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Search Results: 1 - 10 of 11261 matches for " Jonathan Bock "
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Transfer of Visuomotor Adaptation to Unpractised Hands and Sensory Modalities  [PDF]
Otmar Bock, Gerd Schmitz
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.412145
Abstract:

A recent model (Bock, 2013) predicts that sensorimotor adaptation, achieved while pointing at visual targets, will transfer fully to acoustic targets. The model further predicts that visual-to-acoustic transfer is not diminished even if the left and right arms have adapted to a different distortion. To scrutinize these predictions, we asked subjects to point at visual targets with their right hands under a +30 deg rotation of visual feedback (group “single”), or alternately, with their right hands under a +30 deg and with their left hands under a -30 deg rotation of visual feedback. Aftereffects were registered for each hand and for visual as well as acoustic targets, in counterbalanced order. We found that acoustic aftereffects were only about 66% of visual ones, which violates the first prediction and calls for an amendment of the model. We further found that acoustic aftereffects were of similar magnitude in both groups, which supports the second prediction. Finally, we observed an intermanual transfer of only about 29%. These findings suggest that unpractised acoustic inputs are weighted somewhat lower than practised visual ones, and that outputs to the unpractised left hand are weighted substantially lower than those to the practised right hand.

Dependence of Manual Grasping on the Behavioral Context: A Comparison between Arms and between Age Groups  [PDF]
Otmar Bock, Benjamin Baak
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.412144
Abstract:

We evaluated the kinematics and dynamics of grasping in a typical laboratory situation (L) and in a more everyday-like situation (E), using right-handed subjects. Performance was compared when young subjects used their right versus left arm, and when young versus old subjects used their left arm. As in our previous work, multiple differences emerged between parameter values in the two contexts, L and E. These context differences were, however, more pronounced for the left rather than for the right arm of young subjects, and more pronounced for the left arm of young rather than older subjects. We propose an explanation based on the differential involvement of the dorsal and ventral cortical processing stream in L and in E: The differential involvement would be accentuated for the left arm of young, but not for the left arm of older subjects.

Regular Transformation Groups Based on Fourier-Gauss Transforms
Maximilian Bock,Wolfgang Bock
Mathematics , 2015,
Abstract: We discuss different representations of the White noise spaces $(E)_{\beta}$, $0 \leq \beta < 1$ by introducing generalized Wick tensors. As an application we state a generalization of the Mehler formula for the Ornstein-Uhlenbeck semigroup.
Assessing Uncertainty and Risk in Public Sector Investment Projects  [PDF]
Katrin Bock, Stefan Trück
Technology and Investment (TI) , 2011, DOI: 10.4236/ti.2011.22011
Abstract: The feasibility and profitability of large investment projects are frequently subject to a partially or even fully undeterminable future, encompassing uncertainty and various types of risk. We investigate significant issues in the field of project appraisal techniques, including risks and uncertainties, appropriate risk analysis, project duration as well as the dependencies between (sub-) projects. The most common project appraisal techniques are examined addressing benefits and weaknesses of each technique. Furthermore, the practical use of the different techniques for the public sector is examined, exemplifying this with a small-scale analysis of the risk analysis procedures of the World Bank. Our finding suggest that in particular for the public sector, practical implementation of quantitative techniques like Monte Carlo simulation in the appraisal procedure of investment projects has not fully occurred to date. We strongly recommend further application of these approaches to the evaluation of processes and financial or economic risk factors in project appraisal of public sector institutions.
Energy-Minimizing Curve Fitting for High-Order Surface Mesh Generation  [PDF]
Karsten Bock, J?rg Stiller
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.521309
Abstract: We investigate different techniques for fitting Bézier curves to surfaces in context of high-order curvilinear mesh generation. Starting from distance-based least-squares fitting we develop an incremental algorithm, which incorporates approximations of stretch and bending energy. In the process, the algorithm reduces the energy weight in favor of accuracy, leading to an optimized set of sampling points. This energy-minimizing fitting strategy is applied to analytically defined as well as triangulated surfaces. The results confirm that the proposed method straightens and shortens the curves efficiently. Moreover the method preserves the accuracy and convergence behavior of distance-based fitting. Preliminary application to surface mesh generation shows a remarkable improvement of patch quality in high curvature regions.
Dual-task costs while walking increase in old age for some, but not for other tasks: an experimental study of healthy young and elderly persons
Otmar Bock
Journal of NeuroEngineering and Rehabilitation , 2008, DOI: 10.1186/1743-0003-5-27
Abstract: Healthy young and elderly subjects were tested under five different combinations of a walking and a non-walking task. The results were analysed jointly with those of a previous study from our lab, such that a total of 13 task combinations were evaluated. For each task combination and subject, we calculated the mean dual-task costs across both constituent tasks, and quantified ARD as the difference between those costs in elderly and in young subjects.An analysis of covariance yielded no significant effects of obstacle presence and overall task difficulty on ARD, but a highly significant effect of visual demand: non-walking tasks which required ongoing visual observation led to ARD of more than 8%, while those without such requirements led to near-zero ARD. We therefore concluded that the visual demand of the non-walking task is critical for the emergence of ARD while walking.Combinations of walking and concurrent visual observation, which are common in everyday life, may contribute towards disturbed gait and falls during daily activities in old age. Prevention and rehabilitation programs for seniors should therefore include training of such combinations.Human gait deteriorates in old age. Walking speed and the stability of the walking pattern decrease [1-3], and the incidence of falls increases dramatically: about 25% of the 70 year olds, 35% of the 75 year olds, and 50% of the over 80 year olds fall at least once per year [4-6]. Many of these falls don't result in physical injury, but they often have negative psychosocial consequences such as fear of falling, self-imposed inactivity, dependence on others [7], and ultimately, admittance into nursing homes [8]. To counteract this downward spiral, it is important to understand the reasons why locomotion is degraded in the elderly and, based on this understanding, to develop efficient prevention and rehabilitation programs.Previous studies proposed various explanations for gait impairments in old age, such as reduced se
Rese a de: "Afroargentinier und Nation. Konstruktionsweisen afroargentinischer Identit t im Buenos Aires des 19. Jahrhunderts" de Astrid Windus
Ulrike Bock
Latinoamérica. Revista de estudios Latinoamericanos , 2009,
Abstract:
La fundación intelectual de la República Federal de Alemania
Michel Bock
Revista de Derecho , 2002,
Abstract: A través de una visión crítica, Alemania logró la creación de unaidentidad a partir de cuatro dimensiones que permitieron llevar a caboseriamente la superación del pasado: la político-institucional, queimplicó el establecimiento de límites absolutos fundados en el derechonatural para evitar el totalitarismo y un sólido proceso de reconstruc-ción económica; la jurídico-personal, mediante un proceso de determi-nación de responsabilidades, la eliminación de la presencia nazi endiversas instancias y las reparaciones económicas correspondientes; labiográfico existencial a través de la apertura de la discusión acerca de laidentidad nacional, generalizando las categorías de culpa y conciencia;y la teórico espiritual consistente en una reeducación del pueblo alemán.Los resultados obtenidos se constituyen en un ejemplo para el mundo
An American ophthalmologist visits India
Bock Rudolf
Indian Journal of Ophthalmology , 1962,
Abstract:
Gegen eine Mystifizierung von Herrschaftsverh ltnissen Against the Mystification of the Relations of Domination
Ulla Bock
querelles-net , 2005,
Abstract: Die Beziehungen zwischen den Geschlechtern nehmen im Gesamtwerk Pierre Bourdieus keinen zentralen Raum ein. Gleichwohl ist er einer der wenigen Soziologen, die für die Geschlechterdifferenz einen Blick hatten, und das seit Beginn seiner Forschungst tigkeit in den 1960er Jahren. Doch erst in den 1990er Jahren begann er, das Thema systematischer zu analysieren, indem er seine überzeugung, dass die m nnliche Herrschaft eine Grundstruktur unserer Gesellschaft sei, zum Ausgangspunkt der vorliegenden Studie machte. Bourdieus Absicht ist es, gegen die fortgesetzte Mystifizierung von Herrschaftsverh ltnissen anzugehen, denn es g be – wie er schreibt – nichts Schlimmeres, als diese fortzuschreiben. The relationship between the sexes does not play a central role in Pierre Bourdieu’s overall work. Nevertheless, he is one of the few sociologists who has had an eye for gender differences. This has been the case since the beginning of his research activities in the 1960s. However, it was not until the 1990s that he began to systematically analyze the subject by making his conviction that male domination is the foundation of our society the starting point for the study at hand. Bourdieu’s intention is to fight against the mystification of the relations of domination because there would be nothing worse—as he himself writes—than to perpetuate these.
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