scholarly journals Local and global motion effects in interceptive timing

2013 ◽  
Vol 13 (9) ◽  
pp. 342-342
Author(s):  
J. Lopez-Moliner
Keyword(s):  
Global Motion ◽  
Interceptive Timing

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

scholarly journals Intellectual Homography Based Global Motion Estimation For Blocks In Video Coding

2019 ◽  
Vol 1362 ◽  
pp. 012066
Author(s):  
Sharon Elsa Mathew ◽  
S. Kokila
Keyword(s):  
Motion Estimation ◽  
Video Coding ◽  
Global Motion ◽  
Global Motion Estimation

The interaction of global motion and global form processing on the perception of implied motion: An equivalent noise approach

2021 ◽  
Vol 186 ◽  
pp. 34-40
Author(s):  
Mahesh R. Joshi ◽  
Anita J. Simmers ◽  
Seong T. Jeon
Keyword(s):  
Global Motion ◽  
Form Processing ◽  
Implied Motion ◽  
Global Form

scholarly journals Global motion compensated visual attention-based video watermarking

2016 ◽  
Vol 25 (6) ◽  
pp. 061624 ◽  
Author(s):  
Matthew Oakes ◽  
Deepayan Bhowmik ◽  
Charith Abhayaratne
Keyword(s):  
Visual Attention ◽  
Video Watermarking ◽  
Global Motion

Onset of Natural Convection from a Suddenly Heated Horizontal Cylinder

1980 ◽  
Vol 102 (4) ◽  
pp. 636-639 ◽  
Author(s):  
J. R. Parsons ◽  
J. C. Mulligan
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Heat Capacity ◽  
Natural Convection ◽  
Stability Analysis ◽  
Horizontal Cylinder ◽  
Finite Cylinder ◽  
Global Motion ◽  
Experimental Apparatus

A study of the onset of transient natural convection from a suddenly heated, horizontal cylinder of finite diameter is presented. The termination of the initial conductive and “locally” conuectiue heat transfer regime which precedes the onset of global natural convection is treated as a thermal stability phenomenon. An analysis is presented wherein the effects of finite cylinder diameter, cylinder heat capacity, and cylinder thermal conductivity are included in calculations of the convective delay time. A simple experimental apparatus is described and data presented. The thermal stability analysis is confirmed experimentally and data is presented which indicates localized natural convection prior to global motion.

scholarly journals The role of cortical area V5/MT+ in speed-tuned directional anisotropies in global motion perception

2007 ◽  
Vol 47 (7) ◽  
pp. 887-898 ◽  
Author(s):  
Deborah Giaschi ◽  
Amy Zwicker ◽  
Simon Au Young ◽  
Bruce Bjornson
Keyword(s):  
Motion Perception ◽  
Cortical Area ◽  
Global Motion
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