On the Global Motion of Viscous Compressible Barotropic Flows Subject to Large External Potential Forces and Vacuum

2015 ◽  
Vol 47 (2) ◽  
pp. 1121-1153 ◽  
Author(s):  
Jing Li ◽  
Jianwen Zhang ◽  
Junning Zhao
Keyword(s):  
External Potential ◽  
Global Motion ◽  
Potential Forces

Improving motion detection via anodal transcranial direct current stimulation

2020 ◽  
Vol 38 (5) ◽  
pp. 395-405
Author(s):  
Luca Battaglini ◽  
Federica Mena ◽  
Clara Casco
Keyword(s):  
Direct Current ◽  
Signal To Noise Ratio ◽  
Individual Performance ◽  
Coherent Motion ◽  
Motion Processing ◽  
Global Motion ◽  
Local Motion ◽  
Processing Efficiency ◽  
Temporal Area ◽  
Direct Current Stimulation

Background: To study motion perception, a stimulus consisting of a field of small, moving dots is often used. Generally, some of the dots coherently move in the same direction (signal) while the rest move randomly (noise). A percept of global coherent motion (CM) results when many different local motion signals are combined. CM computation is a complex process that requires the integrity of the middle-temporal area (MT/V5) and there is evidence that increasing the number of dots presented in the stimulus makes such computation more efficient. Objective: In this study, we explored whether anodal direct current stimulation (tDCS) over MT/V5 would increase individual performance in a CM task at a low signal-to-noise ratio (SNR, i.e. low percentage of coherent dots) and with a target consisting of a large number of moving dots (high dot numerosity, e.g. >250 dots) with respect to low dot numerosity (<60 dots), indicating that tDCS favour the integration of local motion signal into a single global percept (global motion). Method: Participants were asked to perform a CM detection task (two-interval forced-choice, 2IFC) while they received anodal, cathodal, or sham stimulation on three different days. Results: Our findings showed no effect of cathodal tDCS with respect to the sham condition. Instead, anodal tDCS improves performance, but mostly when dot numerosity is high (>400 dots) to promote efficient global motion processing. Conclusions: The present study suggests that tDCS may be used under appropriate stimulus conditions (low SNR and high dot numerosity) to boost the global motion processing efficiency, and may be useful to empower clinical protocols to treat visual deficits.

scholarly journals Coherent global motion in the absence of coherent velocity signals

2000 ◽  
Vol 10 (11) ◽  
pp. 679-682 ◽  
Author(s):  
John Ross ◽  
David R. Badcock ◽  
Anthony Hayes
Keyword(s):  
Global Motion

Comparing the solution of the time fractional Gross–Pitaevskii (FGP) equation with external potential by analytical and algebraic methods

SeMA Journal ◽  
2016 ◽  
Vol 73 (3) ◽  
pp. 201-212
Author(s):  
N. Taghizadeh ◽  
A. Ebadian ◽  
M. Najand Foumani ◽  
F. Farahrooz ◽  
A. A. Khajehnasiri
Keyword(s):  
External Potential ◽  
Algebraic Methods
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