Results 31 to 40 of about 2,320,333 (291)

From wormhole to time machine: Comments on Hawking's Chronology Protection Conjecture [PDF]

, 1992
The recent interest in ``time machines'' has been largely fueled by the apparent ease with which such systems may be formed in general relativity, given relatively benign initial conditions such as the existence of traversable wormholes or of infinite ...
D. Giulini, F. Echeverria, F. J. Tipler, F. J. Tipler, G. Klinkhammer, G. T. Horowitz, G. W. Gibbons, H. Everett, J. Friedman, J. Friedman, J. R. Gott III, K. Gödel, K. I. Macrae, M. M. Nieto, M. S. Morris, M. S. Morris, M. Visser, M. Visser, M. Visser, M. Visser, M. Visser, M. Visser, Matt Visser, N. D. Birrell, R. M. Wald, R. P. Geroch, R. Penrose, S. A. Fulling, S. Deser, S. M. Carrol, S. W. Hawking, S. W. Hawking, S. W. Kim, U. Yurtsever, U. Yurtsever, U. Yurtsever, V. P. Frolov   +36 more
core   +3 more sources

Psychomotor Retardation, Attention Deficit and Executive Dysfunctional in Young Non-hospitalised Un-medicated Non-psychotic Unipolar Depression Patients [PDF]

Journal of Clinical and Diagnostic Research, 2014
Background: Neuropsychological deficits have been reported in patients with Major Depressive Disorder (MDD) during an acute episode. The reaction time gives an idea about integrity and the processing ability of central nervous system.
Kamini Ramdas Ilamkar
doaj   +1 more source

Intra-individual reaction time variability and all-cause mortality over 17 years: A community-based cohort study [PDF]

, 2013
Background: very few studies have examined the association between intra-individual reaction time variability and subsequent mortality. Furthermore, the ability of simple measures of variability to predict mortality has not been compared with more ...
A. J. Mackinnon, Anstey, Batterham, Bellgrove, Bruhn, Bunce, Bunce, Bunce, Bunce, Bunce, CHRISTENSEN, Christensen, D. Bunce, Deary, Deeg, Der, der Wiel, Feldman, Folstein, Frederiksen, Goldberg, H. Christensen, Hultsch, Li, Macdonald, MacDonald, P. J. Batterham, Schulz, Shipley, Strauss   +29 more
core   +1 more source

Complexity of central processing in simple and choice multilimb reaction-time tasks. [PDF]

PLoS ONE, 2014
The default mode of the motor system is a coupling between limbs. However, in some movements, a decoupling is required and thus calls for selection and facilitation/inhibition processes.
Matthieu P Boisgontier, George F Wittenberg, Hakuei Fujiyama, Oron Levin, Stephan P Swinnen   +4 more
doaj   +1 more source

Millisecond accuracy video display using OpenGL under Linux [PDF]

, 2006
To measure people’s reaction times to the nearest millisecond, it is necessary to know exactly when a stimulus is displayed. This article describes how to display stimuli with millisecond accuracy on a normal CRT monitor, using a PC running Linux.
A. Nye, B. Myors, B. Myors, J.-L. Tsai, M. Woo, N. Stewart, Neil Stewart, R. [E.] Graves, R. E. Graves, R. P. Plant, S. A. Finney, W. J. MacInnes   +11 more
core   +2 more sources

Effect of glare on simple reaction time

Journal of the Optical Society of America A, 2008
We systematized the study of the effect of glare on reaction time (RT), for visual conditions similar to the ones found during night driving: Mesopic range of adaptation (0.14 cd/m2), glare levels of the order of those produced by car headlights (E(G)=15, 60 lx), suprathreshold luminance contrasts, and a variety of spatial frequencies covering the ...
Aguirre, Rolando Carlos, Barraza, Jose Fernando, Colombo, Elisa Margarita   +2 more
openaire   +3 more sources

Simple visual reaction time in badminton players: A comparative study

National Journal of Physiology, Pharmacy and Pharmacology, 2015
Background: Adequate sports activity improves health and physical development by increasing muscle strength, alertness, sensory development, muscle coordination, speed, strength, and stamina.
Sushil P Dube, Shreechakradhar U Mungal, Mukund B Kulkarni   +2 more
doaj   +1 more source

The Effect of Limb Weight Gain on Premotor and Motor Components of Simple and Discriminative Reaction Time in Young and Elderly Men [PDF]

رشد و یادگیری حرکتی ورزشی, 2015
The effect of weight and force is one of the most important factors to organize and perform reaction time (RT) tasks. The elderly are involved in this variable when they gain weight.
Ahmad Nikravan, Rasool Hemayat talab, Fazlollah Bagherzadeh   +2 more
doaj   +1 more source

Diffusion-Limited Coalescence with Finite Reaction Rates in One Dimension

, 1994
We study the diffusion-limited process $A+A\to A$ in one dimension, with finite reaction rates. We develop an approximation scheme based on the method of Inter-Particle Distribution Functions (IPDF), which was formerly used for the exact solution of the ...
, , ben-Avraham D, Ben-Naim E, Bramson M, Braunstein L, D Ben-Avraham, Dexin Zhong, Doering C R, Hoyuelos M, Kopelman R, McQuarrie D A, Torney D C, Zumofen G   +13 more
core   +2 more sources

Audio–visual Reaction Time in Different Age Groups in Normal Individuals: A Cross-sectional Study

Journal of the Scientific Society
Background: Reaction time (RT) is a simple yet sensitive measure of sensorimotor and cognitive processing. As life expectancy increases, understanding age-related changes in RT is essential to assess the functional implications of aging on everyday tasks
Sanjivani Jadhav, Anupama Deepak, V Nagalakshmi, Savitri Siddanagoudra   +3 more
doaj   +1 more source