Identification of the nociceptive forward pathway using perception thresholds

Yang, H. and Buitenweg, J.R. and Meijer, H.G.E. (2012) Identification of the nociceptive forward pathway using perception thresholds. In: 8th IFAC Symposium on Biological and Medical Systems, 29-31 August 2012, Budapest, Hungary.

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Abstract:	Quantitatively characterizing the malfunctioning of the nociceptive forward pathway may aid in improved management of pain, such as chronic pain. Psychophysical studies of this pathway have shown that the minimal stimulus amplitude resulting in a detection is related to three temporal parameters of the stimulus. To represent the neurophysiological mechanisms of the nociceptive forward pathway, we establish two models consisting of a Wiener-Hammerstein system followed by a binary response nonlinearity. The two versions differ in the static nonlinearity in the Wiener-Hammerstein system. One is a ramp function, the other is a step function. Each model has 4 parameters, two time constants and two compound gain/threshold parameters of nociceptive fibres and dorsal horn neurons. We show it is possible to estimate four parameters using 4-5 perception thresholds, with whose amplitude half of the stimuli will be perceived. We assess the effect of Gaussian measurement error on the estimation error. We conclude that the model with a step function is preferred over its competitor due to better estimation performance and model flexibility.
Item Type:	Conference or Workshop Item
Copyright:	© 2012 IFAC
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Applied Analysis and Mathematical Physics (AAMP) Biomedical Signals and Systems (BSS)
Link to this item:	http://purl.utwente.nl/publications/81523
Official URL:	http://dx.doi.org/10.3182/20120829-3-HU-2029.00103
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