Document Detail

Active gaze control improves optic flow-based segmentation and steering.
MedLine Citation:
PMID:  22719889     Owner:  NLM     Status:  MEDLINE    
An observer traversing an environment actively relocates gaze to fixate objects. Evidence suggests that gaze is frequently directed toward the center of an object considered as target but more likely toward the edges of an object that appears as an obstacle. We suggest that this difference in gaze might be motivated by specific patterns of optic flow that are generated by either fixating the center or edge of an object. To support our suggestion we derive an analytical model that shows: Tangentially fixating the outer surface of an obstacle leads to strong flow discontinuities that can be used for flow-based segmentation. Fixation of the target center while gaze and heading are locked without head-, body-, or eye-rotations gives rise to a symmetric expansion flow with its center at the point being approached, which facilitates steering toward a target. We conclude that gaze control incorporates ecological constraints to improve the robustness of steering and collision avoidance by actively generating flows appropriate to solve the task.
Florian Raudies; Ennio Mingolla; Heiko Neumann
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-06-14
Journal Detail:
Title:  PloS one     Volume:  7     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2012  
Date Detail:
Created Date:  2012-06-21     Completed Date:  2012-12-13     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e38446     Citation Subset:  IM    
Center of Excellence for Learning in Education, Science, and Technology, Boston University, Boston, Massachusetts, United States of America.
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MeSH Terms
Eye Movements*
Fixation, Ocular
Models, Theoretical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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