Robustness of Temporal signal Processing in Feedback SOM --Part-III An Analysis of a Working Mechanism in State Space--

Abstract

An Elman-type feedback SOM (EFSOM) is a revised version for dealing with time-variant information. In the preceding studies, the EFSOM is applied to an on-line character recognition task, and it shows good performance on adaptability for both spatial displacement and temporal elasticity. In spite of such success through increasing the number of winner neurons, its working mechanism has not been clear yet. Then, in order to solve this problem, some further analyses are tried from the viewpoint of behavior in the state space. As a result, it is found that deviation of spatially-displaced patterns from the normal one is small enough.