Perception of first- and second-order motion: separable neurological mechanisms?

@article{Vaina1999PerceptionOF,
  title={Perception of first- and second-order motion: separable neurological mechanisms?},
  author={Lucia M. Vaina and Alan Cowey and Donald Kennedy},
  journal={Human brain mapping},
  year={1999},
  volume={7 1},
  pages={67-77}
}
An unresolved issue in visual motion perception is how distinct are the processes underlying "first-order" and "second-order" motion. The former is defined by spatiotemporal variations of luminance and the latter by spatiotemporal variations in other image attributes, such as contrast or depth. Here we describe two neurological patients with focal unilateral lesions whose contrasting perceptual deficits on psychophysical tasks of "first-order" and "second-order" motion are related to the maps… CONTINUE READING

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