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| Research article summary (published 30 Dec 2001): |
A feature-segmentation model of short-term visual memory.
Full Abstract
A feature-segmentation model of short-term visual memory (STVM) for contours is proposed. Memory of the First stimulus is maintained until the second stimulus is observed. Three processes interact to determine the relationship between stimulus and response:
feature encoding, memory, and decision. Basic assumptions of the model are twofold:
(i) the STVM system divides a contour into convex parts at regions of concavity; and (ii) the value of each convex part represented in STVM is an independent Gaussian random variable. Simulation showed that the five-parameter fits give a good account of the effects of the four experimental variables. The model provides evidence that:
(i) contours are successfully encoded within 0.5 s exposure, regardless of pattern complexity; (ii) memory noise increases as a linear function of retention interval; (iii) the capacity of STVM, defined by pattern complexity (the degree that a pattern can be handled for several seconds with little loss), is about 4 convex parts; and (iv) the confusability contributing to the decision process is a primary factor in deteriorating recognition of complex figures. It is concluded that visually presented patterns can be retained in STVM with considerable precision for prolonged periods of time, though some loss of precision is inevitable.
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Author information
Author/s: Sakai, Koji (K); Inui, Toshio (T);
Affiliation: Department of Human Relations, Faculty of Human Relations, Kyoto Koka Women's College, Japan. rb064(-atsign-)gwm.koka.ac.jp
Journal and publication information
Publication Type: Journal Article
Journal: Perception (Perception), published in England. (Language: eng)
Reference: 2002-; vol 31 (issue 5) : pp 579-89
Dates: Created 2002/06/04; Completed 2002/06/25; Revised 2004/11/17;
PMID: 12044098, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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