How does the brain interpret our 3-D world when we switch eye inputs?

Discussion in 'Human Science' started by matthew809, Jul 12, 2016.

  1. matthew809 Registered Senior Member

    Messages:
    480
    3-D vision is an abstraction that our brain recreates in our heads from 2 different 2-D images(left and right eye). The brain processes the deviations between each image to make a best guess at how the world around it should be perceived, in 3-D. So what happens when those separate images are artificially switched before entering our eyes(ie. from using 3-D goggles). Our brain is still receiving the same images, but the expected parallax deviation is reversed in each eye. How does the brain interpret what it sees? I assume that there have been many experiments done on this.
     
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  3. DaveC426913 Valued Senior Member

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    Yes. It is very hard to resolve, since the eyes will continually go out-of-sync, resulting in double-vision, but if you can hold on to it for a while, it looks lke things are inverted. Big things are far away, small things are nearby.

    Don't forget, one confounding (or mitigating) factor: you can only focus on one small spot at a time, so everything outisde that focus will appear double.

    Some photo forums I frequent post their pics in 3D format - one pic with 2 images side-by-side, each from slightly different angles.

    There's two ways to do this:
    1] "wall-eyed" - your sightlines from each eye are parallel (left eye sees left pic, right eyes see right pic)
    2] "cross-eyed" - your sightlines cross (left eye sees right pic, right eyes sees left pic)

    They prefer cross-eyed for some reason. So they put the left-eyed mage on the right of the pic, and the right-eyed pic on the left.

    I grew up with wall-eyed, so when I look at their pix, they look sort of inside out. It's very difficult for me to employ the cross-eyed method.
     
    Last edited: Jul 13, 2016
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