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Functional properties of visual and eye-movement-related neurons of area 7a were studied in alert behaving monkeys. Visual fixation (VF) neurons had selectivity in the direction and/or distance of gaze, signaling the spatial position. Visual tracking (VT) neurons had selectivity in the direction of movement, signaling the movement in space. Many passive(More)
A series of studies of visual orientation at blurring velocities is integrated ans summarized. Surfaces moving rapidly in depth were simulated and sensitivities of observers to depth-related geometric parameters of the resulting blur patterns, such as divergence and curvature, were measured. Examples of some ecological analyses of these parameters as(More)
The Newton MessagePad Personal Digital Assistant (PDA) is the first in a class of devices distinguished by their pen-based user interface, communications capability, small size, and low cost. A PDA operating system needs to support the simultaneous demands of user interface, applications, and communications. It must operate in an environment that has little(More)
Los Alamos National Laboratory (LANL) has deployed a 43-megapixel multi-panel immersive environment, La Cueva Grande (LCG), to be used in visualizing the terabytes of data produced by simulations. This paper briefly discusses some of the technical challenges encountered and overcome during the deployment of a 43-million pixel immersive visualization(More)
OBJECTIVE Sensitive, objective and easily applied methods for evaluating disease progression and response to therapy are needed for clinical trials in Duchenne muscular dystrophy (DMD). In this study, we evaluated whether electrical impedance myography (EIM) could serve this purpose. METHODS In this non-blinded study, 36 boys with DMD and 29 age-similar(More)
OBJECTIVE We assessed changes in quantitative muscle ultrasound data in boys with Duchenne muscular dystrophy (DMD) and healthy controls to determine if ultrasound can serve as a biomarker of disease progression. Two approaches were used: grey scale level (GSL), measured from the ultrasound image, and quantitative backscatter analysis (QBA) measured(More)
OBJECTIVE We sought to understand the alteration in the anisotropic, or direction dependent, character of muscle as measured by electrical impedance myography (EIM) in subjects with Duchenne muscular dystrophy (DMD) and its potential to serve as a biomarker of disease status. METHODS Thirty-six boys with DMD and 27 healthy controls were measured with EIM,(More)
Evaluation of radio frequency immunity test facilities based on the scattered field of a conductive sphere," Electronics andSEMIRAMIS: an asymmetrical bounded wave EMP simulator with a good confinement inside the transmission line," and engineering of a large shielded semi-anechoic chamber meeting the volumetric NSA requirements at 3 and 10 m transmission(More)