[QUOTE=jovan]
There’s this paper: Human brain activity during spontaneously reversing perception of ambiguous figures.
"Looking at ambiguous figures results in rivalry with spontaneous alternation between two percepts. Using event-related functional magnetic resonance imaging, we localized transient human brain activity changes during perceptual reversals. Activation occurred in ventral occipital and intraparietal higher-order visual areas, deactivation in primary visual cortex and the pulvinar. Thus, without any physical stimulus changes, salient perceptual flips briefly engage widely separated specialized cortical areas, but are also associated with intermittent activity breakdown in structures putatively maintaining perceptual stability. Together, the dynamics of integrative perceptual experience are reflected in rapid spatially differentiated activity modulation within a cooperative set of neural structures. "
[/QUOTE]
Hey thanks for bringing some actual science to the question of the OP.
Unless there are any better studies out there than the one you cite, the answer to the OP is that there is no evidence a left- or right-brained person (not that such a thing exists anyway; see my and other posts, above) will see the spin differently. Underneath the floofed-up paragraph above, for instance, its just saying that perception flips can occur with internal processing that happens in different locations, even absent external stimulus changes. I think I coulda told 'em that without needing any grant money.
I wish to resolve the comments about the shadow. The shadow of the extended foot is not ambiguous; it is wrong for both rotations, but more wrong for a clockwise rotation.
The dancer is jumping. Her extended foot crosses her silhouette in the straight-on direction twice: once at the height of the jump and once when the axis foot is touching (and the axis foot shadow touches the silhouette axis foot). The axis foot shadow extends most deeply into the picture when the dancer is on the surface, and therefore the extended foot shadow will also extend most deeply into the picture at this point as well.
The light source is behind the dancer (it’s a silhouetted) and above the dancer (the thickness of the axis foot shadow is not elongated. If the light source were close to the horizon the shadow of the axis foot would be much “thicker” i.e. deeper, than the figure foot.
If the dancer is rotating clockwise, the right foot is extended, and she touches the surface with the right leg extended away from the viewer. Because it is extended away, we should see its shadow deeply into the animation since the light source is above and behind the dancer. However in the animation, at the point the axis foot meets its shadow, the extended foot shadow has disappeared. This would not be the case if the extended leg were away from the viewer.
With the dancer rotating counterclockwise, the left foot is extended, and she is at the height of her jump when the extended leg is away from the viewer. This is the point in the animation that we just see the extended leg shadow at the bottom.
Because the extended leg shadow must be at its deepest point in the picture when the dancer is on the surface and the leg is extended away from the viewer, the extended leg shadow is the most wrong when she is rotating clockwise. In the clockwise rotation, the extended right leg is away from the viewer and the dancer is on the surface, but there is no extended leg shadow at all.
Counterclockwise it is, kids.
