<div dir="ltr">Fascinating, Martin!  I never knew of monocular stereopsis.  Thanks for sharing!<div><br></div><div>Best wishes,</div><div><br></div><div>Les</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 21, 2020 at 3:21 AM Maarten Wijntjes - IO <<a href="mailto:M.W.A.Wijntjes@tudelft.nl">M.W.A.Wijntjes@tudelft.nl</a>> wrote:<br></div><blockquote class="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 it could be the right moment to discuss <b>monocular stereopsis</b>. Check Ames’ publication about this, he offers various solutions, not all easily achievable at home but looking through an
<b>aperture</b> should work. Off course a <b>synopter</b> (not mentioned by Ames) would have been great, so after the pandemic you should order some with me ;)<span style="color:rgb(51,51,51);font-family:"Segoe UI Emoji";background-color:rgb(255,255,255)">. </span>What
 is cool and doable is looking through a make-up mirror to a picture on your smart phone (or a postcard, if available). It gives the effect of a snapscope and is related to the zograscope and graphoscope (which you can also simulate by looking through a big
 loupe).
<div><br>
</div>
<div>Off course the <b>Pulfrich effect</b> is easily demonstrated if  students have sunglasses ate hand.
<div><br>
</div>
<div>About the <b>3D Wiggle</b>: I remember I once saw a museum website where visitors could help converting the 3D photo collection into GIFs that show the wiggle effect. It is quite essential to get the alignment right otherwise you get
 headache GIFs. But I could not find the website… would be a nice pastime now.</div>
<div><br>
</div>
<div>Good luck!</div>
<div>Maarten<br>
<div>
<div><br>
</div>
<div>References</div>
<div><span style="background-color:rgb(255,255,255)"><font color="#222222" face="Arial, sans-serif" size="2">Ames, A. (1925). The illusion of depth from single pictures. JOSA, 10(2), 137-148.</font></span></div>
<div><span style="background-color:rgb(255,255,255)"><font color="#222222" face="Arial, sans-serif" size="2"><br>
</font></span></div>
<div><span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">Vishwanath, D., & Hibbard, P. B. (2013). Seeing in 3-D with just one eye: Stereopsis
 without binocular vision. </span><i style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px">Psychological science</i><span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">, </span><i style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px">24</i><span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">(9),
 1673-1685.</span></div>
<div><font color="#222222" face="Arial, sans-serif" size="2"><span style="background-color:rgb(255,255,255)"><br>
</span></font></div>
<div><span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">Koenderink, J.J., Wijntjes, M.W.A., & van Doorn, A.J. (2013). Zograscopic viewing. </span><i style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px">i-Perception</i><span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">, </span><i style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px">4</i><span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">(3),
 192-206.</span></div>
<div><font color="#222222" face="Arial, sans-serif" size="2"><span style="background-color:rgb(255,255,255)"><br>
</span></font>
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<div>On 21 Mar 2020, at 05:50, Christopher Tyler via cvnet <<a href="mailto:cvnet@lawton.ewind.com" target="_blank">cvnet@lawton.ewind.com</a>> wrote:</div>
<br>
<div>
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You could try autostereograms, such as the examples on my<span> </span><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.scholarpedia.org_article_Autostereogram&d=DwMFaQ&c=XYzUhXBD2cD-CornpT4QE19xOJBbRy-TBPLK0X9U2o8&r=fQ0XK5AoJ5yykeTTnr8PjdayWWrISW6iZef_0J7eSMc&m=A7nkuIaBYQrSpjCwOyL_vQcGXVWxKn9KtWM-SXsJ8I8&s=vhRKNtTW7PCWLmi9NbPxhzHa8gHdOhrtuzHzu1q1ulo&e=" 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>
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<div dir="ltr" class="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>
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<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="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.well.com_user_jimg_stereo_stereo-5Fgate.html&d=DwMFaQ&c=XYzUhXBD2cD-CornpT4QE19xOJBbRy-TBPLK0X9U2o8&r=fQ0XK5AoJ5yykeTTnr8PjdayWWrISW6iZef_0J7eSMc&m=A7nkuIaBYQrSpjCwOyL_vQcGXVWxKn9KtWM-SXsJ8I8&s=HPwhVQhqtG4Yp0wJsSQQ9jptwIKGmGCMdFA2BuzlVjc&e=" target="_blank">http://www.well.com/user/jimg/stereo/stereo_gate.html</a></div>
</div>
<div><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.3dwiggle.com_2016_06_28_5-2Dwigglegrams-2Dyou-2Dneed-2Dto-2Dsee-2Dbefore-2Dyou-2Ddie_&d=DwMFaQ&c=XYzUhXBD2cD-CornpT4QE19xOJBbRy-TBPLK0X9U2o8&r=fQ0XK5AoJ5yykeTTnr8PjdayWWrISW6iZef_0J7eSMc&m=A7nkuIaBYQrSpjCwOyL_vQcGXVWxKn9KtWM-SXsJ8I8&s=R5_kk7lER-Zb8bPIW9Hc-1e1ZY99D-l6y-2A80jkSiQ&e=" 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>
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<div>Best wishes,</div>
<div><br>
</div>
<div>Les</div>
--<span> </span><br>
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<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:<span> </span><a href="mailto:loschky@ksu.edu" target="_blank">loschky@ksu.edu</a></div>
<div>research page: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.k-2Dstate.edu_psych_research_loschkylester.html&d=DwMFaQ&c=XYzUhXBD2cD-CornpT4QE19xOJBbRy-TBPLK0X9U2o8&r=fQ0XK5AoJ5yykeTTnr8PjdayWWrISW6iZef_0J7eSMc&m=A7nkuIaBYQrSpjCwOyL_vQcGXVWxKn9KtWM-SXsJ8I8&s=JGHw_GKKB1Ph3fNYWUtFSsHL1uXmuntPqdkzyeJj_mE&e=" target="_blank">https://www.k-state.edu/psych/research/loschkylester.html</a></div>
<div>lab page: <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.k-2Dstate.edu_psych_vcl_index.html&d=DwMFaQ&c=XYzUhXBD2cD-CornpT4QE19xOJBbRy-TBPLK0X9U2o8&r=fQ0XK5AoJ5yykeTTnr8PjdayWWrISW6iZef_0J7eSMc&m=A7nkuIaBYQrSpjCwOyL_vQcGXVWxKn9KtWM-SXsJ8I8&s=OkMzh7Z8mw-EU_qOkon63NKVE2SZbyeu5l0wAwoMSGs&e=" target="_blank">http://www.k-state.edu/psych/vcl/index.html</a></div>
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<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="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>