title: Odorant recognition using biological responses recorded in olfactory bulb of rats.
abstract: In this study we applied pattern recognition (PR) techniques to extract odorant information from local field potential (LFP) signals recorded in the olfactory bulb (OB) of rats subjected to different odorant stimuli. We claim that LFP signals registered on the OB, the first stage of olfactory processing, are stimulus specific in animals with normal sensory experience, and that these patterns correspond to the neural substrate likely required for perceptual discrimination. Thus, these signals can be used as input to an artificial odorant classification system with great success. In this paper we have designed and compared the performance of several configurations of artificial olfaction systems (AOS) based on the combination of four feature extraction (FE) methods (Principal Component Analysis (PCA), Fisher Transformation (FT), Sammon NonLinear Map (NLM) and Wavelet Transform (WT)), and three PR techniques (Linear Discriminant Analysis (LDA), Multilayer Perceptron (MLP) and Support Vector Machine (SVM)), when four different stimuli are presented to rats. The best results were reached when PCA extraction followed by SVM as classifier were used, obtaining a classification accuracy of over 95% for all four stimuli.
authors.affiliation: Department of Electrical Engineering, University of Chile, Av. Tupper 2007, Casilla 412-3, Santiago, Chile.
authors.forename: Marcela A
authors.initials: MA
authors.lastname: Vizcay
authors.affiliation: Department of Electrical Engineering, University of Chile, Av. Tupper 2007, Casilla 412-3, Santiago, Chile. Electronic address: mduartem@ing.uchile.cl.
authors.forename: Manuel A
authors.initials: MA
authors.lastname: Duarte-Mermoud
authors.affiliation: Program of Physiology and Biophysics, ICBM, University of Chile, Av. Independencia 234, Santiago, Chile. Electronic address: maylwin@med.uchile.cl.
authors.forename: María de la Luz
authors.initials: Mde L
authors.lastname: Aylwin
mesh_terms: D000818:Animals; D062609:Electronic Nose; D005071:Evoked Potentials / Q000502:physiology*; D009830:Olfactory Bulb / Q000502:physiology*; D055696:Olfactory Perception / Q000502:physiology*; D051381:Rats; D060388:Support Vector Machine
keywords: Feature extraction; Fisher Transformation (FT); Local field potential in olfactory bulb; Multilayer Perceptron (MLP); Odorant classification; Pattern recognition; Principal component analysis (PCA); Sammon NonLinear Map (NLM); Support Vector Machine (SVM); Wavelet Transform (WT)