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Dissociable Processes for Orientation Discrimination Learning and Contextual Illusion Magnitude

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  • Charlotte Elizabeth Holmes Wilks
  • Geraint Rees
  • Dietrich Samuel Schwarzkopf

Abstract

Previous research suggests an inverse relationship between human orientation discrimination sensitivity and tilt illusion magnitude. To test whether these perceptual functions are inherently linked, we measured both orientation discrimination sensitivity and the magnitude of the tilt illusion before and after participants had been trained for three days on an orientation discrimination task. Discrimination sensitivity improved with training and this improvement remained one month after the initial learning. However, tilt illusion magnitude remained unchanged before and after orientation training, at either trained or untrained orientations. Our results suggest that orientation discrimination sensitivity and illusion magnitude are not inherently linked. They also provide further evidence that, at least for the training periods we employed, perceptual learning of orientation discrimination may involve high-level processes.

Suggested Citation

  • Charlotte Elizabeth Holmes Wilks & Geraint Rees & Dietrich Samuel Schwarzkopf, 2014. "Dissociable Processes for Orientation Discrimination Learning and Contextual Illusion Magnitude," PLOS ONE, Public Library of Science, vol. 9(7), pages 1-12, July.
    • Handle: RePEc:plo:pone00:0103121
    DOI: 10.1371/journal.pone.0103121
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    References listed on IDEAS

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    1. D Samuel Schwarzkopf & Geraint Rees, 2013. "Subjective Size Perception Depends on Central Visual Cortical Magnification in Human V1," PLOS ONE, Public Library of Science, vol. 8(3), pages 1-12, March.
    2. Chen Song & Dietrich S. Schwarzkopf & Geraint Rees, 2013. "Variability in visual cortex size reflects tradeoff between local orientation sensitivity and global orientation modulation," Nature Communications, Nature, vol. 4(1), pages 1-10, October.
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