Document Detail


Statistical learning induces discrete shifts in the allocation of working memory resources.
MedLine Citation:
PMID:  20718564     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Observers can voluntarily select which items are encoded into working memory, and the efficiency of this process strongly predicts memory capacity. Nevertheless, the present work suggests that voluntary intentions do not exclusively determine what is encoded into this online workspace. Observers indicated whether any items from a briefly stored sample display had changed. Unbeknown to observers, these changes were most likely to occur in a specific quadrant of the display (the dominant quadrant). Across 84 subjects and 5 groups of observers, change detection accuracy was significantly higher for items in the dominant quadrant, suggesting that memory encoding was biased towards the dominant quadrant. Only 9 of the 84 subjects were able to correctly specify the dominant quadrant when asked whether any location was more likely to contain the changed item, but more sensitive forced-choice procedures did reveal above-chance discrimination of the dominant quadrant. Nevertheless, because forced choice performance was unrelated to the size of the bias and no observer reported a biased encoding strategy, the bias was unlikely to depend on voluntary encoding strategies. The encoding bias was not due to a reduction in the response threshold for indicating changes in the dominant quadrant (Experiment 2). Finally, separate measures of the number and resolution of the representations in memory suggested that encoding was biased in a discrete slot-based fashion (Experiment 3). That is, although items in the dominant quadrant were more likely to be encoded into memory, mnemonic resolution for the favored items was not affected.
Authors:
Akina Umemoto; Miranda Scolari; Edward K Vogel; Edward Awh
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Journal of experimental psychology. Human perception and performance     Volume:  36     ISSN:  1939-1277     ISO Abbreviation:  J Exp Psychol Hum Percept Perform     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-07     Completed Date:  2011-04-14     Revised Date:  2014-09-13    
Medline Journal Info:
Nlm Unique ID:  7502589     Medline TA:  J Exp Psychol Hum Percept Perform     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1419-29     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Attention*
Awareness
Color Perception*
Concept Formation
Discrimination Learning*
Humans
Memory, Short-Term*
Orientation*
Pattern Recognition, Visual*
Probability Learning*
Reaction Time
Grant Support
ID/Acronym/Agency:
R01 MH087214/MH/NIMH NIH HHS; R01 MH087214-01/MH/NIMH NIH HHS; R01MH087214-01/MH/NIMH NIH HHS
Comments/Corrections

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