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Visual pursuit biases tactile velocity perception.

Cécile R Scotto1, Alessandro Moscatelli2,3, Thies Pfeiffer4

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Smooth pursuit eye movements influence tactile motion perception, causing static surfaces to feel like they are moving. This cross-sensory effect aligns with Bayesian models of motion processing.

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Cross-modal Integration

Background:

  • The Filehne illusion demonstrates visual motion misperception during smooth pursuit eye movements.
  • Similar illusions suggest shared mechanisms for motion processing across senses like vision and touch.
  • Prior work showed tactile motion perception is biased by hand movement.

Purpose of the Study:

  • To investigate the interplay between visual smooth pursuit eye movements and tactile motion perception.
  • To determine if eye movements can bias the perceived direction of tactile motion.
  • To explore how stimulus reliability influences this cross-sensory interaction.

Main Methods:

  • Participants performed smooth pursuit eye movements while a tactile stimulus was applied to the fingertip.
  • The perceived direction of tactile motion was recorded under varying visual and tactile conditions.
  • A Bayesian framework was used to model the influence of stimulus reliability.

Main Results:

  • Smooth pursuit eye movements biased the perceived direction of tactile motion, mirroring the Filehne illusion.
  • A static tactile surface was perceived as moving in the opposite direction of eye pursuit.
  • The magnitude of this bias was modulated by the reliability of both visual and tactile stimuli.

Conclusions:

  • Smooth pursuit eye movements can significantly alter tactile motion perception.
  • These findings support a modality- and effector-independent process for motion perception.
  • Shared neural representations likely underlie cross-modal motion processing, consistent with Bayesian integration.