The double-nail illusion: experiments on binocular vision with nails, needles, and pins.

@article{Krol1980TheDI,
  title={The double-nail illusion: experiments on binocular vision with nails, needles, and pins.},
  author={Jane Krol and Wim A. van de Grind},
  journal={Perception},
  year={1980},
  volume={9 6},
  pages={
          651-69
        }
}
When two nails or similar slender objects are held straight ahead at reading distance, one a few centimetres behind the other and aligned at the same eye level, they are seen side by side rather than one behind the other. A quantitative study of this 'double-nail' illusion shows that the objects are judged to be at the positions of the so-called apparent or ghost images known from fusional theories of stereopsis. Most recent fusional theories assume that apparent images are suppressed by… CONTINUE READING
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