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Dear Lester
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<div class="">Concerning option 3, I agree with you about red/green or red/blue glasses. Difficult to order single versions. But all they need for a home demo are the filters . The filters are readily available from photo suppliers, theatre lighting supplies,
disco suppliers…and if all else fails Amazon.</div>
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<div class="">Andrew</div>
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<div>Andrew Parker, DPAG</div>
<div>Oxford University and St John’s College</div>
<div><a href="mailto:andrew.parker@dpag.ox.ac.uk" class="">andrew.parker@dpag.ox.ac.uk</a></div>
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<div class="">On 21 Mar 2020, at 02:45, Lester Loschky <<a href="mailto:loschky@ksu.edu" class="">loschky@ksu.edu</a>> wrote:</div>
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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>
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<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 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 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 class="">For the related phenomenon of motion parallax, "wiggle vision" is a very nice demonstration:</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 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>
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<div class="">Les</div>
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<div class="">Lester Loschky</div>
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<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>
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<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: <a href="mailto:loschky@ksu.edu" target="_blank" class="">loschky@ksu.edu</a></div>
<div class="">research page: <a href="https://www.k-state.edu/psych/research/loschkylester.html" target="_blank" class="">https://www.k-state.edu/psych/research/loschkylester.html</a></div>
<div class="">lab page: <a href="http://www.k-state.edu/psych/vcl/index.html" target="_blank" class="">http://www.k-state.edu/psych/vcl/index.html</a></div>
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