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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Koji Sakai
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DOI:10.17265/2159-5542/2017.07.001
Affiliation(s)
Kyoto Koka Women’s University, Kyoto, Japan
ABSTRACT
This study reviewed the
literature regarding capacity limitation in processing curvature from visual
perception to short-term visual memory (STVM) for a single curved contour with
multiple convex parts. Capacity limitation was defined in terms of both
set-size effects and decay with a retention interval. The results of
psychophysical experiments and simulations involving signal detection theory
indicated that visual perception exhibited some capacity limitation, which was
caused by attentional allocation rather than sensory activation. In contrast,
both iconic memory and STVM showed entirely limited capacity. Decay in STVM
lasted for up to a minute and was reduced via an increase in the duration of
stimulus presentation. Variance in represented stimulus values was shown to cause
STVM decay. Decisional confusion, rather than capacity limitation in perception
and STVM, was a primary factor in the deterioration of recognition of complex
curved contours. Only one contour could be retained in STVM with very high
fidelity, but at least four objects could be retained in STVM with some degree
of fidelity. STVM appeared to exhibit little decay for a simple curved contour
with four convex parts.
KEYWORDS
capacity limitation, short-term visual memory, visual perception, curved figure, curvature
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