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Nonlinear Control of Heartbeat Models
Witt Thanom,Robert N. K. Loh
Journal of Systemics, Cybernetics and Informatics , 2011,
Abstract: This paper presents a novel application of nonlinear control theory to heartbeat models. Existing heartbeat models are investigated and modified by incorporating the control input as a pacemaker to provide the control channel. A nonlinear feedback linearization technique is applied to force the output of the systems to generate artificial electrocardiogram (ECG) signal using discrete data as the reference inputs. The synthetic ECG may serve as a flexible signal source to assess the effectiveness of a diagnostic ECG signal-processing device.
Strength, But Not Direction, of Handedness Is Related to Height  [PDF]
Ruth E. Propper, Tad T. Brunye, Karly Hrank, Sean E. McGraw
Open Journal of Medical Psychology (OJMP) , 2013, DOI: 10.4236/ojmp.2013.24025
Abstract: Left-handers are reputed to be shorter than right-handers. However, previous research has confounded handedness direction (left-versus right-handedness) with handedness strength (consistency with which one hand is chosen across a variety of tasks; consistent-versus inconsistent-handedness). Here, we support a relationship between handedness strength, but not direction, and stature, with increasing inconsistent-handedness associated with increasing self-reported height.
Handedness and Lateralization of the Brain  [cached]
Parvaneh Khosravizadeh,Shohreh Teimournezhad
Brain. Broad Research in Artificial Intelligence and Neuroscience , 2011,
Abstract: The present study is a review of the key concepts in relation to the nature of handedness and in line with that, the phenomenon of brain lateralization. To this end, a number of articles have been overviewed and the critical concepts such as handedness and its main features, the theoretical bases for this phenomenon, the nature and functions of lateralization, and the relationship between these two concepts have been shed light on for a better understanding. Finally, the general differences between the left-handers vs. right-handers have been drawn into consideration.
Handedness and Lateralization of the Brain  [cached]
Parvaneh Khosravizadeh,Shohreh Teimournezhad
Brain. Broad Research in Artificial Intelligence and Neuroscience , 2011,
Abstract: The present study is a review of the key concepts in relation to the nature of handedness and in line with that, the phenomenon of brain lateralization. To this end, a number of articles have been overviewed and the critical concepts such as handedness and its main features, the theoretical bases for this phenomenon, the nature and functions of lateralization, and the relationship between these two concepts have been shed light on for a better understanding. Finally, the general differences between the left-handers vs. right-handers have been drawn into consideration.
Multifractality in Human Heartbeat Dynamics  [PDF]
Plamen Ch. Ivanov,Luís A. Nunes Amaral,Ary L. Goldberger,Shlomo Havlin,Michael G. Rosenblum,Zbigniew Struzik,H. Eugene Stanley
Quantitative Biology , 1999, DOI: 10.1038/20924
Abstract: Recent evidence suggests that physiological signals under healthy conditions may have a fractal temporal structure. We investigate the possibility that time series generated by certain physiological control systems may be members of a special class of complex processes, termed multifractal, which require a large number of exponents to characterize their scaling properties. We report on evidence for multifractality in a biological dynamical system --- the healthy human heartbeat. Further, we show that the multifractal character and nonlinear properties of the healthy heart rate are encoded in the Fourier phases. We uncover a loss of multifractality for a life-threatening condition, congestive heart failure.
Left-handedness and health  [PDF]
Milenkovi? Sanja,Belojevi? Goran,Kocijan?i? Radojka
Srpski Arhiv za Celokupno Lekarstvo , 2010, DOI: 10.2298/sarh1006387m
Abstract: Hand dominance is defined as a proneness to use one hand rather than another in performing the majority of activities and this is the most obvious example of cerebral lateralization and an exclusive human characteristic. Left-handed people comprise 6-14% of the total population, while in Serbia, this percentage is 5-10%, moving from undeveloped to developed environments, where a socio-cultural pressure is less present. There is no agreement between investigators who in fact may be considered a left-handed person, about the percentage of left-handers in the population and about the etiology of left-handedness. In the scientific literature left-handedness has been related to health disorders (spine deformities, immunological disorders, migraine, neurosis, depressive psychosis, schizophrenia, insomnia, homosexuality, diabetes mellitus, arterial hypertension, sleep apnea, enuresis nocturna and Down Syndrome), developmental disorders (autism, dislexia and sttutering) and traumatism. The most reliable scientific evidences have been published about the relationship between left-handedness and spinal deformities in school children in puberty and with traumatism in general population. The controversy of other results in up-to-now investigations of health aspects of left-handedness may partly be explained by a scientific disagreement whether writing with the left hand is a sufficient criterium for left-handedness, or is it necessary to investigate other parameters for laterality assessment. Explanation of health aspects of left-handedness is dominantly based on Geschwind-Galaburda model about 'anomalous' cerebral domination, as a consequence of hormonal disbalance. .
ASYMMETRICAL TONSILS
M. Musharaf Baig
The Professional Medical Journal , 1998,
Abstract: In this study, the different causes of theasymmetrical tonsils are ascertained withhitopathological examination. Tonsillar surfacebacteriological examination and hitopathologicalpicture are also compared.There is no correlation between tonsillar surfacebacteriology and histopathological examinationdone after tonsillectomy. While the chronictonsillitis (non-specific) is the commonest cause,tuberculosis of the tonsils is not uncommon,presenting as asymmetrical tonsils, in Pakistan.
PCSK6 VNTR Polymorphism Is Associated with Degree of Handedness but Not Direction of Handedness  [PDF]
Larissa Arning, Sebastian Ocklenburg, Stefanie Schulz, Vanessa Ness, Wanda M. Gerding, Jan G. Hengstler, Michael Falkenstein, J?rg T. Epplen, Onur Güntürkün, Christian Beste
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0067251
Abstract: Although the left and right human cerebral hemispheres differ both functionally and anatomically, the mechanisms that underlie the establishment of these hemispheric specializations, as well as their physiological and behavioral implications, remain largely unknown. Since cerebral asymmetry is strongly correlated with handedness, and handedness is assumed to be influenced by a number of genetic and environmental factors, we performed an association study of LRRTM1 rs6733871 and a number of polymorphisms in PCSK6 and different aspects of handedness assessed with the Edinburgh handedness inventory in a sample of unrelated healthy adults (n = 1113). An intronic 33bp variable-number tandem repeat (VNTR) polymorphism in PCSK6 (rs10523972) shows a significant association (significance threshold: p<0.0025, adjusted for multiple comparisons) with a handedness category comparison (P = 0.0005) and degree of handedness (P = 0.001). These results provide further evidence for the role of PCSK6 as candidate for involvement in the biological mechanisms that underlie the establishment of normal brain lateralization and thus handedness and support the assumption that the degree of handedness, instead the direction, may be the more appropriate indicator of cerebral organization.
Left and right handedness of fermions and bosons  [PDF]
Norma Mankoc Borstnik,Anamarija Borstnik
Physics , 1997, DOI: 10.1088/0954-3899/24/5/005
Abstract: It is shown, by using Grassmann space to describe the internal degrees of freedom of fermions and bosons, that the Weyl like equation exists not only for massless fermions but also for massless gauge bosons. The corresponding states have well defined helicity and handedness. It is shown that spinors and gauge bosons of the same handedness only interact.
An overview of human handedness in twins  [PDF]
Syuichi Ooki
Frontiers in Psychology , 2014, DOI: 10.3389/fpsyg.2014.00010
Abstract: There has been a long-standing debate on the complex correlation between the development of human hand preference and brain lateralization. Handedness, used as a proxy for cerebral lateralization, is a topic of considerable importance because of its potential to reveal the mechanisms of the underlying pathophysiology of problems related to brain development or cognitive systems. Twin studies, which represent an important method of research in human genetics, would provide valuable suggestions to the studies on the relationship between lateralization and cognitive systems. Many studies have been performed using twin subjects; however, the results are inconsistent, partly because of sample size, background assumptions, data limits or inaccuracies, incorrect zygosity classification and/or lack of birth histories. In summary, within the long history and large number of twin studies performed on handedness, a surprisingly large number of controversial findings have been reported, suggesting the complicated nature of this phenotype. In this mini review, the wide variety of twin studies on human handedness performed to date are introduced.
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