Mixed-mode oscillations in a three time-scale model for the dopaminergic neuron
Martin Krupa, Nikola Popovic, Nancy Kopell, and Horacio G. Rotstein
Mixed-mode dynamics is a complex type of dynamical behavior that has been observed both numerically and experimentally in numerous prototypical systems in the natural sciences. The compartmental Wilson-Callaway model for the dopaminergic neuron is an example of a system that exhibits a wide variety ... [Chaos 18, 015106 (2008)] published Thu Mar 27, 2008.
A diagnostic process extended in time as a fuzzy model
Elisabeth Rakus-Andersson and Tadeusz Gerstenkorn
The paper refers to earlier results obtained by the authors and constitutes their essential complement and extension by introducing to a diagnostic model the assumption that the decision concerning the diagnosis is based on observations of symptoms carried out repeatedly, by stages, which may have e ... [AIP Conf. Proc. 465, 283 (2008)] published Thu Mar 27, 2008.
Space-time unity and the representation problem
Franz-Gunter Winkler
The representation problem, which plays a crucial role in the study of cognition, is discussed from a holistic perspective. Based on some distinctions a concept of duality is introduced, which can be applied to two aspects involved in the representation problem, namely meaning and computation. (C)19 ... [AIP Conf. Proc. 465, 131 (2008)] published Thu Mar 27, 2008.
Structured brain computing and its learning
Tadashi Ae, Hiroyuki Araki, and Keiichi Sakai
We have proposed a two-level architecture for brain computing, where two levels are introduced for processing of meta-symbol. At level 1 a conventional pattern recognition is performed, where neural computation is included, and its output gives the meta-symbol which is a symbol enlarged from a symbo ... [AIP Conf. Proc. 465, 111 (2008)] published Thu Mar 27, 2008.
Hyperincursive nature of the iota-operator
Arturo G. Grappone
This paper proves the hyprincursive nature of the iota-operator, i.e. of the logical operator `the … such that', by representation of standard bivalent logic as a set inclusive network. (C)1999 American Institute of Physics. ... [AIP Conf. Proc. 465, 103 (2008)] published Thu Mar 27, 2008.
Complexity VIII. Ontology of closure in complex systems: The C hypothesis and the O degrees notation
Jerry LR Chandler
Closure is a common characteristic of mathematical, natural and socio-cultural systems. Whether one is describing a graph, a molecule, a cell, a human, or a nation state, closure is implicitly understood. An objective of this paper is to continue a construction of a systematic framework for closure ... [AIP Conf. Proc. 465, 93 (2008)] published Thu Mar 27, 2008.
Outline of a philosophy of anticipation
Richard K. Khuri
In the first part of the paper, a metaphysics of anticipation is presented through the ordering of the different levels of anticipation in the natural world. The interconnections between those different levels are highlighted. In the second part, an attempt is first made to delineate the various mat ... [AIP Conf. Proc. 465, 83 (2008)] published Thu Mar 27, 2008.
Autonomy in anticipatory systems: Significance for functionality, intentionality and meaning
John D. Collier
Many anticipatory systems cannot in themselves act meaningfully or represent intentionally. This stems largely from the derivative nature of their functionality. All current artificial control systems, and many living systems such as organs and cellular parts of organisms derive any intentionality t ... [AIP Conf. Proc. 465, 75 (2008)] published Thu Mar 27, 2008.
A medical prescription for a mind
J. Simoes da Fonseca
The author who is an expert in clinical psychiatry deals with the problem of modeling human Mind the way physicians implicitly use when their profession renders necessary to intervene to help or even cure patients. If physicists, mathematicians or cognitive science specialists and engineers may prop ... [AIP Conf. Proc. 465, 65 (2008)] published Thu Mar 27, 2008.
Brain Researchers Differ on MEG's Role in Getting Ahead
Paul L. Nunez and Samuel J. Williamson
Abstract not available. [Phys. Today 49, 109 (2008)] published Fri Jan 11, 2008.
Neocortical Dynamics and Human EEG Rhythms
Paul L. Nunez and Samuel J. Williamson
Abstract not available. [Phys. Today 49, 57 (2008)] published Fri Jan 11, 2008.
Might Neuronal Spikes Permit a Binary Brain?
William Softky
Abstract not available. [Phys. Today 47, 11 (2008)] published Fri Jan 11, 2008.
Neurons, Dynamics and Computation
John J. Hopfield
The question How does it work? is the motivation of many physicists. Condensed matter physics, chemical physics and nuclear physics can all be thought of as descriptions of the relation between structure and properties. The components of a biological system have functional properties that are partic ... [Phys. Today 47, 40 (2008)] published Fri Jan 11, 2008.
Spin Glass VII: Spin Glass as Paradigm
Philip W. Anderson
Abstract not available. [Phys. Today 43, 9 (2008)] published Fri Jan 11, 2008.
Introduction to Theoretical Neurobiology: Vol. 1: Linear Cable Theory And Dendrite Structure; Vol. 2: Nonlinear and Stochastic Theories
Henry C. Tuckwell and Idan Segev
Abstract not available. [Phys. Today 43, 119 (2008)] published Fri Jan 11, 2008.
Phase Synchronization May Reveal Communication Pathways in Brain Activity
Richard Fitzgerald
Employing experiments that range from studying isolated pairs of lobster neurons to looking at electrical and magnetic signals from human test subjects, physicists are applying concepts from nonlinear systems, chaos and control theory to improve our understanding of neuronal dynamics. Exemplifying t ... [Phys. Today 52, 17 (2008)] published Fri Jan 11, 2008.
Medical Physics, Volume III: Synapse, Neuron, Brain
Arthur C. Damask, Charles E. Swenberg, John R. Cameron, and Steve Orman
Abstract not available. [Phys. Today 39, 76 (2008)] published Tue Jan 8, 2008.
Dynamical phases of the Hindmarsh-Rose neuronal model: Studies of the transition from bursting to spiking chaos
Giacomo Innocenti, Alice Morelli, Roberto Genesio, and Alessandro Torcini
The dynamical phases of the Hindmarsh-Rose neuronal model are analyzed in detail by varying the external current I. For increasing current values, the model exhibits a peculiar cascade of nonchaotic and chaotic period-adding bifurcations leading the system from the silent regime to a chaotic state d ... [Chaos 17, 043128 (2007)] published Fri Dec 28, 2007.
Comparison of blood-oxygen-leveldependent functional magnetic resonance imaging and near-infrared spectroscopy recording during functional brain activation in patients with stroke and brain tumors
Kaoru Sakatani, Yoshihiro Murata, Norio Fujiwara, Tatsuya Hoshino, Shin Nakamura et al.
Blood-oxygen-leveldependent contrast functional magnetic resonance imaging (BOLD-fMRI) has been used to perform functional imaging in brain disorders such as stroke and brain tumors. However, recent studies have revealed that BOLD-fMRI does not image activation areas correctly in such patients. To c ... [J. Biomed. Opt. 12, 062110 (2007)] published Fri Dec 28, 2007.
Control of spatially patterned synchrony with multisite delayed feedback
C. Hauptmann, O. Omel`chenko, O. V. Popovych, Y. Maistrenko, and P. A. Tass
We present an analytical study describing a method for the control of spatiotemporal patterns of synchrony in networks of coupled oscillators. Delayed feedback applied through a small number of electrodes effectively induces spatiotemporal dynamics at minimal stimulation intensities. Different arran ... [Phys. Rev. E 76, 066209 (2007)] published Thu Dec 20, 2007.
Phase response curves in the characterization of epileptiform activity
J. L. Perez Velazquez, R. F. Galan, L. Garcia Dominguez, Y. Leshchenko, S. Lo et al.
Coordinated cellular activity is a major characteristic of nervous system function. Coupled oscillator theory offers unique avenues to address cellular coordination phenomena. In this study, we focus on the characterization of the dynamics of epileptiform activity, based on some seizures that manife ... [Phys. Rev. E 76, 061912 (2007)] published Wed Dec 19, 2007.