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Media type:
E-Article
Title:
Limited Capacity for Contour Curvature in Iconic Memory
Contributor:
Sakai, Koji
Published:
SAGE Publications, 2006
Published in:
Perceptual and Motor Skills, 102 (2006) 3, Seite 611-631
Language:
English
DOI:
10.2466/pms.102.3.611-631
ISSN:
0031-5125;
1558-688X
Origination:
Footnote:
Description:
We measured the difference threshold for contour curvature in iconic memory by using the cued discrimination method. The study stimulus consisting of 2 to 6 curved contours was briefly presented in the fovea, followed by two lines as cues. Subjects discriminated the curvature of two cued curves. The cue delays were 0 msec. and 300 msec. in Exps. 1 and 2, respectively, and 50 msec. before the study offset in Exp. 3. Analysis of data from Exps. 1 and 2 showed that the Weber fraction rose monotonically with the increase in set size. Clear set-size effects indicate that iconic memory has a limited capacity. Moreover, clear set-size effect in Exp. 3 indicates that perception itself has a limited capacity. Larger set-size effects in Exp. 1 than in Exp. 3 suggest that iconic memory after perceptual process has limited capacity. These properties of iconic memory at threshold level are contradictory to the traditional view that iconic memory has a high capacity both at suprathreshold and categorical levels.