Efficient Sparse Coding in Early Sensory Processing: Lessons from Signal Recovery
Figure 2
Distribution of the shape parameters for the model and for the experimental data.
Receptive fields of simple cells in primary visual cortex, linearly approximated by spike triggered averaging. Data [8] are available at http://web.mac.com/darioringach/lab/Data.html. Our model filters show significant diversity in the fitted shapes similar to what has been found experimentally. While other models (e.g. [39], [40]) are also able to partially match the filters to the observed RFs, a significant difference is that our model uses highly overcomplete representations. For other differences, see the main text.