Line-separation discrimination curve in the human fovea: smooth or segmented?

@article{Westheimer1984LineseparationDC,
  title={Line-separation discrimination curve in the human fovea: smooth or segmented?},
  author={Gerald Westheimer},
  journal={Journal of the Optical Society of America. A, Optics and image science},
  year={1984},
  volume={1 6},
  pages={683-4}
}
Because the discriminability of spatial intervals may give a pointer to possible underlying detection mechanisms for hyperacuity, a careful measurement was undertaken of how this function behaves with the width of the spatial intervals in the 6- to 12-min-of-arc range. Data on two subjects failed to produce convincing evidence for significant segmentation in the line-separation discrimination curve. 

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