10 research outputs found
Neurofeedback and creativity in interceptive human movement: a theoretical model for neurocybernetics based kinaesthetic multimodal learning agent
No full textMany sporting expertise demands a coordinated execution of movements to overcome the challenges. Challenges could be environmental or situational. The athlete's ability to respond is a function of both physical and mental states. Athletes with comparable physical conditionings succeed or fail depending on mental ability to respond. Sporting tasks such as baseball hitting, cricket batting etc. demands short intense concentration over a prolonged period of time. Performance involving these type of interceptive movement requires fast visual and motor processing. Brain imaging studies in athletes have demonstrated that the visual stimulation produces a coactivation of motor areas. We discuss a theoretical model of neurofeedback to track and enhance mental learning. This requires analysis of brain state data in real time. We present a comparative study of related methods with mathematical backgrounds. We also validate the algorithms on experimental example dataset. We conclude with the potential limitations on real-time application and a roadmap for improvement. We also present the experimental design protocol for planned data collection
Measuring brain signals to evaluate the role of creativity in interceptive human movement
No full textHuman movement involves executive control and cognition. Elite sports require development of this expertise together with the physical conditioning. This research explores the role of creativity in developing mental skills in sports from a computational neuroscience perspective. Future direction of the research will aim to study the role of creativity on performance in the case of cricket batting. Here we present a review of the methods and the preliminary results on brain source estimation analysis on a number of sample dataset. A roadmap for future theoretical and experimental evaluation procedure is discussed as well
Publisher's Note: Search for gravitational waves from binary black hole inspiral, merger, and ringdown
No full textThis paper was published online on 6 June 2011 with an omission in the Collaboration author list. S. Dwyer has been
added as of 12 April 2012. The Collaboration author list is incorrect in the printed version of the journal
Erratum: Search for gravitational waves from compact binary coalescence in LIGO and Virgo data from S5 and VSR1 (Physical Review D - Particles, Fields, Gravitation and Cosmology)
No full textThis paper was published online on 5 November 2010 with an omission in the Collaboration author list. S. Dwyer has
been added as of 12 April 2012. The Collaboration author list is incorrect in the printed version of the journal
Search for gravitational waves from binary black hole inspiral, merger, and ringdown
No full textWe present the first modeled search for gravitational waves using the complete binary black-hole gravitational waveform from inspiral through the merger and ringdown for binaries with negligible component spin. We searched approximately 2 years of LIGO data, taken between November 2005 and September 2007, for systems with component masses of 1-99M(circle dot) and total masses of 25-100M(circle dot). We did not detect any plausible gravitational-wave signals but we do place upper limits on the merger rate of binary black holes as a function of the component masses in this range. We constrain the rate of mergers for 19M(circle dot
All-sky search for gravitational-wave bursts in the first joint LIGO-GEO-Virgo run
No full textWe present results from an all-sky search for unmodeled gravitational-wave bursts in the data collected by the LIGO, GEO 600 and Virgo detectors between November 2006 and October 2007. The search is performed by three different analysis algorithms over the frequency band 50–6000 Hz. Data are analyzed for times with at least two of the four LIGO-Virgo detectors in coincident operation, with a total live time of 266 days. No events produced by the search algorithms survive the selection cuts. We set a frequentist upper limit on the rate of gravitational-wave bursts impinging on our network of detectors. When combined with the previous LIGO search of the data collected between November 2005 and November 2006, the upper limit on the rate of detectable gravitational-wave bursts in the 64–2048 Hz band is 2.0 events per year at 90% confidence. We also present event rate versus strength exclusion plots for several types of plausible burst waveforms. The sensitivity of the combined search is expressed in terms of the root-sum-squared strain amplitude for a variety of simulated waveforms and lies in the range 6×10[superscript -22] Hz[superscript -1/2] to 2×10[superscript -20 ] Hz[superscript -1/2]. This is the first untriggered burst search to use data from the LIGO and Virgo detectors together, and the most sensitive untriggered burst search performed so far.National Science FoundationScience and Technology Facilities Council, United KingdomAustralian Research CouncilIstituto Nazionale di Fisica Nucleare of ItalyMax Planck Society for the Advancement of ScienceState of Niedersachsen, GermanyInstitut National de Physique Nucléaire and de Physique des ParticulesAustralian Research CouncilCouncil of Scientific and Industrial Research of IndiaMEC (Spain)Conselleria d’Economia, Hisenda i Innovació of the Govern de les Illes BalearsFOM of the NetherlandsPolish Ministry of Science and Higher EducationFoundation for Polish ScienceRoyal Society, United KingdomScottish Funding CouncilScottish Universities Physics AllianceNational Aeronautics and Space AdministrationCarnegie TrustDavid and Lucile Packard FoundationAlfred P. Sloan FoundationResearch Corporatio
Search for gravitational waves associated with the August 2006 timing glitch of the Vela pulsar
No full textThe physical mechanisms responsible for pulsar timing glitches are thought to excite quasinormal mode oscillations in their parent neutron star that couple to gravitational-wave emission. In August 2006, a timing glitch was observed in the radio emission of PSR B0833-45, the Vela pulsar. At the time of the glitch, the two colocated Hanford gravitational-wave detectors of the Laser Interferometer Gravitational-wave observatory (LIGO) were operational and taking data as part of the fifth LIGO science run (S5). We present the first direct search for the gravitational-wave emission associated with oscillations of the fundamental quadrupole mode excited by a pulsar timing glitch. No gravitational-wave detection candidate was found. We place Bayesian 90% confidence upper limits of 6.3 x 10(-21) to 1.4 x 10(-20) on the peak intrinsic strain amplitude of gravitational-wave ring-down signals, depending on which spherical harmonic mode is excited. The corresponding range of energy upper limits is 5.0 x 10(44) to 1.3 x 10(45) erg
Search for gravitational waves from compact binary coalescence in LIGO and Virgo data from S5 and VSR1
No full textWe report the results of the first search for gravitational waves from compact binary coalescence using data from the Laser Interferometer Gravitational-Wave Observatory and Virgo detectors. Five months of data were collected during the Laser Interferometer Gravitational-Wave Observatory’s S5 and Virgo’s VSR1 science runs. The search focused on signals from binary mergers with a total mass between 2 and 35M⊙. No gravitational waves are identified. The cumulative 90%-confidence upper limits on the rate of compact binary coalescence are calculated for nonspinning binary neutron stars, black hole-neutron star systems, and binary black holes to be 8.7×10-3 yr-1 L10-1, 2.2×10-3 yr-1 L10-1, and 4.4×10-4 yr-1 L10-1, respectively, where L10 is 1010 times the blue solar luminosity. These upper limits are compared with astrophysical expectations.National Science Foundation (U.S.)United States. National Aeronautics and Space AdministrationCarnegie TrustLeverhulme TrustDavid & Lucile Packard FoundationAlfred P. Sloan FoundationResearch Corporatio
SEARCH FOR GRAVITATIONAL-WAVE INSPIRAL SIGNALS ASSOCIATED WITH SHORT GAMMA-RAY BURSTS DURING LIGO'S FIFTH AND VIRGO'S FIRST SCIENCE RUN
No full textProgenitor scenarios for short gamma-ray bursts (short GRBs) include coalescenses of two neutron stars or a neutron star and black hole, which would necessarily be accompanied by the emission of strong gravitational waves. We present a search for these known gravitational-wave signatures in temporal and directional coincidence with 22 GRBs that had sufficient gravitational-wave data available in multiple instruments during LIGO's fifth science run, S5, and Virgo's first science run, VSR1. We find no statistically significant gravitational-wave candidates within a [ - 5, + 1) s window around the trigger time of any GRB. Using the Wilcoxon-Mann-Whitney U-test, we find no evidence for an excess of weak gravitational-wave signals in our sample of GRBs. We exclude neutron star-black hole progenitors to a median 90% confidence exclusion distance of 6.7 Mpc
Search for gravitational wave bursts from six magnetars
No full textSoft gamma repeaters (SGRs) and anomalous X-ray pulsars (AXPs) are thought to be magnetars: neutron stars powered by extreme magnetic fields. These rare objects are characterized by repeated and sometimes spectacular gamma-ray bursts. The burst mechanism might involve crustal fractures and excitation of non-radial modes which would emit gravitational waves (GWs). We present the results of a search for GW bursts from six galactic magnetars that is sensitive to neutron star f-modes, thought to be the most efficient GW emitting oscillatory modes in compact stars. One of them, SGR 0501+4516, is likely similar to 1 kpc from Earth, an order of magnitude closer than magnetars targeted in previous GW searches. A second, AXP 1E 1547.0-5408, gave a burst with an estimated isotropic energy >10(44) erg which is comparable to the giant flares. We find no evidence of GWs associated with a sample of 1279 electromagnetic triggers from six magnetars occurring between 2006 November and 2009 June, in GW data from the LIGO, Virgo, and GEO600 detectors. Our lowest model-dependent GW emission energy upper limits for band-and time-limited white noise bursts in the detector sensitive band, and for f-mode ringdowns (at 1090 Hz), are 3.0 x 10(44)d(1)(2) erg and 1.4 x 10(47)d(1)(2) erg, respectively, where d(1) = d(0501)/1 kpc and d(0501) is the distance to SGR 0501+4516. These limits on GW emission from f-modes are an order of magnitude lower than any previous, and approach the range of electromagnetic energies seen in SGR giant flares for the first time
