scholarly journals Multifocal VEP signal dependence on stimulus area

2005 ◽  
Vol 5 (8) ◽  
pp. 892-892
Author(s):  
J. M. Ales ◽  
T. Carney ◽  
S. A. Klein
Keyword(s):  
Stimulus Area ◽  
Multifocal Vep ◽  
Signal Dependence

Predicting the Scalp Potential Topography in the Multifocal VEP by fMRI

2009 ◽  
Vol 3 ◽  
Author(s):  
Strasburger Hans
Keyword(s):  
Multifocal Vep

Signal Dependence of Cross-Phase Modulation in WDM Systems

2000 ◽  
Vol 11 (2) ◽  
pp. 199-206 ◽  
Author(s):  
Lutz Rapp
Keyword(s):  
Phase Modulation ◽  
Cross Phase Modulation ◽  
Signal Dependence

scholarly journals Senescent changes in parafoveal color appearance: saturation as a function of stimulus area

2002 ◽  
Vol 19 (1) ◽  
pp. 208 ◽  
Author(s):  
Holger Knau ◽  
John S. Werner
Keyword(s):  
Color Appearance ◽  
Stimulus Area

Signal dependence of the phase-generated carrier method

2007 ◽  
Vol 46 (10) ◽  
pp. 105602 ◽  
Author(s):  
Kuang Wu
Keyword(s):  
Signal Dependence ◽  
Phase Generated Carrier

Effect of temporal sparseness and dichoptic presentation on multifocal visual evoked potentials

2005 ◽  
Vol 22 (1) ◽  
pp. 45-54 ◽  
Author(s):  
ANDREW C. JAMES ◽  
RASA RUSECKAITE ◽  
TED MADDESS
Keyword(s):  
Visual Field ◽  
Human Subjects ◽  
Signal To Noise ◽  
Recording Time ◽  
Contrast Gain ◽  
Upper Visual Field ◽  
Multifocal Vep ◽  
Normal Human ◽  
Time Decomposition ◽  
Peak Value

Multifocal VEP (mfVEP) responses were obtained from 13 normal human subjects for nine test conditions, covering three viewing conditions (dichoptic and left and right monocular), and three different temporal stimulation forms (rapid contrast reversal, rapid pattern pulse presentation, and slow pattern pulse presentation). The rapid contrast reversal stimulus had pseudorandomized reversals of checkerboards in each visual field region at a mean rate of 25 reversals/s, similar to most mfVEP studies to date. The rapid pattern pulse presentation had pseudorandomized presentations of a checkerboard for one frame, interspersed with uniform grey frames, with a mean rate of 25 presentations/s per region per eye. The slow pattern pulse stimulus had six presentations/s per region per eye. Recording time was 5.3 min/condition. For dichoptic presentation slow pattern pulse responses were 4.6 times larger in amplitude than the contrast reversal responses. Binocular suppression was greatest for the contrast reversal stimulus. Consideration of the signal-to-noise ratios indicated that to achieve a given level of reliability, slow pattern pulse stimuli would require half the recording time of contrast reversal stimuli for monocular viewing, and 0.4 times the recording time for dichoptically presented stimuli. About half the responses to the slow pattern pulse stimuli had peak value exceeding five times their estimated standard error. Responses were about 20% smaller in the upper visual field locations. Space–time decomposition showed that responses to slow pattern pulse were more consistent across visual field locations. We conclude that the pattern pulse stimuli, which we term temporally sparse, maintain the visual system in a high contrast gain state. This more than compensates for the smaller number of presentations in the run, and provides signal-to-noise advantages that may be valuable in clinical application.

Investigation of the photoacoustic signal dependence on laser power

2007 ◽  
Author(s):  
Jan Niemi ◽  
Torbjörn Löfqvist ◽  
Per Gren
Keyword(s):  
Laser Power ◽  
Photoacoustic Signal ◽  
Signal Dependence

Laser Signal Dependence on Artworks Surface Characteristics: A Study of Frescoes and Icons Samples

2006 ◽  
pp. 327-332
Author(s):  
E. Esposito ◽  
P. Castellini ◽  
N. Paone ◽  
E. P. Tomasini
Keyword(s):  
Surface Characteristics ◽  
Laser Signal ◽  
Signal Dependence

scholarly journals Multifocal VEP in children: its maturation and clinical application

2004 ◽  
Vol 88 (2) ◽  
pp. 226-232 ◽  
Author(s):  
C Balachandran
Keyword(s):  
Clinical Application ◽  
Multifocal Vep

Detecting Early to Mild Glaucomatous Damage: A Comparison of the Multifocal VEP and Automated Perimetry

2004 ◽  
Vol 45 (2) ◽  
pp. 492 ◽  
Author(s):  
Donald C. Hood ◽  
Phamornsak Thienprasiddhi ◽  
Vivienne C. Greenstein ◽  
Bryan J. Winn ◽  
Nitin Ohri ◽  
...  
Keyword(s):  
Automated Perimetry ◽  
Glaucomatous Damage ◽  
Multifocal Vep
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