Deactivating electrodes can shift frequency-to-electrode mapping and worsen perception

Evidence

Some researchers have not observed benefit from electrode deactivation and have even demonstrated potentially deleterious effects for Cochlear device users. Henshall and McKay ( 2001 ) used a multidimensional scaling technique to identify and deactivate electrodes having non-tonotopic percepts. They did not find an improvement in speech perception when channels were switched off and hypothesized that this could be due to the shift in frequency-to-electrode allocation produced by clinical software when electrodes are deactivated; particularly in the apical region. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2059

Categorization

Category: Causal Relationships

• XREF: Connects to the tradeoff between channel selectivity and place-pitch allocation discussed in previous chapters on cochlear implant signal-coded processing.

Related

• Electrode deactivation worsens spectral resolution despite unchanged stimulation rate (similarity 0.95)
• Deactivating an electrode shifts frequency-to-electrode allocation and can negate expected benefits. (similarity 0.94)
• Deactivating multiple cochlear implant electrodes can worsen rather than improve hearing (similarity 0.90)
• Deactivating multiple electrodes can worsen rather than improve information precision. (similarity 0.89)
• Deactivating multiple implant electrodes can worsen frequency information transmission (similarity 0.89)
• Deactivating indiscriminable implant electrodes fails to improve and even worsens perception (similarity 0.88)
• Deactivating non-distinct cochlear implant electrodes fails to improve speech perception (similarity 0.88)
• Deactivating cochlear implant electrodes harms spectral ripple resolution but spares speech perception (similarity 0.87)
• Electrode deactivation outcomes depend on stimulation rate and filter allocation differences (similarity 0.87)
• Deactivating pitch-indiscriminable cochlear implant electrodes yields no speech benefit (similarity 0.87)
• Deactivating discriminable electrodes controls whether benefit comes from channel count or pitch quality (similarity 0.87)
• Only half of cochlear implant users benefit from electrode deactivation, and many worsen. (similarity 0.87)
• Cochlear implant electrode deactivation produces inconclusive and strategy-dependent results (similarity 0.87)
• Cochlear implant re-mapping deactivates poorly placed electrodes to improve spectral resolution. (similarity 0.87)
• Electrode deactivation reallocates frequencies and can harm rather than help (similarity 0.86)

Broader Connections

• Deactivating CI electrodes worsens spectral resolution rather than improving speech perception #corroborates (0.92)
• Deactivating multiple cochlear implant electrodes can worsen spectral precision by broadening analysis bands #expands (0.85)