Hierarchical Generative Model For Mid-Level Auditory Representations Of Natural Sounds.pdf

Wiktor_COSYNE_2015_hierarchy_final.pdf
Preview of Hierarchical Generative Model for Mid-Level Auditory Representations of Natural Sounds
🔗 Source: cbmm.mit.edu
📊 Size: 2.52 MB
📄 Pages: 2 pages
⬇️ Downloads: 21

Summary

Key Insights:

Mid-level representation: The model focuses on learning combinations of spectrotemporal features from natural sound statistics, bridging low-level acoustic patterns and high-level meaningful representations.
Sparse convolutional code: The first layer forms a sparse convolutional code of spectrograms, resembling receptive fields (RFs) of mid-brain and cortical neurons.
Time-varying magnitude encoding: The second layer encodes patterns of time-varying variance in the first layer activations, leading to more selective representations of complex acoustic patterns.
Noise invariance: The model constructs representations progressively more invariant to noise, reflecting recent experimental findings.

Results:

The model demonstrates:

Improved performance on a denoising task, implying a closer match to natural stimulus distributions.
Selectivity in auditory neuron characterizations by multidimensional RFs and sensitivity to increasingly abstract structures.
* Consistent predictions with experimental observations regarding noise invariance and progressive representation construction.

Significance:

These findings suggest that mid-level auditory representations may emerge from high-order stimulus dependencies present in the natural environment, providing a potential explanation for how the brain efficiently processes complex sounds.

Description

Researchers from MIT's Department of Brain and Cognitive Sciences explore how neurons process natural sounds, focusing on the hierarchical coding strategies that enable auditory perception by combining low-level acoustic patterns into complex structures. Their work aims to bridge the gap between visual models explaining phase invariance in V1 and understanding auditory scene representation.

Technical Information

  • File Format: PDF
  • File Size: 2.52 MB
  • Pages: 2
  • Language: EN
  • Total Downloads: 21
  • Last Updated: 6 days ago

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