Enriched acoustic environment after noise trauma reduces hearing loss and prevents cortical map reorganization.

Summary

Cats exposed to traumatizing noise and then housed in a quiet environment developed the expected hearing loss and cortical tonotopic map reorganization. Cats housed instead in an enriched acoustic environment (matched to the expected hearing-loss frequency range, ~40dB above threshold) for the following weeks showed much smaller hearing loss and no demonstrable map reorganization, showing that post-injury sound exposure, not just the injury itself, shapes whether the map reorganizes.

Key findings

• Same noise trauma, different post-trauma sound environment led to very different outcomes.
• Enriched acoustic environment (matched to the hearing-loss frequency range) restricted the hearing loss.
• Cortical map reorganization could no longer be demonstrated in the enriched-environment animals.