Perceived speed of moving two-dimensional patterns.

@article{Ferrera1991PerceivedSO,
  title={Perceived speed of moving two-dimensional patterns.},
  author={Vincent P. Ferrera and Hugh R. Wilson},
  journal={Vision research},
  year={1991},
  volume={31 5},
  pages={877-93}
}
When two cosine gratings drifting in different directions are superimposed they can form a coherently moving two-dimensional pattern (plaid) whose resultant speed is related to the component velocities by a geometric construction known as the intersection-of-constraints (IOC). When measured against a standard which has the same spatial frequency as its components, a plaid always appears to move slower than the IOC prediction. However, the perceived speed is generally faster than would be… CONTINUE READING

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