Nonlinear time-domain cochlear model for transient stimulation and human otoacoustic emission

Area of Science:

• Auditory Neuroscience
• Bioacoustics
• Computational Biology

Background:

• The cochlea's mechanical behavior is complex and nonlinear.
• Otoacoustic emissions (OAEs) provide insights into cochlear function.
• Accurate models are needed to understand cochlear mechanics and OAE generation.

Purpose of the Study:

• To implement and evaluate a nonlinear time-domain model of the cochlea.
• To simulate transient stimulation and human otoacoustic emission generation.
• To investigate cochlear mechanics and OAE generator mechanisms.

Main Methods:

• Developed a nonlinear time-domain computational model of the cochlea.
• Incorporated nonlinearity simulating compressive basilar-membrane responses.
• Modeled reflection and distortion-source OAEs, and spontaneous OAEs via middle-ear reflectance.
• Calibrated the model using human psychoacoustical and otoacoustic tuning data.

Main Results:

• The model successfully simulated compressive growth of basilar-membrane impulse responses.
• It accurately accounted for reflection and distortion-source OAEs.
• Simulation of spontaneous OAEs was achieved by manipulating middle-ear reflectance.
• Model calibration confirmed its ability to match human auditory data.

Conclusions:

• The nonlinear cochlear model effectively simulates key aspects of cochlear mechanics and OAE generation.
• The model serves as a valuable tool for studying time-dependent cochlear properties.
• It can be utilized as a preprocessor for auditory perception models requiring realistic cochlear excitation patterns.