@ksu.edu" target="_blank">loschky@ksu.edu</a>> wrote:<br>
</div>
<blockquote class="x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left-width:1px; border-left-style:solid; border-left-color:rgb(204,204,204); padding-left:1ex">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">Hi Everybody,
<div><br>
</div>
<div>If you teach Sensation and Perception, and are currently preparing to teach it remotely, you may have the same question I have: how can you demonstrate stereovision remotely?</div>
<div><br>
</div>
<div>As preface, the following are methods I have used in in-person classes to demonstrate stereo vision:</div>
<div>
<ol>
<li>an actual stereoscope and example stereoimages to share with students (including the classic Julesz square tile random-dot-stereogram image)<br>
</li><li>example stereoscopic lenticular lens images to share with students</li><li>red/green anaglyph images with sets of cardboard & plastic red/green anaglyph glasses<br>
</li><li>Google Cardboard plus cell phone to share with students</li><li>random dot autosterographic images</li><li>touching two pen tips together using two eyes versus one eye</li><li>learning about crossed vs. uncrossed disparity using two fingers at different distances</li></ol>
<div>Unfortunately, my students don't uniformly have access to the apparatuses required for 1-4 above. </div>
<div><br>
</div>
<div>Re. # 3 (red/green anaglyph images), I've thought of having students order a single pair of red/green anaglyph glasses online. However, it appears that the cardboard and plastic ones can only be purchased in bulk. (I guess they're too cheap to sell individually.)
They also might not arrive in time, but students could still enjoy them once they get them.</div>
</div>
<div><br>
</div>
<div>Re. #4 (Google Cardboard), I recall getting a free Google Cardboard from the NYTimes several years ago. However, they are now no cheaper than $5 (Irisu, of India), and likely wouldn't arrive in time.</div>
<div><br>
</div>
<div>Regarding option #5 (random-dot autostereograms), I have found that since seeing random dot autostereographic images in depth requires perceptual learning, a large proportion of students don't manage to learn (within the short time period given in a single
class period). (Of course, many students may have a lot of time on their hands now, so they might keep at it long enough to learn to perceive them. But there will definitely be a good proportion of students who don't try long enough to learn, and so don't
get it.)</div>
<div><br>
</div>
<div>#6 (touching two pen tips together) is definitely something that can be done remotely. However, it doesn't have the "Wow!" factor of other demonstrations. It is more of an "oh, really..." experience to realize how much worse you are with one eye than
two. </div>
<div><br>
</div>
<div>#7 (using two fingers at different distances to teach crossed vs. uncrossed disparity) can definitely be done remotely. It is very educational, but again does not have the "Wow" factor. </div>
<div><br>
</div>
<div>There is also the finger "hot dog" illusion, which can be done remotely. It is interesting, but quite different from all of the others in that stereoscopic depth perception is not involved.</div>
<div><br>
</div>
<div>For the related phenomenon of motion parallax, "wiggle vision" is a very nice demonstration:</div>
<div>
<div><a href="http://www.well.com/user/jimg/stereo/stereo_gate.html" target="_blank">http://www.well.com/user/jimg/stereo/stereo_gate.html</a></div>
</div>
<div><a href="https://www.3dwiggle.com/2016/06/28/5-wigglegrams-you-need-to-see-before-you-die/" target="_blank">https://www.3dwiggle.com/2016/06/28/5-wigglegrams-you-need-to-see-before-you-die/</a><br>
</div>
<div><br>
</div>
<div>Of course, depth perception from motion parallax is importantly theoretically related to stereoscopic vision (both involve two different images from two different views, one seen over time (and only needing one eye)--motion parallax--and the other seen
simultaneously (and requiring two eyes)--stereovision). But it is not the same as stereoscopic vision, so is a separate but related issue.</div>
<div><br>
</div>
<div>For the related phenomenon of binocular disparity, there is the famous "hole in your hand" illusion using a cardboard paper towel roll. If students have a spare cardboard paper towel roll, they can do this remotely. But, again, it is a theoretically
related but separate issue. </div>
<div><br>
</div>
<div>Any other suggestions would be appreciated. </div>
<div><br clear="all">
<div>Best wishes,</div>
<div><br>
</div>
<div>Les</div>
-- <br>
<div dir="ltr">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>Lester Loschky</div>
<div>
<div>Professor</div>
<div>Associate Director, Cognitive and Neurobiological Approaches to Plasticity Center<br>
Department of Psychological Sciences<br>
471 Bluemont Hall</div>
<div>
<div>1114 Mid-Campus Dr North</div>
Kansas State University<br>
Manhattan, KS <span style="font-size:10pt; font-family:Helvetica">66506-5302</span> </div>
</div>
<div>email: <a href="mailto:loschky@ksu.edu" target="_blank">loschky@ksu.edu</a></div>
<div>research page: <a href="https://www.k-state.edu/psych/research/loschkylester.html" target="_blank">https://www.k-state.edu/psych/research/loschkylester.html</a></div>
<div>lab page: <a href="http://www.k-state.edu/psych/vcl/index.html" target="_blank">http://www.k-state.edu/psych/vcl/index.html</a></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
_______________________________________________<br>
cvnet mailing list<br>
<a href="mailto:cvnet@lawton.ewind.com" target="_blank">cvnet@lawton.ewind.com</a><br>
<a href="https://lawton.ewind.com/mailman/listinfo/cvnet" rel="noreferrer" target="_blank">https://lawton.ewind.com/mailman/listinfo/cvnet</a><br>
</blockquote>
</div>
<br>
_______________________________________________<br>
cvnet mailing list<br>
<a href="mailto:cvnet@lawton.ewind.com" target="_blank">cvnet@lawton.ewind.com</a><br>
<a href="https://lawton.ewind.com/mailman/listinfo/cvnet" target="_blank">https://lawton.ewind.com/mailman/listinfo/cvnet</a><br>
</div>
</blockquote>
</div>
<br>
</div>
</div>
</div>
</blockquote>
</div>
<br clear="all">
<div><br>
</div>
-- <br>
<div dir="ltr" class="x_gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>Lester Loschky</div>
<div>
<div>Professor</div>
<div>Associate Director, Cognitive and Neurobiological Approaches to Plasticity Center<br>
Department of Psychological Sciences<br>
471 Bluemont Hall</div>
<div>
<div>1114 Mid-Campus Dr North</div>
Kansas State University<br>
Manhattan, KS <span style="font-size:10pt; font-family:Helvetica">66506-5302</span> </div>
</div>
<div>email: <a href="mailto:loschky@ksu.edu" target="_blank">loschky@ksu.edu</a></div>
<div>research page: <a href="https://www.k-state.edu/psych/research/loschkylester.html" target="_blank">https://www.k-state.edu/psych/research/loschkylester.html</a></div>
<div>lab page: <a href="http://www.k-state.edu/psych/vcl/index.html" target="_blank">http://www.k-state.edu/psych/vcl/index.html</a></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>