Depolarization shift in the resting membrane potential of inferior colliculus neurons explains their hyperactivity induced by an acoustic trauma.

Summary

After acoustic trauma, neurons in the inferior colliculus (IC) become hyperactive, a hallmark of the central hyperactivity linked to tinnitus. This study identifies a specific biophysical mechanism: a depolarizing shift in the resting membrane potential of IC neurons, which brings them closer to their firing threshold and explains their post-trauma hyperactivity.

Key findings

• IC neuron hyperactivity after acoustic trauma is explained by a shift in resting membrane potential toward a more depolarized (excitable) state.
• Provides a specific, testable cellular mechanism for central gain/hyperactivity increases at the midbrain level.