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Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học quốc tế cung cấp cho các bạn kiến thức về ngành y đề tài: A topological model of biofeedback based on catecholamine interactions | Theoretical Biology and Medical Modelling BioMed Central Research Open Access A topological model of biofeedback based on catecholamine interactions Tapas K Basak Suman Halder Madona Kumar Renu Sharma and Bijoylaxmi Midya Address Department of Electrical Engineering Jadavpur University Kolkata-700032 India Email Tapas K Basak - tkb20042001@yahoo.co.in Suman Halder - sum_hal@yahoo.co.in Madona Kumar - madona_kumar@rediffmail.com Renu Sharma - tinu_z2002@yahoo.com Bijoylaxmi Midya - jharna_midhya@yahoo.com Corresponding author Published 21 March 2005 Received 21 October 2004 Theoretical Biology and Medical Modelling 2005 2 11 doi 10.1186 1742-4682-2-1 I Accepted 21 March 2005 This article is available from http www.tbiomed.cOm content 2 1 1 1 2005 Basak et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http creativecommons.org licenses by 2.0 which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background The present paper describes a topological model of biofeedback. This model incorporates input from a sensory organ and a transduction phase mediated through catecholamine production in the feedback path. The transduction phase comprises both conservative and dissipative systems from which the appropriate output is combined in a closed loop. Results The model has been simulated in MATLAB 6.0 R12 in order to facilitate a comprehensive understanding of the complex biofeedback phenomena concomitant with the transduction phases associated with migraine and with psychosomatic diseases involving digestive disorders. Conclusion The complexity of the biological system influences the transduction phase and nature of the system response which is consequent on the activation of smooth muscles by sympathetic and parasympathetic stimulation. Background The paper describes a comprehensive model of a biofeedback system