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<p>You can also just make your own filters with clear plastic (e.g.
from food cartons) and permanent markers, making paper/cardboard
lens holders Can also often find different color plastic in the
recycle bin.. E.g. might find green plastic from saint patty's
day (or soda bottles) and red plastic from a valentines box
wrapping. Plenty of DIY instructions on the net<br>
</p>
<p><br>
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<div class="moz-cite-prefix">On 3/22/2020 5:30 AM, Andrew Parker
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:C2E90886-1977-45B8-A218-DAD2EED83835@dpag.ox.ac.uk">
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Dear Lester
<div class=""><br class="">
</div>
<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>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Andrew</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
<div class="">
<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=""
moz-do-not-send="true">andrew.parker@dpag.ox.ac.uk</a></div>
<div class=""><br class="">
</div>
<br class="Apple-interchange-newline">
</div>
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 21 Mar 2020, at 02:45, Lester Loschky <<a
href="mailto:loschky@ksu.edu" class=""
moz-do-not-send="true">loschky@ksu.edu</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
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<div dir="ltr" class="">
<div dir="ltr" class="">
<div dir="ltr" class="">
<div dir="ltr" class="">Hi Everybody,
<div class=""><br class="">
</div>
<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>
<div class=""><br class="">
</div>
<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>
<div class=""><br class="">
</div>
<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>
</div>
<div class=""><br class="">
</div>
<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>
<div class=""><br class="">
</div>
<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>
<div class=""><br class="">
</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>
<div class=""><br class="">
</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>
<div class=""><br class="">
</div>
<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>
<div class=""><br class="">
</div>
<div class="">For the related phenomenon of
motion parallax, "wiggle vision" is a very
nice demonstration:</div>
<div class="">
<div class=""><a
href="http://www.well.com/user/jimg/stereo/stereo_gate.html"
class="" moz-do-not-send="true">http://www.well.com/user/jimg/stereo/stereo_gate.html</a></div>
</div>
<div class=""><a
href="https://www.3dwiggle.com/2016/06/28/5-wigglegrams-you-need-to-see-before-you-die/"
class="" moz-do-not-send="true">https://www.3dwiggle.com/2016/06/28/5-wigglegrams-you-need-to-see-before-you-die/</a><br
class="">
</div>
<div class=""><br class="">
</div>
<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>
<div class=""><br class="">
</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>
<div class=""><br class="">
</div>
<div class="">Any other suggestions would be
appreciated. </div>
<div class=""><br class="" clear="all">
<div class="">Best wishes,</div>
<div class=""><br class="">
</div>
<div class="">Les</div>
-- <br class="">
<div dir="ltr" class="gmail_signature">
<div dir="ltr" class="">
<div class="">
<div dir="ltr" class="">
<div class="">
<div dir="ltr" class="">
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<div dir="ltr" class="">
<div dir="ltr" class="">
<div dir="ltr" class="">
<div dir="ltr"
class="">
<div dir="ltr"
class="">
<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>
</div>
<div class="">email:
<a
href="mailto:loschky@ksu.edu"
target="_blank" class="" moz-do-not-send="true">loschky@ksu.edu</a></div>
<div class="">research
page: <a
href="https://www.k-state.edu/psych/research/loschkylester.html"
target="_blank" class="" moz-do-not-send="true">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="" moz-do-not-send="true">http://www.k-state.edu/psych/vcl/index.html</a></div>
</div>
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</blockquote>
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<pre class="moz-signature" cols="72">--
Terrance E. Boult, Cell: (719)963-0573
El Pomar Prof. of Innovation and Security & Co-director Bachelor of Innovation
U. Colorado at Colorado Springs
IEEE Fellow</pre>
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