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Search Results: 1 - 10 of 100208 matches for " Antonio Maria Lapenta "
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Functional Magnetic Resonance Imaging Demonstrates That Hypnosis Is Conscious and Voluntary  [PDF]
Edoardo Casiglia, Francesco Finatti, Federica Gasparotti, Maria Rosaria Stabile, Micaela Mitolo, Federica Albertini, Antonio M. Lapenta, Enrico Facco, Valérie Tikhonoff, Annalena Venneri
Psychology (PSYCH) , 2018, DOI: 10.4236/psych.2018.97095
Abstract: Hypnosis is a condition of modified consciousness (monoideism) resulting from a mental representation able to produce psychological and physical effects. The general belief is that hypnosis is conscious and voluntary, but the practical demonstration of this hypothesis is far to be demonstrated. Twenty healthy highly hypnotizable volunteers were studied during through functional magnetic resonance imaging during a task. The task was necessary because functional magnetic resonance imaging gives no interesting results in neutral hypnosis. During the hypnotic task, the prefrontal dorso-lateral cortex, genual cortex, dorsal anterior cingulate cortex, and orbital portion of the inferior frontal convolution (i.e. the Broadmann areas 9, 25, 32 and 47) were activated. Such areas are associated to egoic consciousness and voluntary processes. The results show that the hypothesis that hypnosis is conscious and voluntary is correct.
Granone’s Plastic Monoideism Demonstrated by Functional Magnetic Resonance Imaging (fMRI)  [PDF]
Edoardo Casiglia, Francesco Finatti, Valérie Tikhonoff, Maria R. Stabile, Micaela Mitolo, Federica Gasparotti, Federica Albertini, Antonio M. Lapenta, Annalena Venneri
Psychology (PSYCH) , 2019, DOI: 10.4236/psych.2019.104030
Abstract: Plastic monoideism is the supposed basis of hypnosis, but has never been experimentally demonstrated. The aim of the paper presented herein is to demonstrate that plastic monoideism exists and can be put in evidence by functional magnetic resonance (fMRI). To this aim, fMRI brain areas activation was examined in 20 highly hypnotizable young participants during a task represented by hypnotic analgesia. Inhibition of pain transmission from periphery to brain cortex was demonstrated during hypnotic analgesia by lack of activation of central somatosensory areas. At the same time, the Brodmann areas 9, 25, 32 and 47 were highly activated. This indicates that during a hypnotic task the iper-activity of certain brain areas inhibits the other ones. This is just, for the neurobiologist, what plastic monoideism is for the clinic hypnotist. The hyper-activated areas represent the physiological basis of the monoideism, which was therefore confirmed by brain imaging.
Experimental Approach to the Transmission of Information in Hypnosis  [PDF]
Edoardo Casiglia, Federica Albertini, Valérie Tikhonoff, Federica Gasparotti, Jacopo Favaro, Francesco Finatti, Panagiota Rempelou, Antonio Maria Lapenta, Paolo Spinella
Psychology (PSYCH) , 2018, DOI: 10.4236/psych.2018.91001
Abstract: The means by which information can be transmitted in hypnosis are debated. Aim of this pilot study was to induce and maintain hypnosis without the hypnotist and the subject being in the same room. In other words, we wanted to clarify, using measurable outcomes, if the hypnotic message could be conveyed through an electronic device. We studied 6 young healthy highly hypnotizable volunteers. After a session aimed at creating the rapport, each participant underwent an experimental session consisting in the execution of a cold pressor test (CTP) in basal awake condition, during hypnotic focused analgesia in the presence of the hypnotist (HFA-P) and during hypnotic focused analgesia suggested via transceiver (HFA-R). Cardiovascular monitoring was performed throughout the session. Perceived pain intensity and hemodynamic parameters during the CPT (baseline, 1st minute, end of the test) in the three phases of the experimental session were compared with paired t-test. During both HFA-P and HFA-R, perceived pain was nullified. The times of permanence in icy water significantly increased in comparison to non-hypnotic condition by 369.2% in HFA-P and by 394.3% in HFA-R. The systolic blood pressure × heart rate product increased in non-hypnotic conditions (+27.8%, p < 0.01, at the 1st minute; +35.3%, p = 0.01, at the end) but not during HFA-P (-1% and -0.2%, NS) or HFA-R (+7.3% and -1.6%, NS). In conclusion, hypnosis induced and maintained via transceiver was equivalent to that in the presence of the hypnotist. The hypnotic information therefore turned out to be more important than the means chosen to transmit it.
Self-Feeding Turbulent Magnetic Reconnection on Macroscopic Scales
Giovanni Lapenta
Physics , 2008, DOI: 10.1103/PhysRevLett.100.235001
Abstract: Within a MHD approach we find magnetic reconnection to progress in two entirely different ways. The first is well-known: the laminar Sweet-Parker process. But a second, completely different and chaotic reconnection process is possible. This regime has properties of immediate practical relevance: i) it is much faster, developing on scales of the order of the Alfv\'en time, and ii) the areas of reconnection become distributed chaotically over a macroscopic region. The onset of the faster process is the formation of closed circulation patterns where the jets going out of the reconnection regions turn around and forces their way back in, carrying along copious amounts of magnetic flux.
The algorithms of the implicit moment method for plasma simulation
Giovanni Lapenta
Physics , 2008,
Abstract: We discuss the fundamentals of the implicit moment method for Particle In Cell (PIC) simulation as presently implemented in the CELESTE3D code. We present the method in its fully electromagnetic and fully kinetic version. The application of the method is to problems with multiple temporal and spatial scales, common in all space, astrophysical and laboratory plasmas.
Space Weather Prediction with Exascale Computing
Giovanni Lapenta
Physics , 2011,
Abstract: Space weather refers to conditions on the Sun, in the interplanetary space and in the Earth space environment that can influence the performance and reliability of space-borne and ground-based technological systems and can endanger human life or health. Adverse conditions in the space environment can cause disruption of satellite operations, communications, navigation, and electric power distribution grids, leading to a variety of socioeconomic losses. The conditions in space are also linked to the Earth climate. The activity of the Sun affects the total amount of heat and light reaching the Earth and the amount of cosmic rays arriving in the atmosphere, a phenomenon linked with the amount of cloud cover and precipitation. Given these great impacts on society, space weather is attracting a growing attention and is the subject of international efforts worldwide. We focus here on the steps necessary for achieving a true physics-based ability to predict the arrival and consequences of major space weather storms. Great disturbances in the space environment are common but their precise arrival and impact on human activities varies greatly. Simulating such a system is a grand- challenge, requiring computing resources at the limit of what is possible not only with current technology but also with the foreseeable future generations of super computers
Spontaneous large scale momentum exchange by microinstabilities: an analogy between tokamaks and space plasmas
Giovanni Lapenta
Physics , 2008,
Abstract: Based on a recent theory (Coppi, Nuclear Fusion, 42, 1, 2002) of spontaneous toroidal rotation in tokamaks (Lee et al, Phys Rev Lett, 91, 205003, 2003) and in astrophysical accretion disks, we propose that an analogous process could be at play also in the Earth space environment. We use fully kinetic PIC simulations to study the evolution of drift instabilities and we show that indeed a macroscopic velocity shear is generated spontaneously in the plasma. As in tokamaks, the microscopic fluctuations remain limited to the edge of the plasma channel but the momentum spreads over the whole macroscopic system.
Adaptive Multi-Dimensional Particle In Cell
Giovanni Lapenta
Physics , 2008,
Abstract: Kinetic Particle In Cell (PIC) methods can extend greatly their range of applicability if implicit time differencing and spatial adaption are used to address the wide range of time and length scales typical of plasmas. For implicit differencing, we refer the reader to our recent summary of the implicit moment PIC method implemented in our CELESTE3D code [G. Lapenta, Phys. Plasmas, 13, 055904 (2006)]. Instead, the present document deals with the issue of PIC spatial adaptation. Adapting a kinetic PIC code requires two tasks: adapting the grid description of the fields and moments and adapting the particle description of the distribution function. Below we address both issues. First, we describe how grid adaptation can be guided by appropriate measures of the local accuracy of the solution. Based on such information, grid adaptation can be obtained by moving grid points from regions of lesser interest to regions of higher interest or by adding and removing points. We discuss both strategies. Second, we describe how to adapt the local number of particles to reach the required statistical variance in the description of the particle population. Finally two typical applications of adaptive PIC are shown: collisionless shocks and charging of small bodies immersed in a plasma.
Soliton-Like Solutions of the Grad-Shafranov Equation
Giovanni Lapenta
Physics , 2003, DOI: 10.1103/PhysRevLett.90.135005
Abstract: A new class of soliton-like solutions is derived for the Grad-Shafranov (GS) equations. A mathematical analogy between the GS equation for MHD equilibria and the cubic Schr\"odinger (CS) equation for non-linear wave propagation forms the basis to derive the new class of solutions. The soliton-like solutions are considered for their possible relevance to astrophysics and solar physics problems. We discuss how a soliton-like solution can be generated by a repetitive process of magnetic arcade stretching and plasmoid formation induced by the differential rotation of the solar photosphere or of an accretion disk.
Notes on MV-modules over integral domains
Serafina Lapenta
Mathematics , 2015,
Abstract: An MV-module is an MV-algebra endowed with a scalar multiplication with scalars in a PMV-algebra (i.e. an MV-algebra endowed with a binary "ring-like" product). We investigate the class of semisimple MV-modules over a semisimple and totally ordered integral domain, and we prove an adjunction with a special class of linear spaces.
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