A hierarchical sparse coding model predicts acoustic feature encoding in both auditory midbrain and cortex

by Qingtian Zhang, Xiaolin Hu, Bo Hong, Bo Zhang The auditory pathway consists of multiple stages, from the cochlear nucleus to the auditory cortex. Neurons acting at different stages have different functions and exhibit different response properties. It is unclear whether these stages share a common encoding mechanism. We trained an unsupervise d deep learning model consisting of alternating sparse coding and max pooling layers on cochleogram-filtered human speech. Evaluation of the response properties revealed that computing units in lower layers exhibited spectro-temporal receptive fields (STRFs) similar to those of inferior colliculus n eurons measured in physiological experiments, including properties such as sound onset and termination, checkerboard pattern, and spectral motion. Uni...

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