Chaos and order in biomedical rhythms

Savi, Marcelo A.

doi:10.1590/s1678-58782005000200008

Cited by 37 publications

(45 citation statements)

References 90 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Neither the dissertation or thesis, nor substantial extracts from it, may be printed or otherwise reproduced without the author's permission. sur de récentes études biomédicales portant sur le cerveau et fondées sur la théorie du chaos (Babloyantz, 2006;Savi, 2005).…”

Section: Mise En Garde/adviceunclassified

“…Selon des études biomédicales, le cerveau traiterait l'information selon des modes de fonctionnement qui répondent naturellement aux lois du chaos temporel (Babloyantz, 2006;Savi, 2005). S'interrogeant sur la complexification spontanée de l'environnement dans un contexte de catastrophe naturelle et technologique sur les organisations, ce mémoire a passé en revue de la théorie de la contingence structurelle (Emery et Trist, 1969), la théorie de l'écologie des populations (Hannan et Freeman, 1977) et le modèle de synthèse de Miller (1996).…”

Section: Sélectionunclassified

“…L'approche pose des concepts destinés à tirer parti de la complexité (Axelrod et Cohen, 2001 (Babloyantz, 2006;Savi, 2005) et dans la maladie de Creutzfeldt-Jacob (Babloyantz, 2006). Au contraire, lorsque le chaos est plus élevé que la normale, ce pourrait être le signe d'un état dépressif (Savi, 2005). À partir de ces observations, l'hypothèse selon laquelle le rythme des communications internes d'une organisation serait, en fonction de selon sa cohérence selon les lois du chaos temporel, associé à des pathologies organisationnelles pourrait être posée.…”

Section: Sélectionunclassified

See 3 more Smart Citations

Méta analyse du phénomène d'auto-organisation des systèmes complexes dans un contexte de catastrophe naturelle et technologique /

Morin¹

2006

View full text Add to dashboard Cite

AOÛT 2006 Mise en garde/AdviceAfin de rendre accessible au plus grand nombre le résultat des travaux de recherche menés par ses étudiants gradués et dans l'esprit des règles qui régissent le dépôt et la diffusion des mémoires et thèses produits dans cette Institution, l'Université du Québec à Chicoutimi (UQAC) est fière de rendre accessible une version complète et gratuite de cette oeuvre.Motivated by a desire to make the results of its graduate students' research accessible to all, and in accordance with the rules governing the acceptation and diffusion of dissertations and theses in this Institution, the Université du Québec à Chicoutimi (UQAC) is proud to make a complete version of this work available at no cost to the reader.L'auteur conserve néanmoins la propriété du droit d'auteur qui protège ce mémoire ou cette thèse. Ni le mémoire ou la thèse ni des extraits substantiels de ceux-ci ne peuvent être imprimés ou autrement reproduits sans son autorisation.The author retains ownership of the copyright of this dissertation or thesis. Neither the dissertation or thesis, nor substantial extracts from it, may be printed or otherwise reproduced without the author's permission.

show abstract

Section: Mise En Garde/adviceunclassified

Section: Sélectionunclassified

See 2 more Smart Citations

Méta analyse du phénomène d'auto-organisation des systèmes complexes dans un contexte de catastrophe naturelle et technologique /

Morin¹

2006

View full text Add to dashboard Cite

show abstract

“…The mathematical modeling of ecological phenomena has an increasing importance in recent years (Jorgensen, 1999;Savi, 2005Savi, , 2006). These models may describe time evolution and spatial distribution being able to explain some important characteristics of ecological systems.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamics and Chaos of the Daisyworld Employed for Global Warming Description

Viola¹

2013

Appl Ecol Env Res

View full text Add to dashboard Cite

Abstract. The mathematical modeling of ecological phenomena may describe time evolution and spatial distribution being capable to explain some important characteristics of ecological systems. Although there are many difficulties related to the system description, their modeling may define at least a system caricature, which may be useful for different goals. This contribution deals with the modeling of the global warming in a nonlinear dynamics point of view. Mathematical modeling is based on the daisyworld that is able to describe the global regulation that can emerge from the interaction between life and environment. In brief, daisyworld represents life by daisy populations while the environment is represented by temperature. Here, two daisy populations are of concern, black and white daisies, and an extra variable related to greenhouse gases is incorporated in the model allowing the analysis of the global warming. Moreover, transient analysis of temperature evolution is of concern. Climate variability is represented by a sinusoidal variation of the luminosity. Numerical simulations are investigated in order to present a qualitative description of the phenomenon. Daisyworld dynamics presents a rich behavior including chaos.

show abstract

Evaluating nonlinear variability of mental fatigue behavioral indices during long‐term attentive task

et al. 2012

View full text Add to dashboard Cite

This study investigates the behavioral indices of attention. A simple repetitive attentive task that resulted in mental fatigue was used consecutively in four trials. In the first step, reaction time and error responses were recorded to evaluate differences among trials. During the task, subjects showed different responses to stimulations. In the second part, to recognize the strategies, multiple clustering methods such as k-means and fuzzy c-means were performed in which behavioral indices and nonlinear features were used. In the last section, mental behavior was identified as a result of the chaotic properties of variations in reaction time. Therefore, the Lyapunov exponent of reaction times was evaluated. Results revealed that behavioral indices could distinguish attention from the occurrence of mental fatigue in trials. In addition, the three strategies used by subjects during the test protocol were assessed. Finally, variation of indices extracted from nonlinear analysis, that is, decrease in degree of chaotic behavior determined the transition from attention to mental fatigue.

show abstract

Chaos and order in biomedical rhythms

Cited by 37 publications

References 90 publications

Méta analyse du phénomène d'auto-organisation des systèmes complexes dans un contexte de catastrophe naturelle et technologique /

Méta analyse du phénomène d'auto-organisation des systèmes complexes dans un contexte de catastrophe naturelle et technologique /

Nonlinear Dynamics and Chaos of the Daisyworld Employed for Global Warming Description

Evaluating nonlinear variability of mental fatigue behavioral indices during long‐term attentive task

Contact Info

Product

Resources

About