Angebote zu "Physiological" (30 Treffer)

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Digital Enhancement of EEG/MEG Signals
48,80 € *
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Electroencephalography (EEG) and Magnetoencephalography (MEG) recordings are commonly used for analyzing the brain. However, in most cases, the recordings not only contain brain waves, but also artifacts of physiological (ocular, muscle, ECG artifacts) or technical (electrode popping, power-line) origins, and noise from different sources. The main aim of the work described in this thesis is the noise reduction and artifact suppression from EEG and MEG signals.Different techniques for artifact suppression have been used: A Low-Pass Filter (LPF), an instantaneous Independent Component Analysis (ICA) algorithm, a combination of ICA and LPF, a combination of ICA and State-Space Modeling (SSM), a combination of ICA and Wiener filters, and a hybrid filter (i.e., a filter that works in the time- and frequency-domains). These techniques have been tested only offline in the present work.Additionally, two artifact suppression methods that could work either offline or in real-time have been tested in real-time. The first one is a recent approach used for signal enhancement, called Empirical Mode Decomposition (EMD). This method is employed in this work for denoising, for detrending, and for suppressing the muscle artifacts from EEG signals. The second method is an algorithm here called Classification-based Signal Enhancement (CBSE). It was also used to suppress muscle artifacts in EEG signals, in real-time, using Wiener filters for signal enhancement.In order to use any artifact suppression technique, the artifacts to be removed have to be previously identified. If the artifact suppression is done offline, the detection can be carried out by visual inspection of the data by an expert, or in an automatic way. On the other hand, if the suppression of artifacts has to be done in real-time, the artifacts have to be detected automatically. A detection technique is proposed in the present work. First, different features are extracted from the independent components, and then a threshold-based classification is performed to determine which components are contaminated, what kind of artifacts they contain, and how the suppression of the artifacts is realized. This method was tested in an offline manner in this thesis.The effectiveness of the proposed artifact suppression techniques was demonstrated by application to either “semi-simulated” EEG signals artificially contaminated with artifacts, or to real EEG/MEG data from a healthy subject or a patient suffering from epilepsy (inherently contaminated with different kinds of artifacts). It is shown by visual inspection and in a quantitative manner that, after applying the different techniques, the EEG/MEG signals are enhanced.To reduce the noise, an equalizer and a Wiener filter have been used. The signals employed for this purpose correspond to those from the newly developed magnetoelectric (ME) sensors at Kiel University.

Anbieter: Dodax
Stand: 30.10.2020
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Biology of the Integument
171,19 € *
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The integument plays an important role in the survival of meta zoans by separating and protecting them from a hostile environ ment. Its function ranges from protection against injury and in fection, partlcipation in the regulation of body temperature and water balance, to respiratory activity, monitoring of the environ ment and production of signals related to behaviour. All these result from specific structural, biochemical and physiological properties of intra-and extracellular components of the integu ment. Thus its characterization can be best accomplished by a multidisciplinary approach with authors specialized in different fields of science. This multi-author book, in two volumes, provides an up-to date survey of the literature. The first volume deals with the integument of invertebrates, the second with that of vertebrates, both organized primarily on a phylum basis. As the level of knowledge on the integument of phyla differs considerably, the information provided is correspondingly either limited or con densed. For some of the smaller groups of invertebrates little information is available, as often only a few electron micrographs are to be found in the literature, on the other hand, from the large body of knowledge existing for vertebrates, particularly for mammals, no complete overview can be provided, but publica tions giving access to further information have been reviewed critically.

Anbieter: Dodax
Stand: 30.10.2020
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Stroke Genomics
160,49 € *
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With sequencing of the human genome now complete, deciphering the role of gene function in human neurological pathophysiology is a promise that has yet to be realized. More than most diseases, stroke has been keenly studied from a genomic perspective. Studies are numerous and incorporate data on stroke inheritance, chromosomal loci of risk, preclinical models of stroke, and differential gene expression of brain injury, repair, and recovery. The problem is no longer a lack of information but one of interpretation and prioritization of what we do know. The aims of Stroke Genomics: Methods and Reviews are twofold. First, it aims to provide the reader with cutting-edge reviews of clinical and preclinical genomics, written by leading experts in the field. In particular, the authors of certain chapters relate gene expression changes to physiological end points, such as functional imaging paradigms. Thus, a more holistic approach to gene expression is described, one in which molecular biology goes hand in hand with stroke pathophysiology. Second, detailed methods for study of the molecular biology of stroke are (TM) also included. Following the format of the Methods in Molecular Medicine series, these chapters will enable the reader to employ each technique without recourse to other methods texts. In its entirety, this book should provide the reader with the knowledge needed to design, execute, and interpret preclinical and clinical studies of stroke genomics.

Anbieter: Dodax
Stand: 30.10.2020
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Biomedical Signals and Sensors II
106,99 € *
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The book set develops a bridge between physiologic mechanisms and diagnostic human engineering. While the first volume is focused on the interface between physiologic mechanisms and the resultant biosignals, this second volume is devoted to the interface between biosignals and biomedical sensors. That is, in the first volume, the physiologic mechanisms determining biosignals are described from the basic cellular level up to their advanced mutual coordination level. This second volume, considers the genesis of acoustic and optic biosignals and the associated sensing technology from a strategic point of view. As a novelty, this book discusses heterogeneous biosignals within a common frame. This frame comprises both the biosignal formation path from the biosignal source at the physiological level to biosignal propagation in the body, and the biosignal sensing path from the biosignal transmission in the sensor applied on the body up to its conversion to a, usually electric, signal.Some biosignals arise in the course of the body's vital functions while others map these functions that convey physiological data to an observer. It is highly instructive how sound and light beams interact with biological tissues, yielding acoustic and optic biosignals, respectively. Discussed phenomena teach a lot about the physics of sound and physics of light (as engineering sciences), and, on the other hand, biology and physiology (as live sciences). The highly interdisciplinary nature of biosignals and biomedical sensors is obviously a challenge. However, it is a rewarding challenge after it has been coped with in a strategic way, as offered here. The book is intended to have the presence to answer intriguing "Aha!" questions.

Anbieter: Dodax
Stand: 30.10.2020
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Physiological Aspects of Legged Terrestrial Loc...
133,19 € *
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This book offers a succinct but comprehensive description of the mechanics of muscle contraction and legged terrestrial locomotion. It describes on the one hand how the fundamental properties of muscle tissue affect the mechanics of locomotion, and on the other, how the mechanics of locomotion modify the mechanism of muscle operation under different conditions. Further, the book reports on the design and results of experiments conducted with two goals. The first was to describe the physiological function of muscle tissue (which may be considered as the "motor") contracting at a constant length, during shortening, during lengthening, and under a condition that occurs most frequently in the back-and-forth movement of the limbs during locomotion, namely the stretch-shortening cycle of the active muscle. The second objective was to analyze the interaction between the motor and the "machine" (the skeletal lever system) during walking and running in different scenarios with respect to speed, step frequency, body mass, gravity, age, and pathological gait. The book will be of considerable interest to physiology, biology and physics students, and provides researchers with stimuli for further experimental and analytical work.

Anbieter: Dodax
Stand: 30.10.2020
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Biomedical Signals and Sensors II
98,64 € *
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The book set develops a bridge between physiologic mechanisms and diagnostic human engineering. While the first volume is focused on the interface between physiologic mechanisms and the resultant biosignals, this second volume is devoted to the interface between biosignals and biomedical sensors. That is, in the first volume, the physiologic mechanisms determining biosignals are described from the basic cellular level up to their advanced mutual coordination level. This second volume, considers the genesis of acoustic and optic biosignals and the associated sensing technology from a strategic point of view. As a novelty, this book discusses heterogeneous biosignals within a common frame. This frame comprises both the biosignal formation path from the biosignal source at the physiological level to biosignal propagation in the body, and the biosignal sensing path from the biosignal transmission in the sensor applied on the body up to its conversion to a, usually electric, signal.Some biosignals arise in the course of the body's vital functions while others map these functions that convey physiological data to an observer. It is highly instructive how sound and light beams interact with biological tissues, yielding acoustic and optic biosignals, respectively. Discussed phenomena teach a lot about the physics of sound and physics of light (as engineering sciences), and, on the other hand, biology and physiology (as live sciences). The highly interdisciplinary nature of biosignals and biomedical sensors is obviously a challenge. However, it is a rewarding challenge after it has been coped with in a strategic way, as offered here. The book is intended to have the presence to answer intriguing "Aha!" questions.

Anbieter: Dodax
Stand: 30.10.2020
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PHOTON PROPAGATION IN TISSUE AND IN BIOLOGICAL ...
79,00 € *
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The book in your hand helps you gain the insight that photon propagation in tissue and biological fluids is at least as complicated as in galaxies and stars. Two applications (1) optical vessel imaging and (2) monitoring solutes removed in haemodialysis utilising near infrared (NIR) and ultraviolet (UV) radiation, respectively, are described in more detail. The first technique offers an opportunity to combine optical vessel imaging and monitoring of physiological parameters. The second method aims to monitor solutes in a spent dialysate in order to detect deviations in dialysis efficiency and estimate the delivered dialysis dose for ensuring treatment adequacy and quality. The last method is nowdays known as the optical dialysate monitor designed to benefit the welfare of the haemodialysis patients in the world Hopefully, those with very little familiarity of the presented topics, as well as professionals, will be encouraged to explore further the amazing world around us, waiting to be discovered.

Anbieter: Dodax
Stand: 30.10.2020
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Elements Of Physiological Psychology - A Treati...
74,90 CHF *
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ELEMENTS PHYSIOLOGICAL PSYCHOLOGY BY GEORGE T, LADD. COPYRIGHT, 1887, BT CHARLES SCRIBNITO SONS PREFACE. THEEE can be no doubt that an important movement in psychology has arisen in recent times through the effort to approach the phenomena of mind from the experimental and physiological point of view. Different students of psychological science will estimate differently both the net result already reached by this effort and the promise of further additions to the sum of our knowledge from continued investigation of the same kind. Some writers have certainly indulged in extravagant claims as to the past triumphs of so called Physiological Psychology, and in equally extravagant expectations as to its future discoveries. On the other hand, a larger number, perhaps, have been inclined either to fear or to depreciate every attempt to mingle the methods, laws, and speculations of the physical sciences with the study of the human soul. These latter apparently anticipate that some discovery in the localization of cerebral function, or in psychometry, may jeopard the birthright of man as a spiritual and rational being. Or possibly they wish to regard the soul as separated, by nature and with respect to its modes of action, from the material body in such a way as to render it impossible to understand more of the one by learning more about the other. As a result of some years of study of the general subject, I express with considerable confidence the opinion that there is no ground for extravagant claims or expectations, and still less ground for any fear of consequences. In all cases of new and somewhat rankly growing scientific enterprises, it is much the better way to waive the discussion of actual or possible achievements, as well as of welcomed or dreaded revelations of new truth, and proceed at once to the business on hand. It is proposed in this book to follow this better way. It will be the task of the book itself to set forth the assured or alleged results of Physiological Psychology and this will be done at every step with such degree of assurance as belongs to the evidence hitherto attainable upon the particular subject discussed With declamation, either in attack or defence of the old psychology of the introspective method, etc., one may dispense without serious loss. The study of the phenomena of consciousness by tho method here proposed necessarily requires some acquaintance with a consider able circuit of sciences which are not usually all alike closely allied. The number of scholars who can form opinions with equal freedom and confidence in all of these sciences is very small. Moreover, since all psycho-physical laws are supposed as the very term indicates to govern the correlations of phenomena with phenomena of the nervous system, a peculiar mystery belong to much of the domain withiri which psycho-physical science i compelled to move. These facts may fitly, on tho one hand, excite caution in the writer and, on the other hand, exciiso him for many inevitable failures to set forth with perfect definition and confidence the conclusions he has to propose. Much will bo said thai must be accepted as provisional, as only probably true. Much room must also be made for conjecture and speculation. What IB most important, however, is that conjecture should not boptit forth as ascertained fact, or speculation as unquestioned law. It would have been a great assistance to mo if I had had more predecessors in the path which I am to take. But with tho exception of Wundts masterly work Grundzttye der phyxiohxjiwhtn Psychologies second edition in 1880, no ouo book han attempted to cover, even in a summary way, the entire ground...

Anbieter: Orell Fuessli CH
Stand: 30.10.2020
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The Handbook of Multimodal-Multisensor Interfac...
285,00 CHF *
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The Handbook of Multimodal-Multisensor Interfaces provides the first authoritative resource on what has become the dominant paradigm for new computer interfaces: user input involving new media (speech, multi-touch, hand and body gestures, facial expressions, writing) embedded in multimodal-multisensor interfaces that often include biosignals. This edited collection is written by international experts and pioneers in the field. It provides a textbook, reference, and technology roadmap for professionals working in this and related areas. This second volume of the handbook begins with multimodal signal processing, architectures, and machine learning. It includes recent deep learning approaches for processing multisensorial and multimodal user data and interaction, as well as context-sensitivity. A further highlight is processing of information about users' states and traits, an exciting emerging capability in next-generation user interfaces. These chapters discuss real-time multimodal analysis of emotion and social signals from various modalities, and perception of affective expression by users. Further chapters discuss multimodal processing of cognitive state using behavioral and physiological signals to detect cognitive load, domain expertise, deception, and depression. This collection of chapters provides walk-through examples of system design and processing, information on tools and practical resources for developing and evaluating new systems, and terminology and tutorial support for mastering this rapidly expanding field. In the final section of this volume, experts exchange views on the timely and controversial challenge topic of multimodal deep learning. The discussion focuses on how multimodal-multisensor interfaces are most likely to advance human performance during the next decade.

Anbieter: Orell Fuessli CH
Stand: 30.10.2020
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