Neuronal nonlinearity explains greater visual spatial resolution for darks than lights.

@article{Kremkow2014NeuronalNE,
  title={Neuronal nonlinearity explains greater visual spatial resolution for darks than lights.},
  author={Jens Kremkow and Jianzhong Jin and Stanley Jose Komban and Yushi Wang and Reza Lashgari and Xiaobing Li and Michael Jansen and Qasim Zaidi and Jose-Manuel Alonso},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2014},
  volume={111 8},
  pages={
          3170-5
        }
}
Astronomers and physicists noticed centuries ago that visual spatial resolution is higher for dark than light stimuli, but the neuronal mechanisms for this perceptual asymmetry remain unknown. Here we demonstrate that the asymmetry is caused by a neuronal nonlinearity in the early visual pathway. We show that neurons driven by darks (OFF neurons) increase their responses roughly linearly with luminance decrements, independent of the background luminance. However, neurons driven by lights (ON… CONTINUE READING

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