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A Method to Study Adaptation to Left-Right Reversed Audition
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Compression of auditory space during forward self-motion.

Wataru Teramoto1, Shuichi Sakamoto, Fumimasa Furune

  • 1Research Institute of Electrical Communication, Tohoku University, Sendai, Japan. teraw@ais.riec.tohoku.ac.jp

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Linear acceleration distorts auditory space representation during forward self-motion. Sounds are perceived as biased towards the direction of movement, with greater acceleration causing larger spatial shifts. This impacts how we interpret sound environments while moving.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Vestibular System

Background:

  • Auditory spatial perception is challenged by self-motion, yet humans maintain a stable auditory environment.
  • The brain integrates auditory information with movement data to reinterpret spatial inputs.
  • The precise mechanisms by which movement modulates auditory perception remain largely unknown.

Purpose of the Study:

  • To investigate the impact of linear acceleration on auditory space representation.
  • To understand how self-motion affects the perceived location of sounds.

Main Methods:

  • Participants underwent passive linear acceleration in a robotic wheelchair.
  • Sound bursts were presented from loudspeakers during self-motion.
  • Listeners indicated perceived sound direction or pointed to perceived sound locations.

Main Results:

  • Forward self-motion caused sounds to be perceived as shifted ahead of their actual location (ahead of the null point).
  • The magnitude of this auditory spatial displacement increased with acceleration.
  • Sounds in the direction of travel were perceived as biased towards the null point during forward motion.

Conclusions:

  • Forward self-motion induces a distortion in auditory space representation.
  • This distortion may result from anticipatory shifts in auditory receptive fields.
  • Vestibular system afferent signals likely play a role in this adaptive mechanism.