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Rhythmic beta-frequency TMS over human right parietal cortex strengthens visual size illusions.

Xue Han1,2, Chao Wang1,2, Lihong Chen3,4

  • 1Research Center of Brain and Cognitive Neuroscience, Liaoning Normal University, Dalian, 116029, China.

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|February 7, 2025
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Summary

Parietal beta oscillations causally influence visual size perception, enhancing Ebbinghaus and Ponzo illusions. Right parietal stimulation at beta frequency, but not theta, altered illusion magnitudes, highlighting the role of beta oscillations in visual processing.

Keywords:
Beta oscillationEbbinghaus illusionPonzo illusionSuperior parietal lobuleTMS

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Rhythmic brain activity is theorized to organize visual processing.
  • Context-dependent visual size perception is susceptible to illusions like Ebbinghaus and Ponzo.

Purpose of the Study:

  • To investigate the causal role of parietal beta oscillations in visual size perception.
  • To determine if right or left parietal stimulation affects Ebbinghaus and Ponzo illusions.

Main Methods:

  • Rhythmic transcranial magnetic stimulation (TMS) applied to the superior parietal lobule at beta (20 Hz) or theta (5 Hz) frequencies.
  • Participants performed a size-matching task on illusory stimuli immediately after TMS.
  • Control stimulation applied over the vertex.

Main Results:

  • Right parietal TMS at beta frequency significantly increased the magnitude of both Ebbinghaus and Ponzo illusions.
  • Left parietal stimulation at beta frequency did not affect illusion magnitudes.
  • No effect was observed with right parietal TMS at theta frequency.

Conclusions:

  • Beta oscillations in the right parietal cortex causally contribute to visual size illusion processing.
  • These findings underscore the functional importance of beta oscillations for cognitive performance in visual perception.