The Ponzo illusion affects grip-force but not grip-aperture scaling during prehension movements.

@article{Jackson2000ThePI,
  title={The Ponzo illusion affects grip-force but not grip-aperture scaling during prehension movements.},
  author={Stephen R. Jackson and Andrew Shaw},
  journal={Journal of experimental psychology. Human perception and performance},
  year={2000},
  volume={26 1},
  pages={418-23}
}
Contextual cues such as linear perspective and relative size can exert a powerful effect on the perception of objects. This fact is demonstrated by the illusory effects that can be induced by such cues (e.g., the Ponzo railway track and Titchener circles illusions). Several recent studies have reported, however, that visual illusions based on such cues have little or no influence on the visuomotor mechanisms used to guide hand action. Furthermore, evidence of this sort has been cited in support… CONTINUE READING

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