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[Ofer Hendin]

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DECOMPOSITION OF A MIXTURE OF SIGNALS IN A MODEL OF THE OLFACTORY BULB

(to be published in PNAS)
                   
                      O. HENDIN and D. HORN

                    School of Physics and Astronomy
           Raymond and Beverly Sackler Faculty of Exact Sciences
                         Tel Aviv University
                        Tel Aviv 69978 Israel

                          J. J. HOPFIELD

                  Divisions of Chemistry and Biology
                  California Institute of Technology
                      Pasadena, California 91125

 ABSTRACT

We describe models for the olfactory bulb which perform separation
and decomposition of mixed odor inputs from different sources.
The odors are unknown to the system, hence this is an analog
and extension of the engineering problem of blind separation of signals.
The separation process makes use of the different temporal fluctuations
of the input odors which occur under natural conditions.
We discuss two possibilities, one relying on a specific architecture
connecting modules with the same sensory inputs, and the other assuming
that the modules (e.g. glomeruli) have different receptive
fields in odor space. We compare the implications of these models
for the testing of mixed odors from a single source.

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Ofer.
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Ofer Hendin                      e-mail: hendin at thunder.tau.ac.il
School of Physics and Astronomy  Phone : +972 3 640 7452
Raymond and Beverly Sackler    
Faculty of Exact Sciences
Tel Aviv University
Tel Aviv 69978, Israel.
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