Summation of very close spatial frequencies: the importance of spatial probability summation.

@article{Graham1987SummationOV,
  title={Summation of very close spatial frequencies: the importance of spatial probability summation.},
  author={Norma Graham and John G. Robson},
  journal={Vision research},
  year={1987},
  volume={27 11},
  pages={1997-2007}
}
In accounting for pattern thresholds it is necessary to consider probability summation (or equivalent nonlinear pooling) not only across detectors selective for different spatial frequencies but also across detectors in different spatial positions. Interestingly, calculation on this basis shows that the amount of summation between components of closely similar spatial frequency in a large grating is primarily determined by the variation in sensitivity of detectors at different spatial locations… CONTINUE READING

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