Computational Neurobiology Lab


Michael S. Lewicki

Former Postdoctoral Fellow
Computational Neurobiology Lab
The Salk Institute

I have moved to the Computer Science Department at Carnegie Mellon.
I am currently in the Center for the Neural Basis of Cognition.
My new contact information is:

    Dr. Michael Lewicki
    CMU/CNBC
    Mellon Institute, 115
    4400 Fifth Ave.
    Pittsburgh, PA  15213

    Phone: 412-268-3921
    Fax:   412-268-5060
    Email: lewicki@cnbc.cmu.edu
    WWW:   www.cnbc.cmu.edu/people/lewicki.html

Last updated  Feb 18, 1999. 

Research Papers

Representation and Learning

Lewicki, M.S. and Sejnowski, T.J. (1998)  ``Coding time-varying signals using sparse, shift-invariant representations.'' to appear in Advances in Neural Information Processing Systems 11. abstract, compressed postscript .

Lewicki, M.S. and Olshausen, B.A. (1998) ``A probabilistic framework for the adaptation and comparison of image codes.'' J. Opt. Soc. Am. A: Optics, Image Science, and Vision (submitted). abstract, compressed postscript .

 Lewicki, M.S. and Sejnowski, T.J. (1998) ``Learning overcomplete representations.'' to appear in Neural Comp. abstract, compressed postscript .

 Lewicki, M.S. and Sejnowski, T.J. (1996) ``Bayesian unsupervised learning of higher order structure.'' Advances in Neural Information Processing Systems 9. abstract, compressed postscript .
 

Independent Component Analysis

Lee, T.-W., Lewicki, M.S., and Sejnowski, T.J. (1998) ``ICA Mixture Models for Unsupervised Classification of Non-Gaussian Classes and Automatic Context Switching in Blind Source Separation.'' submitted to PAMI.  preprint

Lee, T.-W., Lewicki, M.S., and Sejnowski, T.J. (1998) ``ICA Mixture Models for Unsupervised Classification and Automatic Context Switching.'' International Workshop on Independent Component Analysis (ICA'99).

Lee, T.-W., Lewicki, M.S., and Sejnowski, T.J. (1998) ``Unsupervised Classification with Non-Gaussian Mixture Models using ICA.''  to appear in Advances in Neural Information Processing Systems 11.

Lee, T.-W., Lewicki, M.S., Girolami, M., and Sejnowski, T.J. (1998) ``Blind source separation of more sources than mixtures using overcomplete representations.'' to appear in IEEE Sig. Proc. Lett. preprint
 

Songbird physiology

Lewicki, M.S. and Arthur, B.J. (1996) ``Hierarchical organization of auditory context sensitivity.'' J. Neurosci. 16(21):6987-6998. abstract, compressed postscript.  online article and pdf file from J. Neuroscience.

Lewicki, M.S (1996) ``Intracellular characterization of song-specific neurons in the zebra finch auditory forebrain.'' J. Neurosci. 16(18):5854-5863. abstract. online article and pdf file from J. Neuroscience.

 Lewicki, M.S. and Konishi, M. (1995) ``Mechanisms underlying the sensitivity of songbird forebrain neurons to temporal order.'' Proc. Natl. Acad. Sci. USA 92:5582-5586. abstract.

Vu, E.T. and Lewicki, M.S. (1994) ``Intrinsic interactions between zebra finch HVc neurons involve NMDA-receptor mediated activation.'' Soc. Neurosci. Abstr. 20:166. abstract.
 

Spike sorting

Lewicki, M.S. (1998) ``A review of methods for spike sorting: the detection and classification of neural action potentials.''  Network: Computation in Neural Systems.   9(4): R53-R78. available online from Network

Lewicki, M.S. (1994) ``Bayesian modeling and classification of neural signals.'' Neural Comp. 6:1005-1030. abstract, compressed postscript , associated reference.

 Software for Bayesian spike sorting is available at the Konishi lab anonymous FTP server at Caltech. A working copy of source and binaries that run under Linux is available here. This was packaged by Jamier Mazier who also coded the much of the graphical interface.

README
screen shot
overlaps
Matlab interface functions for AutoClass  are available for testing: actools.tar.gz.