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Unilateral vs Bilateral CI

Unilateral vs Bilateral CI. plasticity feature extraction stereoscopy/binaural hearing. Auditory Cortex in Silence. Reduced activity. Activity no longer reduced. Lee, et al., Nature, 2001. Studying Binaural Perception. Studying Binaural Perception. Studying Binaural Perception.

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Unilateral vs Bilateral CI

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  1. Unilateral vs Bilateral CI • plasticity • feature extraction • stereoscopy/binaural hearing

  2. Auditory Cortex in Silence Reduced activity Activity no longer reduced Lee, et al., Nature, 2001

  3. Studying Binaural Perception

  4. Studying Binaural Perception

  5. Studying Binaural Perception Lateralization Index = (R-L)/(R+L) (IEEE Trans. Biomed Engin, 56(12) Dec ’09)

  6. Cortical Asymmetry Left Auditory Cortex Right Auditory Cortex Lateralization Index = (R-L)/(R+L) Unilateral Short delay No delay Normal Hearing

  7. Cortical Asymmetry Left Auditory Cortex Right Auditory Cortex Lateralization Index = (R-L)/(R+L) Unilateral Long delay Short delay No delay Normal Hearing

  8. Effect of Unilateral Stimulation

  9. Abnormal cortical organization is promoted by unilateral cochlear implant use Long Delay (> 2 yrs) Short Delay (< 1 yr) Simultaneous (0 yrs) R L 0 2 0 2 0 2 1 1 1 Time (Yrs)

  10. Inter-Aural/Implant Level Differences

  11. Inter-Aural/Implant Level Differences

  12. Inter-Aural/Implant Timing Differences

  13. Inter-Aural/Implant Timing Differences

  14. Summary • sequential bilateral cochlear implantation • allows asymmetric auditory development • compromises binaural processing in the auditory cortex

  15. Summary • simultaneous bilateral cochlear implantation • promotes symmetric auditory brainstem development • protects the auditory cortex from reorganized lateralization

  16. Current Opinion • there are multiple sensitive periods in auditory development • duration of both bilateral and unilateral auditory deprivation should be limited in children

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