Document Detail

Connecting the Dots: Object Connectedness Deceives Perception but Not Movement Planning.
MedLine Citation:
PMID:  23765267     Owner:  NLM     Status:  Publisher    
The perceptual system parses complex scenes into discrete objects. Parsing is also required for planning visually guided movements when more than one potential target is present. To examine whether visual perception and motor planning use the same or different parsing strategies, we used the connectedness illusion, in which observers typically report seeing fewer targets if pairs of targets are connected by short lines. We found that despite this illusion, when observers are asked to make speeded reaches toward targets in such displays, their reaches are unaffected by the presence of the connecting lines. Instead, their movement plans, as revealed by their movement trajectories, are influenced by the number of potential targets irrespective of whether connecting lines are present or not. This suggests that scene parsing for perception depends on mechanisms that are distinct from those that allow observers to plan rapid and efficient target-directed movements in situations with multiple potential targets.
Jennifer L Milne; Craig S Chapman; Jason P Gallivan; Daniel K Wood; Jody C Culham; Melvyn A Goodale
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-6-13
Journal Detail:
Title:  Psychological science     Volume:  -     ISSN:  1467-9280     ISO Abbreviation:  Psychol Sci     Publication Date:  2013 Jun 
Date Detail:
Created Date:  2013-6-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9007542     Medline TA:  Psychol Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1The Brain and Mind Institute, The University of Western Ontario.
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