Computer simulation of intestinal slow-wave frequency gradient

Diamant, NE; Rose, PK; Davison, EJ

doi:10.1152/ajplegacy.1970.219.6.1684

Cited by 68 publications

(18 citation statements)

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“…see [3], [4] Here figures 5.1, 5.2, and 5.3 show the type of behaviour, which has been observed. In this case, it has been pointed out, e.g.…”

Section: Intestinal Slow-wavesupporting

confidence: 59%

“…In [3], it was shown that a series of Van Der Pol relaxation oscillators of successively decreasing frequencies, with "small" coupling terms interconnecting the oscillators, as illustrated in figure 5.5, could produce the experimentally observed plateau effect. then in steady-state, the resultant frequencies of the corresponding oscillators are given by figure 5.6.…”

Section: Fig 54 Van Der Pol Interconnected Oscillatorsmentioning

confidence: 99%

“…Large systems consisting of near-identical objects can often be found in nature. For example, in the 1960's the intestine of a mammal was considered as a fixed interconnection structure multi-agent system consisting of a cascade of oscillators [3], [4]. In the early 1970's, the modeling and simulation of multi-neuron networks was considered as a cooperative multi-agent system with respect to the modeling of respiratory rhythm and the lateral inhibition of the eye [5].…”

Section: Introductionmentioning

confidence: 99%

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Cooperative Control of Large Systems

Khatir

Davison

2004

Cooperative Control

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Abstract"Cooperative control" is a term which is used to capture those problem areas in which some type of repetition of identical or non-identical subsystems, which are interconnected together, occurs. Such systems are often found in nature, i.e. in the motion of clusters of birds, fish, insects, etc. moving together, in the cell structure of mammals and life-forms, and also in the man-made systems such as in transportation systems. In such systems, a decentralized control configuration is often applied to control the overall system, so that some common objective is achieved. It is perhaps too early to be able to list the fundamental problems arising in this problem area; there is however one important application area in which an understanding of the behaviour of the near-identical objects is desirable, and that is with respect to disease processes associated with the abnormal behaviour of certain organs of the human body.This paper gives a review of such typical example systems for the case of: • "fish-like" objects interacting in water.• vehicles which have the front wheel drive / steering interacting in a string formation.• analyzing the behaviour of intestinal slow-wave patterns which occur in the human body.

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“…see [3], [4] Here figures 5.1, 5.2, and 5.3 show the type of behaviour, which has been observed. In this case, it has been pointed out, e.g.…”

Section: Intestinal Slow-wavesupporting

confidence: 59%

Section: Fig 54 Van Der Pol Interconnected Oscillatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cooperative Control of Large Systems

Khatir

Davison

2004

Cooperative Control

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“…Other authors have developed model simulations for the electrogastrogram and for gastric and intestinal electrical activity (DIAMANT et al, 1970;MIRIZZI, 1985MIRIZZI, , 1986KOTHAPALLI, 1993;FAMILONI et al, 1995;MINTCHEV and BOWES, 1995). Our purpose in this work was to compare the electric potentials and the magnetic fields that result from intestinal electrical activity.…”

Section: Discussionmentioning

confidence: 99%

Volume conductor effects on the spatial resolution of magnetic fields and electric potentials from gastrointestinal electrical activity

Bradshaw

Richards

Wikswo

2001

Med. Biol. Eng. Comput.

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An analysis of the relative capabilities of methods for magnetic and electric detection of gastrointestinal electrical activity is presented. The model employed is the first volume conductor model for magnetic fields from GEA to appear in the literature. A mathematical model is introduced for the electric potential and magnetic field from intestinal electrical activity in terms of the spatial filters that relate the bioelectric sources with the external magnetic fields and potentials. The forward spatial filters are low-pass functions of spatial frequency, so more superficial external fields and potentials contain less spatial information than fields and potentials near the source. Inverse spatial filters, which are reciprocals of the forward filters, are high-pass functions and must be regularised by windowing. Because of the conductivity discontinuities introduced by low-conductivity fat layers in the abdomen, the electric potentials recorded outside these layers required more regularisation than the magnetic fields, and thus, the spatial resolution of the magnetic fields from intestinal electrical activity is higher than the spatial resolution of the external potentials. In this study, two smooth muscle sources separated by 5cm were adequately resolved magnetically, but not resolved electrically. Thus, sources are more accurately localized and imaged using magnetic measurements than using measurements of electric potential.

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“…Different models simulating the slow-wave electrical activity by a chain of relaxation oscillators have been proposed by N elsen and Becker [13], D iamant et al [8] and Sarna et al [18], According to Kobayashi et al [11], the forward coupling between oscillators was first considered to be dominant.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Transections on the Basic Electrical Rhythm in the Canine Jejunum

Mendel¹,

Pousse²,

Dauchel³

et al. 1976

Eur Surg Res

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The basic electrical rhythm (BER) was studied in situ in the jejunum in 14 anaesthetized mongrel dogs by the mean of six monopolar electrodes. The BER frequency was measured in the intact intestine and after proximal and distal transections of the gut 5 cm apart from the electrodes. No significant differences were found between the BER frequencies recorded by each electrode, demonstrating the existence of a frequency plateau which remained after each transection. In the intact intestine the frequency in the plateau was 13.2+0.3 cpm². After the proximal transection, this frequency dropped to 12.0+0.4 cpm (p < 0.05) and, after the distal transection, it dropped to 10.9+0.4 cpm (p < 0.05). This last frequency change shows the influence of the distal intestine on the electrical behaviour of the jejunum.

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Computer simulation of intestinal slow-wave frequency gradient

Cited by 68 publications

References 0 publications

Cooperative Control of Large Systems

Cooperative Control of Large Systems

Volume conductor effects on the spatial resolution of magnetic fields and electric potentials from gastrointestinal electrical activity

The Effects of Transections on the Basic Electrical Rhythm in the Canine Jejunum

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