Document Detail

A detection theory account of change detection.
MedLine Citation:
PMID:  15669916     Owner:  NLM     Status:  MEDLINE    
Previous studies have suggested that visual short-term memory (VSTM) has a storage limit of approximately four items. However, the type of high-threshold (HT) model used to derive this estimate is based on a number of assumptions that have been criticized in other experimental paradigms (e.g., visual search). Here we report findings from nine experiments in which VSTM for color, spatial frequency, and orientation was modeled using a signal detection theory (SDT) approach. In Experiments 1-6, two arrays composed of multiple stimulus elements were presented for 100 ms with a 1500 ms ISI. Observers were asked to report in a yes/no fashion whether there was any difference between the first and second arrays, and to rate their confidence in their response on a 1-4 scale. In Experiments 1-3, only one stimulus element difference could occur (T = 1) while set size was varied. In Experiments 4-6, set size was fixed while the number of stimuli that might change was varied (T = 1, 2, 3, and 4). Three general models were tested against the receiver operating characteristics generated by the six experiments. In addition to the HT model, two SDT models were tried: one assuming summation of signals prior to a decision, the other using a max rule. In Experiments 7-9, observers were asked to directly report the relevant feature attribute of a stimulus presented 1500 ms previously, from an array of varying set size. Overall, the results suggest that observers encode stimuli independently and in parallel, and that performance is limited by internal noise, which is a function of set size.
Patrick Wilken; Wei Ji Ma
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.     Date:  2004-12-29
Journal Detail:
Title:  Journal of vision     Volume:  4     ISSN:  1534-7362     ISO Abbreviation:  J Vis     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2005-01-26     Completed Date:  2005-10-06     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  101147197     Medline TA:  J Vis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1120-35     Citation Subset:  IM    
Division of Biology, California Institute of Technology, Pasadena, CA, USA.
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MeSH Terms
Color Perception / physiology*
Memory, Short-Term / physiology
Orientation / physiology*
Signal Detection, Psychological / physiology*
Space Perception / physiology*

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