scholarly journals Are the optic flow and egocentric direction strategies for steering control during walking linearly combined?

2010 ◽  
Vol 10 (7) ◽  
pp. 1020-1020 ◽  
Author(s):  
H. Bruggeman ◽  
W. Warren
Keyword(s):  
Optic Flow ◽  
Steering Control ◽  
Egocentric Direction

scholarly journals Optic-flow and egocentric-direction strategies in walking: Central vs peripheral visual field

2005 ◽  
Vol 45 (25-26) ◽  
pp. 3117-3132 ◽  
Author(s):  
Kathleen A. Turano ◽  
Dylan Yu ◽  
Lei Hao ◽  
John C. Hicks
Keyword(s):  
Visual Field ◽  
Optic Flow ◽  
Peripheral Visual Field ◽  
Egocentric Direction

scholarly journals Steering bends and changing lanes: The impact of optic flow and road edges on two point steering control

2018 ◽  
Vol 18 (9) ◽  
pp. 14 ◽  
Author(s):  
Yuki Okafuji ◽  
Callum David Mole ◽  
Natasha Merat ◽  
Takanori Fukao ◽  
Yasuyoshi Yokokohji ◽  
...  
Keyword(s):  
Optic Flow ◽  
Steering Control ◽  
The Impact

scholarly journals The need for speed: global optic flow speed influences steering

2016 ◽  
Vol 3 (5) ◽  
pp. 160096 ◽  
Author(s):  
Georgios K. Kountouriotis ◽  
Callum D. Mole ◽  
Natasha Merat ◽  
Richard M. Wilkie
Keyword(s):  
Optic Flow ◽  
Ground Plane ◽  
Visual Fields ◽  
Flow Speed ◽  
Sufficient Information ◽  
Global Flow ◽  
Steering Control ◽  
Flow Speeds ◽  
Curved Paths ◽  
Perceptual Variable

How do animals follow demarcated paths? Different species are sensitive to optic flow and one control solution is to maintain the balance of flow symmetry across visual fields; however, it is unclear whether animals are sensitive to changes in asymmetries when steering along curved paths. Flow asymmetries can alter the global properties of flow (i.e. flow speed) which may also influence steering control. We tested humans steering curved paths in a virtual environment. The scene was manipulated so that the ground plane to either side of the demarcated path produced larger or smaller asymmetries in optic flow. Independent of asymmetries and the locomotor speed, the scene properties were altered to produce either faster or slower globally averaged flow speeds. Results showed that rather than being influenced by changes in flow asymmetry, steering responded to global flow speed. We conclude that the human brain performs global averaging of flow speed from across the scene and uses this signal as an input for steering control. This finding is surprising since the demarcated path provided sufficient information to steer, whereas global flow speed (by itself) did not. To explain these findings, existing models of steering must be modified to include a new perceptual variable: namely global optic flow speed.

Influence of optic flow on the control of heading and target egocentric direction during steering toward a goal

2014 ◽  
Vol 112 (4) ◽  
pp. 766-777 ◽  
Author(s):  
Li Li ◽  
Diederick C. Niehorster
Keyword(s):  
Optic Flow ◽  
Theoretic Approach ◽  
Global Flow ◽  
Response Delay ◽  
Control Precision ◽  
Direct Support ◽  
Flow Information ◽  
Control Response ◽  
Optic Flow Information ◽  
Egocentric Direction

Although previous studies have shown that people use both optic flow and target egocentric direction to walk or steer toward a goal, it remains in question how enriching the optic flow field affects the control of heading specified by optic flow and the control of target egocentric direction during goal-oriented locomotion. In the current study, we used a control-theoretic approach to separate the control response specific to these two cues in the visual control of steering toward a goal. The results showed that the addition of optic flow information (such as foreground motion and global flow) in the display improved the overall control precision, the amplitude, and the response delay of the control of heading. The amplitude and the response delay of the control of target egocentric direction were, however, not affected. The improvement in the control of heading with enriched optic flow displays was mirrored by an increase in the accuracy of heading perception. The findings provide direct support for the claim that people use the heading specified by optic flow as well as target egocentric direction to walk or steer toward a goal and suggest that the visual system does not internally weigh these two cues for goal-oriented locomotion control.

scholarly journals Optimal integration of heading specified by optic flow and target egocentric direction

2018 ◽  
Vol 18 (10) ◽  
pp. 1044
Author(s):  
Wei Sun ◽  
Zhenyu Zhu ◽  
Jing Chen ◽  
Guangtao Zhai ◽  
Michael Landy ◽  
...  
Keyword(s):  
Optic Flow ◽  
Optimal Integration ◽  
Egocentric Direction

Adjust Method of Nonlinear Gain in Four-Wheel Steering Control Using Sliding Mode Control

2009 ◽  
Vol 129 (7) ◽  
pp. 1389-1396 ◽  
Author(s):  
Misawa Kasahara ◽  
Yuki Kanai ◽  
Ryoko Shiraki ◽  
Yasuchika Mori
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Steering Control ◽  
Nonlinear Gain ◽  
Mode Control
Sign in / Sign up

Export Citation Format

Share Document