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Hearing colors: an example of brain plasticity.

Arantxa Alfaro1, Ángela Bernabeu2, Carlos Agulló2

  • 1CIBER-BBN Madrid, Spain ; Hospital Vega Baja Orihuela, Spain.

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Summary

Sensory substitution devices (SSDs) like the Eyeborg may induce brain plasticity. Long-term use of this visual-to-auditory device shows adaptive changes in the brain's visual and auditory cortices.

Keywords:
blindnessdiffusion tensor imaging (DTI)functional magnetic resonance imaging (fMRI)magnetic resonance spectroscopyneuroplasticitysensory substitution device (SSD)visual cortex

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Area of Science:

  • Neuroscience
  • Sensory Neuroscience
  • Neuroplasticity

Background:

  • Sensory substitution devices (SSDs) offer novel methods for restoring lost sensory function and augmenting neural capacities.
  • The Eyeborg is a visual-to-auditory SSD enabling color perception through sound.

Purpose of the Study:

  • To investigate potential brain plasticity in a color-blind subject using the Eyeborg SSD for 8 years.
  • To explore adaptive and compensatory changes in the brain associated with long-term SSD use.

Main Methods:

  • Utilized a combination of neuroimaging techniques: Functional Magnetic Resonance Imaging (fMRI), Diffusion Tensor Imaging (DTI), and proton Magnetic Resonance Spectroscopy ((1)H-MRS).
  • Compared brain changes in the Eyeborg user with a control population.

Main Results:

  • Observed significant adaptive and compensatory changes in the brain after 8 years of continuous Eyeborg use.
  • Identified alterations in functional neural patterns, structural connectivity, and cortical topography in the visual and auditory cortices.
  • Findings suggest potential cross-modal representations and brain adaptation to sensory loss.

Conclusions:

  • Long-term Eyeborg use may induce significant neuroplastic changes, particularly in sensory cortices.
  • These findings contribute to understanding brain adaptation to pathologies and the efficacy of SSDs.
  • Implications for rehabilitative training, device development, and programs for individuals with disabilities.