Behavioral Approaches to Study Top-Down Influences on Active Listening

Area of Science:

• Neuroscience
• Auditory Perception
• Behavioral Science

Background:

• Descending corticofugal projections are crucial for sound processing but their functions are not fully understood.
• Current research often infers function indirectly, necessitating new approaches to study the auditory corticofugal system.

Purpose of the Study:

• To establish behavioral paradigms that reveal top-down influences on auditory perception.
• To investigate how anticipation of sound timing enhances auditory performance.

Main Methods:

• Developed three behavioral paradigms in human subjects and mice to study auditory expectation and perception.
• Utilized visually cued sound onset detection, temporal regularity in noise, and self-initiated auditory targets.
• Focused on paradigms suitable for head-fixed preparations in genetically tractable animals.

Main Results:

• Observed species-specific differences in visually cued sound onset expectation.
• Demonstrated that temporal regularity improves target detection in noise.
• Showed improved frequency discrimination and perceptual sensitivity with predictable temporal intervals following self-initiated actions.

Conclusions:

• The developed behavioral framework allows for the investigation of top-down influences on auditory perception.
• These paradigms facilitate precise manipulation and monitoring of the descending auditory pathway in animal models.
• Provides a foundation for understanding how predictive mechanisms enhance auditory processing.