scholarly journals A Simple Reactive Obstacle Avoidance Algorithm and Its Application in Singapore Harbor

2010 ◽  
pp. 455-465 ◽  
Author(s):  
Tirthankar Bandyophadyay ◽  
Lynn Sarcione ◽  
Franz S. Hover
Keyword(s):  
Obstacle Avoidance

Autonomous Navigation and Obstacle Avoidance

2009 ◽  
Author(s):  
Jesse Berger ◽  
Cory Carson ◽  
Massood Towhidnejad ◽  
Richard Stansbury
Keyword(s):  
Obstacle Avoidance ◽  
Autonomous Navigation

AUV Experiments in Obstacle Avoidance

2005 ◽  
Author(s):  
D. P. Horner ◽  
A. J. Healey ◽  
S. P. Kragelund
Keyword(s):  
Obstacle Avoidance

Advances in Autonomous Obstacle Avoidance for Unmanned Surface Vehicles

2007 ◽  
Author(s):  
Jacoby Larson ◽  
Michael Bruch ◽  
Ryan Halterman ◽  
John Rogers ◽  
Robert Webster
Keyword(s):  
Obstacle Avoidance ◽  
Unmanned Surface Vehicles

scholarly journals “Real-time” obstacle avoidance in the absence of primary visual cortex

2009 ◽  
Vol 106 (37) ◽  
pp. 15996-16001 ◽  
Author(s):  
Christopher L. Striemer ◽  
Craig S. Chapman ◽  
Melvyn A. Goodale
Keyword(s):  
Visual Cortex ◽  
Real Time ◽  
Obstacle Avoidance ◽  
Primary Visual Cortex ◽  
Posterior Parietal Cortex ◽  
Dorsal Stream ◽  
Visual Pathways ◽  
Visual Stream ◽  
Reaching Task ◽  
Visual Inputs

When we reach toward objects, we easily avoid potential obstacles located in the workspace. Previous studies suggest that obstacle avoidance relies on mechanisms in the dorsal visual stream in the posterior parietal cortex. One fundamental question that remains unanswered is where the visual inputs to these dorsal-stream mechanisms are coming from. Here, we provide compelling evidence that these mechanisms can operate in “real-time” without direct input from primary visual cortex (V1). In our first experiment, we used a reaching task to demonstrate that an individual with a dense left visual field hemianopia after damage to V1 remained strikingly sensitive to the position of unseen static obstacles placed in his blind field. Importantly, in a second experiment, we showed that his sensitivity to the same obstacles in his blind field was abolished when a short 2-s delay (without vision) was introduced before reach onset. These findings have far-reaching implications, not only for our understanding of the time constraints under which different visual pathways operate, but also in relation to how these seemingly “primitive” subcortical visual pathways can control complex everyday behavior without recourse to conscious vision.

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