The effects of noise on a spike train propagating on a nerve fiber during the relative refractory period are studied by using a stochastic version of the Hodgkin-Huxley model. Fluctuations in spike speeds due to the n...
The effects of noise on a spike train propagating on a nerve fiber during the relative refractory period are studied by using a stochastic version of the Hodgkin-Huxley model. Fluctuations in spike speeds due to the noise cause negative correlation between adjacent interspike intervals, while the dispersion relation due to the refractory causes positive correlation. A kinematic description of spike propagation yields expressions for changes in the autocorrelation and power spectrum of the interspike intervals during propagation. The power spectrum of the interspike intervals of an initially regular spike train first grows in proportion to 1 - cos(omega) and then becomes a white noise spectrum. computer simulation shows that the form of the power spectrum is considerably changed on a small nerve fiber.
Effects of membrane noise (channel noise) on the conduction of action potentials at a branching point on an axon are studied on the basis of a stochastic version of the Hodgkin-Huxley cable model. computer simulation ...
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(纸本)0780307852
Effects of membrane noise (channel noise) on the conduction of action potentials at a branching point on an axon are studied on the basis of a stochastic version of the Hodgkin-Huxley cable model. computer simulation shows that the channel noise causes random differential conduction into daughter branches on an axon of small radius (≃ 0.1 µm).
Proposes an efficient architecture for selective image modeling. The authors give an example in which models of different scale are reconstructed in parallel. It is shown that this redundant representation can effecti...
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Proposes an efficient architecture for selective image modeling. The authors give an example in which models of different scale are reconstructed in parallel. It is shown that this redundant representation can effectively be pruned using the criterion of minimum description length. Models that are selected in the final description indicate the appropriate scale of observation.< >
Effects of membrane noise (channel noise) on the conduction of action potentials at a branching point on an axon are studied on the basis of a stochastic version of the Hodgkin-Huxley cable model. computer simulation ...
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Effects of membrane noise (channel noise) on the conduction of action potentials at a branching point on an axon are studied on the basis of a stochastic version of the Hodgkin-Huxley cable model. computer simulation shows that the channel noise causes random differential conduction into daughter branches on an axon of small radius (≃ 0.1 µm).
This paper presents a real time image processor for obtaining three-dimensional (3-D) distance information from image sequence caused by a moving area sensor or multiple fixed area sensors. The processor has been deve...
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Automatic font generation is critical for office automation and the publishing industry. For the design of user font, the user can input a specified font to our system which will be described later. The system describ...
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Automatic font generation is critical for office automation and the publishing industry. For the design of user font, the user can input a specified font to our system which will be described later. The system described can trace out the boundary of the input font, find out control points and their corresponding curvatures, and edit (including zooming) the font. This system is based on two points. The first is the least square error curve fitting for finding out the control points and computing their curvatures. The second point is beta-spline curve for quickly editing the shape of the input font where the tension parameter is tuned, so that the sharpness and smoothness can be well preserved when zooming. Experimental results indicate smooth performance of our system.
Effects of membrane current noise on spike propagation along a nerve fiber are studied. Additive current noise and channel noise are considered by using stochastic versions of the Hodgkin-Huxley model. The results of ...
Effects of membrane current noise on spike propagation along a nerve fiber are studied. Additive current noise and channel noise are considered by using stochastic versions of the Hodgkin-Huxley model. The results of computer simulation show that the membrane noise causes considerable variation of the propagation time of a spike (thus changes in interspike intervals) for a small unmyelinated fiber of radius 0.1 approximately 1-mu-m.
An algorithm is proposed for the detection and separation of specularity from Lambertian reflectance using multiple image frames from different viewpoints. The algorithm is based on the physical model of the multiple ...
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An algorithm is proposed for the detection and separation of specularity from Lambertian reflectance using multiple image frames from different viewpoints. The algorithm is based on the physical model of the multiple reflection mechanism in which the appearance of specularity varies depending on viewing direction while that of Lambertian reflection does not. The approach is to move camera sensors actively and to obtain as many image frames as possible. Experimental results are presented to show the efficiency of the algorithm.< >
A new method is proposed for feature extraction and representation of character and figure patterns using a vector field. The vector field is constructed from a distance transformation like the gradient vector of the ...
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A new method is proposed for feature extraction and representation of character and figure patterns using a vector field. The vector field is constructed from a distance transformation like the gradient vector of the electric field caused by a charged pattern. Features are defined by a set of the source points, sink points, and locally homogeneous domains of the vector field. It is shown that these features are effective for detecting holes (loops) and directional segments of the input pattern. The pattern and the frame can be segmented naturally and the segmentation represents the juxtapositional relation among the locally homogeneous domains of flow-out vectors from the pattern. The authors discuss the relation between the distance transformation that the vector field is based on and scale-space filtering which can be regarded as a kind of diffusion and/or blurring processing of the shape of pattern.< >
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