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In addition it could be the right moment to discuss <b class="">monocular stereopsis</b>. Check Ames’ publication about this, he offers various solutions, not all easily achievable at home but looking through an
<b class="">aperture</b> should work. Off course a <b class="">synopter</b> (not mentioned by Ames) would have been great, so after the pandemic you should order some with me ;)<span style="caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); font-family: "Segoe UI Emoji"; background-color: rgb(255, 255, 255);" class="">. </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).
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<div class="">Off course the <b class="">Pulfrich effect</b> is easily demonstrated if students have sunglasses ate hand.
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<div class="">About the <b class="">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>
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<div class="">Good luck!</div>
<div class="">Maarten<br class="">
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<div class="">References</div>
<div class=""><span style="background-color: rgb(255, 255, 255); caret-color: rgb(34, 34, 34);" class=""><font color="#222222" face="Arial, sans-serif" size="2" class="">Ames, A. (1925). The illusion of depth from single pictures. JOSA, 10(2), 137-148.</font></span></div>
<div class=""><span style="background-color: rgb(255, 255, 255); caret-color: rgb(34, 34, 34);" class=""><font color="#222222" face="Arial, sans-serif" size="2" class=""><br class="">
</font></span></div>
<div class=""><span style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);" class="">Vishwanath, D., & Hibbard, P. B. (2013). Seeing in 3-D with just one eye: Stereopsis
without binocular vision. </span><i style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px;" class="">Psychological science</i><span style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);" class="">, </span><i style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px;" class="">24</i><span style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);" class="">(9),
1673-1685.</span></div>
<div class=""><font color="#222222" face="Arial, sans-serif" size="2" class=""><span style="caret-color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);" class=""><br class="">
</span></font></div>
<div class=""><span style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);" class="">Koenderink, J.J., Wijntjes, M.W.A., & van Doorn, A.J. (2013). Zograscopic viewing. </span><i style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px;" class="">i-Perception</i><span style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);" class="">, </span><i style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px;" class="">4</i><span style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);" class="">(3),
192-206.</span></div>
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</span></font>
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<div class="">On 21 Mar 2020, at 05:50, Christopher Tyler via cvnet <<a href="mailto:cvnet@lawton.ewind.com" class="">cvnet@lawton.ewind.com</a>> wrote:</div>
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You could try autostereograms, such as the examples on my<span class="Apple-converted-space"> </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=" class="">Scholarpedia
page</a>. Not everyone can get them, but they're pretty effective for those who can.
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<div class="">All the best,</div>
<div class="">Christopher</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" class="">loschky@ksu.edu</a>> wrote:<br class="">
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<div dir="ltr" class="">Hi Everybody,
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<div class="">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>
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<div class="">As preface, the following are methods I have used in in-person classes to demonstrate stereo vision:</div>
<div class="">
<ol class="">
<li class="">an actual stereoscope and example stereoimages to share with students (including the classic Julesz square tile random-dot-stereogram image)<br class="">
</li><li class="">example stereoscopic lenticular lens images to share with students</li><li class="">red/green anaglyph images with sets of cardboard & plastic red/green anaglyph glasses<br class="">
</li><li class="">Google Cardboard plus cell phone to share with students</li><li class="">random dot autosterographic images</li><li class="">touching two pen tips together using two eyes versus one eye</li><li class="">learning about crossed vs. uncrossed disparity using two fingers at different distances</li></ol>
<div class="">Unfortunately, my students don't uniformly have access to the apparatuses required for 1-4 above. </div>
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<div class="">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>
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<div class="">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>
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<div class="">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>
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</div>
<div class="">#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>
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</div>
<div class="">#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>
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<div class="">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>
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</div>
<div class="">For the related phenomenon of motion parallax, "wiggle vision" is a very nice demonstration:</div>
<div class="">
<div class=""><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" class="">http://www.well.com/user/jimg/stereo/stereo_gate.html</a></div>
</div>
<div class=""><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" class="">https://www.3dwiggle.com/2016/06/28/5-wigglegrams-you-need-to-see-before-you-die/</a><br class="">
</div>
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<div class="">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>
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</div>
<div class="">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>
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<div class="">Any other suggestions would be appreciated. </div>
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<div class="">Best wishes,</div>
<div class=""><br class="">
</div>
<div class="">Les</div>
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<div class="">Lester Loschky</div>
<div class="">
<div class="">Professor</div>
<div class="">Associate Director, Cognitive and Neurobiological Approaches to Plasticity Center<br class="">
Department of Psychological Sciences<br class="">
471 Bluemont Hall</div>
<div class="">
<div class="">1114 Mid-Campus Dr North</div>
Kansas State University<br class="">
Manhattan, KS <span style="font-size: 10pt; font-family: Helvetica;" class="">66506-5302</span> </div>
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<div class="">email:<span class="Apple-converted-space"> </span><a href="mailto:loschky@ksu.edu" target="_blank" class="">loschky@ksu.edu</a></div>
<div class="">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" class="">https://www.k-state.edu/psych/research/loschkylester.html</a></div>
<div class="">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" class="">http://www.k-state.edu/psych/vcl/index.html</a></div>
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