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A New Illusion at Your Elbow.

Peter Brugger1, Rebekka Meier2

  • 1Neuropsychology Unit, Department of Neurology, University Hospital Zurich, Frauenklinikstrasse 26, 8091 Zurich, Switzerland peter.brugger@usz.ch.

Perception
|November 13, 2015
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Summary

The elbow crook illusion, where perceived touch moves faster than actual touch, was quantified in 90 participants. This tactile illusion is stronger in the non-dominant arm and less pronounced in women due to superior cutaneous sensitivity.

Keywords:
children's gamecutaneous illusionneurophysiology

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Area of Science:

  • Neuroscience
  • Human Sensation and Perception

Background:

  • The elbow crook illusion is a tactile phenomenon where perceived touch appears to move faster than actual tactile stimuli.
  • This illusion, often experienced as a game, involves applying tactile motion to the volar forearm.

Purpose of the Study:

  • To quantify the elbow crook illusion in a large participant group.
  • To explore potential top-down (Bayesian inference) and bottom-up (cortical afterdischarges) explanations for the illusion.
  • To investigate factors influencing illusion magnitude, such as arm dominance and sex.

Main Methods:

  • Ninety participants (47 women) experienced distal-proximal tactile motion on the volar forearm.
  • The illusion's magnitude was measured on both dominant and non-dominant arms.
  • Statistical analysis was used to compare illusion sizes between arms and sexes.

Main Results:

  • Participants consistently anticipated touch at the elbow crook, indicating a significant illusion.
  • The elbow crook illusion was significantly larger on the non-dominant arm compared to the dominant arm.
  • Women exhibited a smaller illusion magnitude than men, correlating with higher cutaneous sensitivity.

Conclusions:

  • The study quantifies the elbow crook illusion, demonstrating its prevalence and characteristics.
  • Both Bayesian inference models and neural afterdischarges are considered potential mechanisms.
  • Arm dominance and sex influence the illusion, with implications for understanding somatosensory processing and sex-based differences in sensitivity.