Separate Detection of Moving Luminance and Contrast Modulations: Fact or Artifact?

@article{Smith1997SeparateDO,
  title={Separate Detection of Moving Luminance and Contrast Modulations: Fact or Artifact?},
  author={Andrew T. Smith and Timothy Ledgeway},
  journal={Vision Research},
  year={1997},
  volume={37},
  pages={45-62}
}
We have investigated first-order artifacts in second-order motion perception. Subjects were required to identify the orientation and direction of a drifting sinusoidal contrast modulation. When the carrier consisted of static two-dimensional noise, performance often reflected the use of first-order artifacts that arise from stochastic local biases in the noise, rather than the detection of the contrast modulation per se. This stimulus, which has been used widely for studying second-order motion… CONTINUE READING
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