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The Right Brain vs Left Brain test - Optical Illusion
The Right Brain vs Left Brain test - Optical Illusion
Published: 2008/06/04
Channel: 1cebergslim
Optical Illusion what way is the girl spinning??
Optical Illusion what way is the girl spinning??
Published: 2010/03/17
Channel: GAMS1981
'solution' for spinning dancer girl illusion - defined for both directions
Published: 2009/01/02
Channel: peter wassink
SPINNING BALLERINA ILLUSION
SPINNING BALLERINA ILLUSION
Published: 2011/02/28
Channel: VOD102
This video showes a spinning dancer (or any silhouette)  can rotate both ways.
This video showes a spinning dancer (or any silhouette) can rotate both ways.
Published: 2012/04/27
Channel: Dynamic optical/visual illusions
dancing ballerina / spinning dancer optical illusion made easy.
dancing ballerina / spinning dancer optical illusion made easy.
Published: 2012/07/23
Channel: youchewb
The spinning silhouette illusion (aka the spinning dancer illusion)
The spinning silhouette illusion (aka the spinning dancer illusion)
Published: 2012/11/07
Channel: eChalk
Pump Turns Tutorial A La Seconde Dance Spin
Pump Turns Tutorial A La Seconde Dance Spin
Published: 2011/02/17
Channel: fitforafeast
Silhouette Optical Illusion
Silhouette Optical Illusion
Published: 2012/05/06
Channel: Interval Magic
Ballet: Spin Cycle
Ballet: Spin Cycle
Published: 2007/02/19
Channel: AnaheimBallet
Improved
Improved 'solution' for spinning dancer girl illusion - alternating directions
Published: 2011/06/30
Channel: peter wassink
These spinning dancers don
These spinning dancers don't rotate or?? Control of perception. Symmetric silhouette illusion.
Published: 2012/09/06
Channel: Dynamic optical/visual illusions
egypt spinning dancer beautifull hurghada
egypt spinning dancer beautifull hurghada
Published: 2011/12/12
Channel: Damiro Don
Hip Hop Spin Class with KTX
Hip Hop Spin Class with KTX
Published: 2014/01/31
Channel: Marty Kaan
The rebellious spinning dancer. Are these dancers spinning or not?
The rebellious spinning dancer. Are these dancers spinning or not?
Published: 2013/06/21
Channel: Dynamic optical/visual illusions
Spinning Dance- Be One Cycling Studio (Big Bang- Fantastic baby)
Spinning Dance- Be One Cycling Studio (Big Bang- Fantastic baby)
Published: 2015/07/11
Channel: Be One Cycling Studio
Spinnig Dancer illusion - visual explanation
Spinnig Dancer illusion - visual explanation
Published: 2015/02/26
Channel: Artur Piel
8 Mind-Blowing Optical Illusions
8 Mind-Blowing Optical Illusions
Published: 2016/11/13
Channel: SciShow
Are You Right-Brained Or Left-Brained?
Are You Right-Brained Or Left-Brained?
Published: 2013/12/10
Channel: BuzzFeedVideo
Spinning Dancer - Explanation
Spinning Dancer - Explanation
Published: 2016/11/23
Channel: Morgan Webber
Orlando Turkish Festival  Whirling Dervish Dancers
Orlando Turkish Festival Whirling Dervish Dancers
Published: 2010/04/26
Channel: Bruce Grossman
Egyptian Tanoura (Spinning) Dancer
Egyptian Tanoura (Spinning) Dancer
Published: 2014/01/30
Channel: Tamer Gouda
what does THIS dancer say about YOU? (featured on YouTube)
what does THIS dancer say about YOU? (featured on YouTube)
Published: 2007/10/16
Channel: jyris1
HQ Spinning Dancer illusion (Brain-test).flv
HQ Spinning Dancer illusion (Brain-test).flv
Published: 2011/03/15
Channel: SiCPsychology
which way is the dancer spinning??
which way is the dancer spinning??
Published: 2008/01/21
Channel: Alina I
Dancer Optical illusion
Dancer Optical illusion
Published: 2012/09/29
Channel: melarafam04
The symmetric spinning dancer is not just a spinning dancer. Symmetric sihouette.
The symmetric spinning dancer is not just a spinning dancer. Symmetric sihouette.
Published: 2013/11/10
Channel: Dynamic optical/visual illusions
The Best Optical Illusion Spinning Girl
The Best Optical Illusion Spinning Girl
Published: 2015/02/28
Channel: Klever hends
Silhouette Illusion Spinning Dancer.avi
Silhouette Illusion Spinning Dancer.avi
Published: 2013/02/12
Channel: maximpje2307
Spinning dancer- Arabian Nights 02/06/2015
Spinning dancer- Arabian Nights 02/06/2015
Published: 2015/06/02
Channel: JMMora92
spinning girl illusion - spinning girl optical illusions
spinning girl illusion - spinning girl optical illusions
Published: 2011/11/26
Channel: mreyeillusion
Lee Brice - I Don
Lee Brice - I Don't Dance (Official Music Video)
Published: 2014/04/16
Channel: Lee Brice
SPINNING BALLERINA ILLUSION
SPINNING BALLERINA ILLUSION
Published: 2015/03/23
Channel: Anmol Gupta
Spinning Dancer
Spinning Dancer
Published: 2014/11/21
Channel: Audiopedia
Spinning Dancer
Spinning Dancer
Published: 2015/11/17
Channel: Brive 1987
Spinning Dancer
Spinning Dancer
Published: 2011/06/06
Channel: ImamSuyuthi1
The Spinning Dancer´s Chairs
The Spinning Dancer´s Chairs
Published: 2011/03/09
Channel: Julio Pacheco Rivas
Curvy Hoopers Challenge 2015 Spinning Dancer
Curvy Hoopers Challenge 2015 Spinning Dancer
Published: 2015/01/24
Channel: The Spinning Dancer
Rotating or oscillating symmetric spinning dancers. Symmetric silhouette illusion.
Rotating or oscillating symmetric spinning dancers. Symmetric silhouette illusion.
Published: 2012/12/17
Channel: Dynamic optical/visual illusions
Pole Dance Moves - Beginner Level - Spinning Pole
Pole Dance Moves - Beginner Level - Spinning Pole
Published: 2016/06/24
Channel: BURDAGRIN
Optical Illusions - Which Direction Are They Spinning?
Optical Illusions - Which Direction Are They Spinning?
Published: 2011/11/23
Channel: IQTESTPRO
wawa the spinning dancer
wawa the spinning dancer
Published: 2009/08/16
Channel: chommot
Are the silhouettes following the change of movement of the middle dancer? Spinning dancer illusion.
Are the silhouettes following the change of movement of the middle dancer? Spinning dancer illusion.
Published: 2013/03/22
Channel: Dynamic optical/visual illusions
Dakota Fox - Spinning Pole demonstration (Beginner techniques)
Dakota Fox - Spinning Pole demonstration (Beginner techniques)
Published: 2011/04/14
Channel: foxxyauthority
Spinning dancer at Desert Party in Hurghada, Egypt: April 2010
Spinning dancer at Desert Party in Hurghada, Egypt: April 2010
Published: 2010/06/03
Channel: Chris Morsey
Crazy spinning dancer
Crazy spinning dancer
Published: 2009/11/08
Channel: Tim Duffy
Spinning Wheel of Wire and Light Creates a Dancing Ballerina Illusion (Storyful, Inspiring)
Spinning Wheel of Wire and Light Creates a Dancing Ballerina Illusion (Storyful, Inspiring)
Published: 2016/07/03
Channel: Storyful
Spinning Dancer III
Spinning Dancer III
Published: 2009/12/06
Channel: sebastianexploratori
Musical Chalet with Spinning Dancer 1 Day Cuckoo Clock
Musical Chalet with Spinning Dancer 1 Day Cuckoo Clock
Published: 2016/09/05
Channel: John Tuinenga
2015/16 (259) - Spinning Dancer (勁勇威龍) - 湛明諾 (27倍)
2015/16 (259) - Spinning Dancer (勁勇威龍) - 湛明諾 (27倍)
Published: 2015/12/17
Channel: hkmashing
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Clockwise or Counterclockwise
Left or Right

The Spinning Dancer, also known as the silhouette illusion, is a kinetic, bistable optical illusion resembling a pirouetting female dancer. The illusion, created in 2003 by web designer Nobuyuki Kayahara,[1][2] involves the apparent direction of motion of the figure. Some observers initially see the figure as spinning clockwise (viewed from above) and some counterclockwise. Additionally, some may see the figure suddenly spin in the opposite direction.[2]

The illusion derives from the lack of visual cues for depth. For instance, as the dancer's arms move from viewer's left to right, it is possible to view her arms passing between her body and the viewer (that is, in the foreground of the picture, in which case she would be circling counterclockwise on her right foot) and it is also possible to view her arms as passing behind the dancer's body (that is, in the background of the picture, in which case she is seen circling clockwise on her left foot).

When she is facing to the left or to the right, her breasts and ponytail clearly define the direction she is facing, although there is ambiguity in which leg is which. However, as she moves away from facing to the left (or from facing to the right), the dancer can be seen (by different viewers, not by a single individual) facing in either of two directions. At first, these two directions are fairly close to each other (both left, say, but one facing slightly forward, the other facing slightly backward) but they become further and further away from each other until we reach a position where her ponytail and breasts are in line with the viewer (so that neither her breasts nor her ponytail are seen so readily). In this position, she could be facing either away from the viewer or towards the viewer, so that the two positions the two different viewers could see are 180 degrees apart.

Psychology of visual perception[edit]

It has been established that the silhouette is more often seen rotating clockwise than counterclockwise. According to an online survey of over 1600 participants, approximately two thirds of observers initially perceived the silhouette to be rotating clockwise. In addition, observers who initially perceived a clockwise rotation had more difficulty experiencing the alternative.[3]

This positron emission tomography scan of a woman has a similar effect when viewed spinning

These results can be explained by a psychological study providing evidence for a viewing-from-above bias that influences observers' perceptions of the silhouette.[4][5] Kayahara's dancer is presented with a camera elevation slightly above the horizontal plane. Consequently, the dancer may also be seen from above or below in addition to spinning clockwise or counterclockwise, and facing toward or away from the observer. Upon inspection, one may notice that in Kayahara's original illusion, seeing the dancer spin clockwise is paired with constantly holding an elevated viewpoint and seeing the dancer from above. The opposite is also true; an observer maintaining an anti-clockwise percept has assumed a viewpoint below the dancer. If observers report perceiving Kayahara's original silhouette as spinning clockwise more often than counterclockwise, there are two chief possibilities. They may have a bias to see it spinning clockwise, or they may have a bias to assume a viewpoint from above. To tease these two apart, the researchers created their own versions of Kayahara's silhouette illusion by recreating the dancer and varying the camera elevations. This allowed for clockwise/from-above (like Kayahara's original) and clockwise/from-below pairings. The results indicated that there was no clockwise bias, but rather viewing-from-above bias. Furthermore, this bias was dependent upon camera elevation. In other words, the greater the camera elevation, the more often an observer saw the dancer from above.The way that this illusion is perceived is entirely down to which leg you see the dancer as standing on. If she stands on her right leg, she spins anticlockwise. If she stands on her left leg, she spins clockwise. This is a more important factor in interpreting her motion than the viewpoint.

In popular psychology, the illusion has been incorrectly[6] identified as a personality test that supposedly reveals which hemisphere of the brain is dominant in the observer. Under this wrong interpretation, it has been popularly called the Right Brain–Left Brain test,[7] and was widely circulated on the Internet during late 2008 to early 2009.[8]

A recent[when?]publication describes the brain activation related to the switching of perception. Utilizing fMRI in a volunteer capable to switch at will the direction of rotation, it was found that a part of the right parietal lobe is responsible for the switching. More interestingly, the authors relate this brain activation to the recently described Spontaneous Brain Fluctuations.[9]

Bistable perception[edit]

There are other optical illusions that depend on the same or a similar kind of visual ambiguity known as multistable, in that case bistable, perception. One example is the Necker Cube.

Depending on the perception of the observer, the apparent direction of spin may change any number of times, a typical feature of so-called bistable percepts such as the Necker cube which may be perceived from time to time as seen from above or below. These alternations are spontaneous and may randomly occur without any change in the stimulus or intention by the observer. However some observers may have difficulty perceiving a change in motion at all.

One way of changing the direction perceived is to use averted vision and mentally look for an arm going behind instead of in front, then carefully move the eyes back. Some may perceive a change in direction more easily by narrowing visual focus to a specific region of the image, such as the spinning foot or the shadow below the dancer and gradually looking upwards. One can also try to tilt one's head to perceive a change in direction. Another way is to watch the base shadow foot, and perceive it as the toes always pointing away from you and it can help with direction change. You can also close your eyes and try and envision the dancer going in a direction then reopen them and the dancer should change directions. Still another way is to wait for the dancer's legs to cross in the projection and then try to perceive a change in the direction in what follows. You could also try using your peripheral vision to distract the dominant part of the brain, slowly look away from the ballerina and you may begin to see it spin in the other direction. Perhaps the easiest method is to blink rapidly (slightly varying the rate if necessary) until consecutive images are going in the 'new' direction. Then open your eyes and the new rotational direction is maintained. It is even possible to see the illusion in a way that the dancer is not spinning at all, but simply rotating back and forth 180 degrees.

Slightly altered versions of the animation have been created with an additional visual cue to assist viewers who have difficulty 'seeing' one rotation direction or the other. Labels and white edges have been added to the legs, to make it clear which leg is passing in front of the other. (see below) Looking at one of these can sometimes then make the original dancer image above spin in the corresponding direction.

Further analysis[edit]

A frame-by-frame wide version of the Spinning Dancer. To create this image, the original was split into its 34 constituent frames, and a horizontal panorama was created from those frames.

References[edit]

  1. ^ Nobuyuki Kayahara's website
  2. ^ a b Parker-Pope, Tara (2008-04-28). "The Truth About the Spinning Dancer". Well Blog. The New York Times. Retrieved 2008-08-07. 
  3. ^ "Casual Fridays: TK-421, why can't you spin that woman in reverse?". Cognitive Daily. 2008-10-10. Retrieved 2009-07-04. 
  4. ^ Troje N F, McAdam M (2010-11-14). "The viewing-from-above bias and the silhouette illusion" (PDF). i-Perception 1(3) 143-148. Retrieved 2010-11-14. 
  5. ^ Kattinakere, Ragu (2008-02-03). "Spinning lady explained". Retrieved 2008-02-03. 
  6. ^ Novella, Steven (2007-10-11). "Left Brain - Right brain and the Spinning Girl". NeuroLogica Blog. Retrieved 2008-08-07. 
  7. ^ "The Right Brain vs Left Brain test". PerthNow. The Sunday Times. 2007-09-26. Retrieved 2008-08-07. 
  8. ^ "Which side of your brain is more dominant?". Retrieved 2014-02-23. 
  9. ^ Bernal B, Guillen M, Marquez J. The spinning dancer illusion and spontaneous brain fluctuations: an fMRI study. Neurocase. 2014;20:627-39.

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