Document Detail

More is not always better: adaptive gain control explains dissociation between perception and action.
MedLine Citation:
PMID:  23023292     Owner:  NLM     Status:  Publisher    
Moving objects generate motion information at different scales, which are processed in the visual system with a bank of spatiotemporal frequency channels. It is not known how the brain pools this information to reconstruct object speed and whether this pooling is generic or adaptive; that is, dependent on the behavioral task. We used rich textured motion stimuli of varying bandwidths to decipher how the human visual motion system computes object speed in different behavioral contexts. We found that, although a simple visuomotor behavior such as short-latency ocular following responses takes advantage of the full distribution of motion signals, perceptual speed discrimination is impaired for stimuli with large bandwidths. Such opposite dependencies can be explained by an adaptive gain control mechanism in which the divisive normalization pool is adjusted to meet the different constraints of perception and action.
Claudio Simoncini; Laurent U Perrinet; Anna Montagnini; Pascal Mamassian; Guillaume S Masson
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-30
Journal Detail:
Title:  Nature neuroscience     Volume:  -     ISSN:  1546-1726     ISO Abbreviation:  Nat. Neurosci.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-10-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9809671     Medline TA:  Nat Neurosci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Team InViBe, Institut de Neurosciences de la Timone, UMR 7289, CNRS and Aix-Marseille Université, Marseille, France.
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