Document Detail

Wayfinding on foot from information in retinal, not optical, flow.
MedLine Citation:
PMID:  1534347     Owner:  NLM     Status:  MEDLINE    
People find their way through cluttered environments with ease and without injury. How do they do it? Two approaches to wayfinding are considered: Differential motion parallax (DMP) is a retinal motion invariant of near and far objects moving against fixation; the information in optical flow (IOF) is a radial pattern of vectors, relying on decomposition of retinal flow. Evidence is presented that DMP guides wayfinding during natural gait, accounting for errors as well as correct responses. Evidence against IOF is also presented, and a space-time aliasing artifact that can contaminate IOF displays is explored. Finally, DMP and IOF are separated, showing they can yield different results in different environments. Thus, it is concluded that (a) DMP and IOF are different, (b) DMP and not IOF is used for wayfinding, (c) moving observers do not usually decompose retinal flow, and (d) optical flow may be a mathematical fiction with no psychological reality.
J E Cutting; K Springer; P A Braren; S H Johnson
Related Documents :
24850907 - Synergy between shear-induced migration and secondary flows on red blood cells transpor...
23973277 - Near-infrared spectroscopy to indicate selective shunt use during carotid endarterectomy.
6891097 - Panretinal photocoagulation and retinal oxygenation.
3190547 - Photochemical initiation of thrombosis. fluorescein angiographic, histologic, and ultra...
7723047 - Structure of the glomerular capillaries of the domestic chicken and desert quail.
16675937 - Risks, benefits, alternatives and indications of allogenic blood transfusions.
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of experimental psychology. General     Volume:  121     ISSN:  0096-3445     ISO Abbreviation:  J Exp Psychol Gen     Publication Date:  1992 Mar 
Date Detail:
Created Date:  1992-07-01     Completed Date:  1992-07-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7502587     Medline TA:  J Exp Psychol Gen     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  41-72     Citation Subset:  IM; S    
Department of Psychology, Cornell University, Ithaca 14853-7601.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Attention / physiology
Distance Perception / physiology
Gait / physiology
Motion Perception / physiology*
Orientation / physiology*
Reaction Time / physiology
Retina / physiology*
Social Environment*

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

Previous Document:  Some clotting factors in plasma during danazol therapy: free and total protein S, but not C4b-bindin...
Next Document:  General slowing alone cannot explain age-related search effects: reply to Cerella (1991)