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Echo

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
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Human Exploration of Enclosed Spaces through Echolocation.

Virginia L Flanagin1, Sven Schörnich2, Michael Schranner2

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The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 12, 2017
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Summary

Human echolocation, the active sensing of space using self-generated sounds, is enhanced by vocalization. Brain activity in vocal-motor and auditory areas correlates with perceived room size, demonstrating neural sensory-motor coupling.

Keywords:
echolocationfMRIsensory-motor couplingspatial processingvirtual acoustic space

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Human Echolocation

Background:

  • Human echolocation enables spatial navigation through analyzing self-generated sound echoes.
  • Previous research often focused on passive listening, limiting understanding of active sensing mechanisms.

Purpose of the Study:

  • To investigate human perception of enclosed spaces using echolocation.
  • To reveal the interplay between sensory and vocal-motor neural activity during echolocation.
  • To compare active vocalization versus passive sound listening in echolocation tasks.

Main Methods:

  • Utilized a virtual space technique with sighted subjects trained to detect room size changes.
  • Measured brain activity using functional magnetic resonance imaging (fMRI) during active vocalization and passive sound conditions.
  • Analyzed vocalizations and corresponding hemodynamic activity in vocal-motor and auditory cortices.

Main Results:

  • Subjects demonstrated superior room size estimation with active vocalization compared to passive listening.
  • Hemodynamic activity in vocal-motor cortices correlated with performance, even after isolating motor and sensory components.
  • Thalamic and auditory-midbrain activity showed correlation with perceived room size, suggesting top-down processing.
  • Neural sensory-motor coupling was evident, with brain activity varying with perceived space despite unchanged motor output.

Conclusions:

  • Human echolocation is fundamentally an active sensing process, supported by both behavior and brain activity.
  • Neural sensory-motor coupling plays a crucial role in human echolocation, complementing the acoustic feedback loop.
  • Findings highlight the importance of active vocalization in enhancing spatial perception and brain function during echolocation.