A5088293095- EEG and Brain-Computer Interfaces
- Neural dynamics and brain function
- Neurological disorders and treatments
- Theoretical and Computational Physics
- Memory and Neural Mechanisms
- Solar and Space Plasma Dynamics
- Atomic and Molecular Physics
- Neural and Behavioral Psychology Studies
- Neuroscience and Neural Engineering
- Relativity and Gravitational Theory
- Parkinson's Disease Mechanisms and Treatments
- Geophysics and Gravity Measurements
- Functional Brain Connectivity Studies
- History and Developments in Astronomy
- Cerebral Palsy and Movement Disorders
- Motor Control and Adaptation
- Opinion Dynamics and Social Influence
- Astronomical Observations and Instrumentation
- Big Data and Business Intelligence
- Autism Spectrum Disorder Research
- Visual perception and processing mechanisms
- Gaze Tracking and Assistive Technology
- Astronomy and Astrophysical Research
- Advanced MRI Techniques and Applications
- Scientific Measurement and Uncertainty Evaluation
University of California, San Diego
2014-2024
Autism Research Institute
2019
Neural Analytics (United States)
2016
UC San Diego Health System
2016
University of California, Berkeley
2011
Torrey Pines Institute For Molecular Studies
2010
University of California, Irvine
2004-2005
King's College London
2004
Oberlin College
1972-1988
Carnegie Institution for Science
1983
Recoil-free resonant absorption of the 14.4-keV $\ensuremath{\gamma}$ ray in ${\mathrm{Fe}}^{57}$ has been employed to measure effect gravity over a 75-ft vertical path Jefferson Laboratory, an improved version experiment Pound and Rebka. A ${\mathrm{Co}}^{57}$ source, initially 1.25 Ci, large-windowed proportional counters, enriched absorber foil 15 in. diameter permitted much increased counting rate. The employment temperature-regulated ovens for source absorbers redesigned monitor system...
Received 24 September 1964DOI:https://doi.org/10.1103/PhysRevLett.13.539©1964 American Physical Society
Abstract Recording neural activity during neurosurgical interventions is an invaluable tool for both improving patient outcomes and advancing our understanding of mechanisms organization. However, increasing clinical electrodes' signal‐to‐noise spatial specificity requires overcoming substantial physical barriers due to the compromised metal electrochemical interface properties. The properties poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) based interfaces surpass those...
The red shift of the solar potassium absorption line at 7699 \AA{} has been measured by means an atomic-beam resonance-scattering technique. center disk, corrected for Earth's motion, is ${(\ensuremath{\Delta}\ensuremath{\lambda})}_{\mathrm{exp}}=(1.01\ifmmode\pm\else\textpm\fi{}0.06){(\ensuremath{\Delta}\ensuremath{\lambda})}_{\mathrm{theor}}$, where theoretical value, based on principle equivalence, 16.3 m\AA{}. Further data show negligible center-to-limb wavelength variation this line.
Intracellular molecular motor-driven transport is essential for such diverse processes as mitosis, neuronal function, and mitochondrial transport. Whereas there have been in vitro studies of how motors function at the single-molecule level, vivo structure filamentary networks, effectively use networks transportation lacking. We investigate combined system myosin-V plus actin filaments used to pigment granules Xenopus melanophores. Experimentally, we characterize both filament network, this...
To sustain successful behavior in dynamic environments, active organisms must be able to learn from the consequences of their actions and predict action outcomes. One most important discoveries systems neuroscience over last 15 years has been about key role neurotransmitter dopamine mediating such behavior. Dopamine cell firing was found encode differences between expected obtained outcomes actions. Although activity cells does not specify movements themselves, a recent study humans...
Survival depends on successfully foraging for food, which evolution has selected diverse behaviors in different species. Humans forage not only but also information. We decide where to look over 170,000 times per day, approximately three wakeful second. The frequency of these saccadic eye movements belies the complexity underlying each individual choice. Experience factors into choice and can be invoked rapidly redirect gaze a context task-appropriate manner. However, remarkably little is...
The future is uncertain because some forthcoming events are unpredictable and also our ability to foresee the myriad consequences of own actions limited. Here we studied how humans select under such extrinsic intrinsic uncertainty, in view an exponentially expanding number prospects on a branching multivalued visual stimulus. A triangular grid disks different sizes scrolled down touchscreen at variable speed. larger represented rewards. task was maximize cumulative reward by touching one...
The atomic heats of thallium have been measured in the liquid helium temperature range. In normal state heat varies with according to form: ${C}_{n}=\ensuremath{\gamma}T+464.4{(\frac{T}{\ensuremath{\theta}})}^{3}$ cal/mole deg which $\ensuremath{\gamma}=6.11\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ ${\mathrm{deg}}^{2}$ and $\ensuremath{\theta}=86.6\ifmmode^\circ\else\textdegree\fi{}$. superconducting state, at temperatures below $0.9{T}_{c}$, electronic specific obeys...
Spatial representations and walking speed in rodents are consistently related to the phase, frequency, and/or amplitude of θ rhythms hippocampal local field potentials. However, neuropsychological studies humans have emphasized importance parietal cortex for spatial navigation, efforts identify electrophysiological signs navigation been stymied by difficulty recording during free exploration complex environments. We resolved problem experimentally probed brain activity human participants who...
In the real world, learning often proceeds in an unsupervised manner without explicit instructions or feedback. this study, we employed experimental paradigm which subjects explored immersive virtual reality environment on each of two days. On day 1, implicitly learned location 39 objects fashion. 2, locations some were changed, and object recall performance was assessed found to vary across subjects. As prior work had shown that functional magnetic resonance imaging (fMRI) measures...
The relationship between movement kinematics and human brain activity is an important fundamental question for the development of neural prosthesis. peak velocity acceleration could best reflect feedforward-type movement; thus, it worthwhile to investigate them further. Most related studies focused on correlation during execution or imagery. However, result motor planning phase as well researchers have demonstrated that statistical correlations exist EEG using grand-average analysis. In this...
The neural dynamics underlying the coordination of spatially-directed limb and eye movements in humans is not well understood. Part difficulty has been a lack signal processing tools suitable for analysis nonstationary electroencephalographic (EEG) signals. Here, we use multivariate empirical mode decomposition (MEMD), data-driven approach that does employ predefined basis functions. High-density EEG, arm were synchronously recorded 10 subjects performing time-constrained reaching and/or...
Virtual reality (VR) allows precise control and manipulation of rich, dynamic stimuli that, when coupled with on-line motion capture neural monitoring, can provide a powerful means both understanding brain behavioral relations in the high dimensional world assessing treating variety disorders. Here we present system that combines state-of-the-art, fully immersive, 3D, multi-modal VR temporally aligned electroencephalographic (EEG) recordings. The is interactive across visual, auditory,...
The inability to maintain balance during varying postural control conditions can lead falls, a significant cause of mortality and serious injury among older adults. However, our understanding the underlying dynamical stochastic processes in human have not been fully explored. To further processes, we examine novel conceptual framework for studying using center pressure (COP) velocity autocorrelation function (COP-VAF) compare its results Stabilogram Diffusion Analysis (SDA). Eleven healthy...
Open source electrophysiology (ephys) recording systems have several advantages over commercial such as customization and affordability enabling more researchers to conduct ephys experiments. Notable open include Open-Ephys, NeuroRighter recently Willow, all of which high channel count (64+), scalability, advanced software develop on top of. However, little work has been done build an system that is clinic compatible, particularly in the operating room where acute human electrocorticography...
Dilute dipolar systems in three dimensions are expected to undergo a spin glass transition as the temperature decreases. Contrary this, we find from Wang-Landau Monte Carlo simulations that at low concentrations $x$, dipoles randomly placed on cubic lattice with interactions do not phase transition. We thermodynamic limit ``glass'' ${T}_{g}$ goes zero $1∕\sqrt{N}$, where $N$ is number of dipoles. The entropy per particle temperatures larger for lower $(x=4.5%)$ than higher $(x=20%)$.
The spin and hyperfine structure separation $\ensuremath{\Delta}\ensuremath{\nu}$, of 10-min ${\mathrm{N}}^{13}$ have been measured by the atomic-beam magnetic-resonance technique. machine was a modified focusing apparatus consisting six-pole A magnet, Goodman-type C an approximately uniform-gradient B magnet. This apparatus, which combines high transmission machines smaller detector area conventional machines, is described in detail. ${\mathrm{N}}^{13}$, form gaseous molecule, flushed...
A single target is hidden at a location chosen from predetermined probability distribution. Then, searcher must find second distribution which random search points are sampled such that the found in minimum number of trials. Here it will be shown if get very close to it, then best proportional square root regardless dimension. For Gaussian distribution, optimum approximately with standard deviation varies inversely how it. network where randomly samples nodes and looks for fixed along edges,...