Sound offset responses become highly informative in the auditory cortex

Area of Science:

• Neuroscience
• Auditory System Processing
• Sensory Neuroscience

Background:

• The auditory system exhibits widespread offset responses following sound termination.
• The precise origin and processing of these offset responses across auditory stages remain unclear.

Purpose of the Study:

• To investigate the presence and characteristics of auditory offset responses in the central auditory system.
• To determine if offset responses are computed centrally or recomputed at each processing stage.
• To compare the information content of offset responses between cortical and subcortical auditory areas.

Main Methods:

• Analysis of large-scale neural response datasets from the cochlear nucleus, inferior colliculus, medial geniculate nucleus, and auditory cortex of awake mice.
• Utilized population activity decoders to assess neural encoding accuracy of sound offset information.

Main Results:

• Significant offset responses were observed in all analyzed brain regions, often co-occurring with onset and sustained responses.
• Neural representations of sound offset showed a three-fold increase in encoding accuracy in the auditory cortex compared to subcortical areas.
• Cortical offset responses encode more precise short-term memory of elapsed sounds than subcortical responses.

Conclusions:

• Auditory offset responses are a ubiquitous feature across the central auditory system.
• The auditory cortex exhibits enhanced computational capabilities for processing sound offset information, likely involving specific neural computations.
• Cortical offset responses contribute richer information about elapsed sounds, suggesting a role in short-term auditory memory.