Document Detail

Selective Influence of Working Memory Load on Exceptionally Slow Reaction Times.
MedLine Citation:
PMID:  25000446     Owner:  NLM     Status:  Publisher    
The rate of exceptionally slow reaction times (RTs), described by the long tail of the RT distribution, was found to be amplified in a variety of special populations with cognitive deficits (e.g., early-stage Alzheimer's disease, attention-deficit/hyperactivity disorder, low intelligence, elderly). Previous individual differences studies found high correlations between working memory (WM) and parameters that characterize the magnitude of the long-RT tail. However, the causal direction remains unknown. In 3 choice-reaction task experiments, we examined this relationship by directly manipulating WM availability. In Experiment 1, the stimulus-response rules were either arbitrary (WM demanding) or nonarbitrary. In Experiment 2, the arbitrary rules were either novel (demanding) or practiced. In Experiment 3, WM was loaded with either declarative (stimulus-stimulus) or procedural (stimulus-response) arbitrary rules. Using an ex-Gaussian model fitting, we found across all experiments that WM demands uniquely influenced the τ parameter, mostly responsible for the long-RT distribution tail. Evidence accumulation modeling of the choice process indicated that WM load had little influence on the decision process itself and primarily affected the duration of an exponentially distributed nondecision component, assumed to reflect the process of rule retrieval. Theoretical interpretations and implications are discussed. (PsycINFO Database Record (c) 2014 APA, all rights reserved).
Nitzan Shahar; Andrei R Teodorescu; Marius Usher; Maayan Pereg; Nachshon Meiran
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-7-7
Journal Detail:
Title:  Journal of experimental psychology. General     Volume:  -     ISSN:  1939-2222     ISO Abbreviation:  J Exp Psychol Gen     Publication Date:  2014 Jul 
Date Detail:
Created Date:  2014-7-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502587     Medline TA:  J Exp Psychol Gen     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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